Site log - Houston (April 1999)

Flags:

1-Satellite coincidence data
2-Scan in TSDIS data
A-Major problem (moderate to strong AP > 25 dBZ &/or widespread coverage > 10%)
B-Minor problem (weak AP &/or very litte coverage)


*******************************************************************************

01 Apr 99:  No discernable precip echoes in first tilt.  Plenty of clear air 
            echo, though. 

            Data processed: 0002-2351Z  

            Sat. Coincidence: 0014Z(129 km), 1811Z(284 km), 1948Z(441 km),
                              2125Z(619 km), 2301Z(214 km) 

            QC notes:  0112-1515Z: Varying degrees of CAE intensity
                                   and coverage.
                             ----> Corrected.
                                     
                       1556Z, 1943Z, 2024Z, 2113-2123Z, 2152Z, 
                       2223Z, 2252Z,: CAE specks.
                             ----> Corrected.                             
                                  
            % of data reprocessed:  84/145 = 58% 

**************************************************************************

02 Apr 99:  A broken line of light precip moves w/in 150 km range near 19Z.
	    Some light showers develop to W of radar and move NE near 1640Z.

            Data processed: 0012-2356Z  

            Sat. Coincidence: 0037Z(693 km), 1659Z(742 km), 1835Z(185 km),
                              2012Z(613 km), 2149Z(460 km), 2325Z(243 km)    

            QC notes:      0151Z: CAE speck.
                            ----> Corrected.
            
         2B !!FLAG!!  0320Z, 0340-0350Z, 0409Z: Possible CAE patches to NW
                      & W, but there's also precip echoes in 2nd tilt in 
                      this region.  Therefore, cannot fully rule out that
                      the patches are light precip.  Echoes left in, but
                      period flagged as minor problem due to uncertainty.
                           RANGE: ~130-150 km. 
                      
                      0430-0500Z, 0524Z, 0539Z, 0559Z:  Most likely CAE
                      patches.  2nd tilt shows some light precip echoes,
                      but they don't seem to be near echoes in first 
                      tilt that remain in first-pass CZ.  Thus, echoes
                      will be removed.
                            ----> Corrected.  
                     
         2B !!FLAG!!  1254-1304Z: CAE to NW?  Appears to be, but not 
                                  entirely certain.  Removed echoes,
                                  but flagging as minor problem due to 
                                  uncertainty.
                                                      
                      1324-1635Z: CAE to NW?  Same situation as previous
                                  period, although there is probably a 
                                  mixture of CAE and precip in many of these
                                  VOSs.  Mostly CAE to SE.
     1B, 2B !!FLAG!!        ----> Partial corrections made, but still some
                                  CAE scattered about.
                           RANGE: Scattered mostly between 100-150 km. 
                                  
                      1640-2055Z: Mixture of CAE and developing light precip.
     1B, 2B !!FLAG!!        ----> Same as previous period...some corrections
                                  made, but some light, scattered CAE remains.
                           RANGE: Scattered mostly between 100-150 km.
                      
     1B, 2B !!FLAG!!  2100-2216Z: Possibly some CAE to E, as some light 
                                  echoes do not display good time continuity.
                                  Questionable echoes left intact, though, 
                                  since there are a few legitimate 2nd tilt
                                  echoes in this region, and moving QC params
                                  to remove the small, light questionable 
                                  echoes may harm broken line of light precip.
                                  Flagged as minor problem due to uncertainty.
                           RANGE: Scattered mostly between 100-150 km.  
                                                                                      
                                  
              % of data reprocessed:  102/254 = 40%                                     

*******************************************************************************

03 Apr 99:  Scattered light precip for much of the day, often combined with
            intense AP and/or sea clutter(?).  A few convective cells form
            to NW after 18Z, then an intense convective cluster develops
            near 1930Z to WNW and moves to the NE for rest of the day.
            Possible mesocyclone near 2200Z in an intense cell near 100 km
            range to the NNW.  Good TRMM overpass near 2213Z.

            Data processed: 0001-2350Z  

            Sat. Coincidence: 1723Z(163 km), 1859Z(497 km), 2036Z(599 km),
                              2213Z(122 km) 
            
            QC notes:       0018Z: Corrupt scan...not used in 1C-51.HDF
            
                       0127-0212Z: Light precip w/ light CAE &/or AP
                                   mostly in SE quadrant of scope.
                             ----> Corrected.
                                   
                       0217-1405Z: Light to moderate sea clutter(?) to
                                   SE.  Also some intense AP to ENE
                                   embedded in light precip near 03-05Z.
                                   Meanwhile, very light precip echoes
                                   almost constantly move in from SW to
                                   NE...echoes very prominent in 2nd tilt, 
                                   but not as much in 1st tilt.  More
                                   embedded AP to SW between 06-08Z. Very
                                   difficult QC situation.
     2A, 2B !!FLAG!!         ----> Intense, embedded AP impossible to
                                   remove, while many light spurious
                                   echo specks remain.  Situation is
                                   improved &/or corrected in many VOSs,
                                   but problems remain. 
                            RANGE: All spurious echo generally between
                                   100-150 km, although a few VOSs are
                                   contaminated near 75 km.
                                                                     
                       1410-2131Z: Some light CAE/sea clutter probably
                                   combined with &/or near precip, mostly
                                   in SE quadrant.  
     1B, 2B !!FLAG!!         ----> Period is improved, but it's all flagged
     				   as a minor problem since it's often difficult
     				   to distinguish between real and false light
     				   echo...rainmaps probably aren't greatly 
     				   affected.
                            RANGE: mostly between 100-150 km.
     				                                                                                                                  
            % of data reprocessed: 243/287 = 85% 

*******************************************************************************

04 Apr 99:  Very intense convective complex edges to the E/NE early in the
            day, moving completely out of the scope by 09Z.  Scattered
            patches of light to moderate precip between 09-14Z.  More
            scattered precip from 1545-2352Z.   

            Data processed: 0005-1512Z
                            1545-2352Z  

            Sat. Coincidence: 1611Z(595 km), 1747Z(273 km), 1924Z(627 km),
                              2100Z(396 km), 2237Z(372 km) 

            QC notes:  0208-0234Z:  Precip + CAE.
       2B !!FLAG!!           ---->  Precip forms w/in shield of CAE near
                                    radar.  Most likely some false echo
                                    surrounding precip cores, but difficult
                                    to distinguish exactly what is real 
                                    versus false.  Keeping VOSs as is and
                                    flagging period as a minor problem.
                             RANGE:
                              
                       0239-0404Z:  CAE to W & NW located away from precip.
       2A, 2B !!FLAG!!       ---->  Much improved away from radar, but still
                                    may be CAE surrounding precip cores near
                                    radar, similar to previous period. Major
                                    flag indicated for embedded clutter 
                                    speck to W between 0244-0324Z. 
                             RANGE: 
                             
                       0409-0440Z:  CAE & intense AP to NW and W + precip.
                             ---->  Corrected, except for:
       2A !!FLAG!!           ====>  0435-0440Z:  Intense AP diminshed greatly
                                    but still a small sliver w/in 150 km at
                                    0435Z and a small patch at 0440Z.  Much
                                    better than defaults, though. 
                       
                       0445-0851Z:  Scattered light CAE + precip.
                             ---->  Corrected. 
                             
                       0911-0921Z:  A few light CAE specks + light precip.
                             ---->  Corrected. 
                             
                       1502-1540Z:  Some CAE in 2nd tilt.
       2B !!FLAG!!           ---->  Improved, but not perfect.  Very minor
                                    problem since echo is so light.
                            
                       1545-1755Z:  Spurious echo patches to SE?  Difficult
                                    to tell. CAE also in 2nd tilt to SE.
       2A !!FLAG!!           ---->  Corrected except for embedded clutter
                                    specks to NW between 1634-1649Z and 
                                    1700-1710Z. 
                            RANGE:  Clutter specks near 50 km.
                                    
                       2016-2107Z:  Light, small false echo to ENE.
       1B, 2B !!FLAG!!       ---->  Small, light specks kept in and period
                                    flagged as a minor problem, since 
                                    removing specks also removed small 
                                    pockets of precip.
                       
       1B, 2B !!FLAG!! 2137-2352Z:  Perhaps some light false echo to in NW
                                    quadrant.  Could be all light precip,
                                    but difficult to distinguish.  May just
                                    be boundary layer features and not
                                    accumulating precip.  Left as is and 
                                    flagged as potential minor problem.
                                                                                                                                                                    
            % of data reprocessed:  107/271 = 39%
            
*******************************************************************************

05 Apr 99:  A few light showers before 02Z.  Boundary moves in from W after
            14Z with some associated small, scattered precipitation. 

            Data processed: 0002-2352Z
                           
            Sat. Coincidence: 1635Z(48 km), 1811Z(543 km), 1948Z(568 km),
                              2125Z(21 km)
                              
            QC notes:  0002-0234Z:  Some light showers perhaps mixed in
                                    with some light CAE.
       2B !!FLAG!!           ---->  Handled similarly to last period of
                                    previous day.  Data kept intact, but
                                    period is flagged as having potentially
                                    minor CAE contamination.
                                    
                       0239Z, 0254Z, 0309Z, 0319-0329Z:  Light precip to 
                                    NE + CAE specks to W/NW. 
                             ---->  Corrected.
                       
                       0334-0639Z:  CAE to W/NW...no precip w/in 150 km.
                             ---->  Corrected. 
                       
                       1245-1422Z:  CAE to NW.
                             ---->  Corrected inside 150 km. 
                       
                       1427-2256Z:  CAE mixed in w/ some scattered precip.
                                    Very difficult to distinguish what's
                                    precipitating precip vs. CAE along
                                    boundary as it moves to E.
       1B, 2A, 2B !!FLAG!!   ---->  Increased params to remove some obvious
                                    CAE before 18Z, but still a degree of
                                    uncertainty as to what's legitimate
                                    precip and what's clear-air echo due 
                                    to the obvious boundary moving through
                                    the radar scope.  After 18Z, didn't 
                                    change defaults...just left as is and
                                    flagged whole period for problems.  The
                                    major flag applies to some questionable
                                    echo to W before 1630Z that may just be
                                    moderately intense CAE. 
                                     
                       2301-2352Z:  AP along boundary?
                             ---->  Removed all echo during this time period.
                                    Echo appears to transition into AP...very
                                    radially aligned, little vertical continuity,
                                    it's located right behind boundary's leading
                                    edge, and velocities are mostly zero w/in
                                    the questionable echo.  Looked at images 
                                    from the next day, and it appears even more 
                                    AP-like in later hours.                                     
                                                  
            % of data reprocessed:  100/230 = 43%                               
             
*******************************************************************************

06 Apr 99:  No distinguishable precipitation.

            Data processed: 0016-2341Z
                           
            Sat. Coincidence: 1522Z(458 km), 1658Z(350 km), 1835Z(631 km),
                              2012Z(325 km), 2148Z(505 km)
                              
            QC notes:  0016-1457Z, 1605Z, 1754Z, 1833-2341Z: AP & CAE.
                             ---->  Corrected.
                             
            % of data reprocessed:  156/176 = 89%
            
*******************************************************************************

07 Apr 99:  No distinguishable precipitation echoes.

            Data processed: 0008-2357Z
                           
            Sat. Coincidence: 1546Z(58 km), 1723Z(580 km), 1900Z(528 km),
                              2036Z(89 km)
                              
            QC notes:  0008-2357Z:  CAE/sea clutter patches and specks.
                             
            % of data reprocessed:  144/144 = 100%
            
*******************************************************************************

08 Apr 99:  Dry.

            Data processed: 0008-0057Z,
                            0146-2346Z
                           
            Sat. Coincidence: 1434Z(326 km), 1610Z(420 km), 1747Z(623 km),
                              1924Z(243 km), 2100Z(646 km)
                              
            QC notes:  0008-0844Z, 0904Z, 0933Z, 1133-2346Z:  Scattered,
                                   mostly light, CAE and AP/sea clutter.
                            ---->  Corrected. 
                             
            % of data reprocessed:  133/147 = 90%            

*******************************************************************************

09 Apr 99:  No distiguishable precip echoes.  Some questionable echoes after
            15Z appear to be chaff.

            Data processed: 0038-2345Z
                           
            Sat. Coincidence: 1458Z(156 km), 1634Z(607 km), 1811Z(478 km),
                              1948Z(205 km)
                              
            QC notes:  0038-2345Z: Combination of CAE, AP, sea clutter, and
                                   chaff throughout the entire day.
                             --->  Corrected.  
                             
            % of data reprocessed:  155/155 = 100%
            
*******************************************************************************

10 Apr 99:  No distinguishable precip echoes.  Sea clutter and chaff 
            prevalent again, though.

            Data processed: 0006-2357Z
                           
            Sat. Coincidence: 1345Z(205 km), 1522Z(478 km), 1659Z(607 km),
                              1835Z(155 km)
                              
            QC notes:  0006-2357Z:  Combination of CAE, moderate to intense
                                    sea clutter, and chaff throughout day.
                             ---->  Corrected. 
                             
            % of data reprocessed:  174/174 = 100%

*******************************************************************************

11 Apr 99:  No significant precip echoes.  Perhaps a few light showers
            to W after 22Z, but otherwise dry.

            Data processed: 0006-2342Z
                           
            Sat. Coincidence: 1233Z(644 km), 1409Z(244 km), 1546Z(624 km),
                              1723Z(419 km), 1859Z(328 km)
                              
            QC notes:  0006-1118Z, 1228Z, 1248-1327Z, 1348Z, 1516-2223Z:  
                                    Chaff, CAE, and light AP. 
                             ---->  Corrected.
                       
                       2233-2342Z:  Light spurious echo to E/SE, perhaps
                                    some light precip to W.
                             ---->  Corrected spurious echo and kept some
                                    of the light precip (?), except for
                                    following VOSs:
       2B  !!FLAG!!          ====>  2332-2342Z:  Light spurious echo to E.   
                             
            % of data reprocessed:  127/143 = 89%                   

*******************************************************************************

12 Apr 99:  Some precip echoes to W in first hour of day, otherwise 
            appears to be dry.  Chaff after 14Z.

            Data processed: 0011-2355Z
                           
            Sat. Coincidence: 1257Z(87 km), 1434Z(529 km), 1610Z(580 km),
                              1747Z(57 km)
                              
            QC notes:  0011-0026Z: Precip to W + light CAE to E.
                             --->  Corrected.
                             
                       0049-0109Z: Precip to W + light CAE to E.
       2B !!FLAG!!           --->  Raising QC params eliminates precip,
                                   so left as is.  Very minor problem.
            
                       0114-1302Z, 1312Z:  Combination of light CAE, light
                                   to intense AP.
                             --->  Corrected.
                                   
                       1421-2355Z: Chaff and CAE.
                             --->  Corrected. 
                                                               
            % of data reprocessed:  240/252 = 95%

*******************************************************************************

13 Apr 99:  No recognizable precip echoes.  Plenty of chaff and CAE.

            Data processed: 0001-2349Z
                           
            Sat. Coincidence: 1145Z(505 km), 1321Z(324 km), 1458Z(630 km),
                              1634Z(351 km), 1811Z(457 km) 
                              
            QC notes:  0001-0936Z: Chaff & CAE.
                       1037-1126Z: Light CAE. 
                       1146-1225Z: Light CAE.
                       1434-2349Z: Chaff.
                             --->  All problems corrected.   
                                                               
            % of data reprocessed:  174/192 = 91%             
            
*******************************************************************************

14 Apr 99:  Chaff remnants early.  Fairly thin convective line moves
            in from WNW after 10Z.  By 1615Z, thin line w/ some intense
            pockets of precip stretched from NE to SW through entire
            radar scope.  Decent TRMM overpasses at 1208Z and 1658Z.
            Precip moves out after 22Z.  Some chaff & precip combined
            together in scope after 20Z.

            Data processed: 0031-2358Z
                           
            Sat. Coincidence: 1208Z(19 km), 1345Z(567 km), 1522Z(544 km),
                              1658Z(46 km) 
                              
            QC notes:  0031-0725Z: Chaff & CAE.
                             ----> Corrected.
                             
                       0923-1956Z: CAE shield to NW + precip moving in from W.
                                   Difficult to differentiate between CAE 
                                   and light precip. Some moderate to intense
                                   AP near 1620-1725Z.
                             ----> See following flags:
       1B, 2B !!FLAG!!       ====> 0923-1625Z: Improvements made to obvious
                                   CAE patches, but there still may be CAE
                                   on fringes of precip.  
       1A  !!FLAG!!          ====> 1630-1725Z: Moderate to intense patches
                                   of AP behind precip to NW.  Situation made
                                   more difficult to QC since precip at tail
                                   end of line easily removed if height 
                                   thresholds are increased.
       2B  !!FLAG!!          ====> 1730-1800Z: Mostly corrected, but same
                                   situation as 0923-1625Z.
       2A, 2B  !!FLAG!!      ====> 1805-1830Z: Clutter specks to NW.
       2B  !!FLAG!!          ====> 1835-1956Z: Some scattered patches of light
                                   CAE still hang around.
                                   
                       2001-2242Z: Chaff, CAE, and precip combined.
                             ----> Corrected w/in 150 km after 2207Z:
       2A  !!FLAG!!          ====> 2001-2207Z: Chaff cannot be be removed
                                   w/in 150 km while keeping precip intact.
                       
                       2247-2358Z: 2nd trip to S?
                             ----> Corrected.
                                             
                                                               
            % of data reprocessed:  232/261 = 89%

*******************************************************************************

15 Apr 99:  Sea clutter, AP, and chaff.           

            Data processed: 0004-2338Z
                           
            Sat. Coincidence: 1056Z(373 km), 1232Z(396 km), 1409Z(627 km),
                              1546Z(274 km), 1722Z(594 km)
                              
            QC notes:  0004-0617Z: Sea clutter or 2nd trip? Echo mass has
                                   velocity return, but no vertical structure.
                             ----> Corrected.
                                                                
                       1431-1542Z: Chaff.
                             ----> Corrected.
                             
                       1705-1821Z: Chaff.
                             ----> Corrected.
                             
                       1950-2129Z: Chaff. 
                             ----> Corrected.                                            
                                                               
            % of data reprocessed:  116/218 = 53%
            
*******************************************************************************

16 Apr 99:  Scattered light to moderate precip affecting mostly the S/SE
            part of radar scope between 01-10Z.  Echoes during this time
            were first treated as suspect since chaff has been prevalent
            in recent days and radar was in clear-air mode.  Echoes don't
            have distinctive chaff appearance, though, and good vertical
            structure.         

            Data processed: 0035-2357Z
                           
            Sat. Coincidence: 1120Z(121 km), 1257Z(598 km), 1434Z(497 km),
                              1610Z(162 km)
                              
            QC notes:  0105-0801Z: Precip removed by defaults.  QC made
                                   more difficult since radar is in clear
                                   air mode, thus vertical resolution of
                                   VOSs isn't as good as precip mode.
                                   
                       1428-2357Z: Is everthing chaff during this period?
                                   Obvious chaff from 1428-1627Z in SE
                                   near 150 km, but other echoes are not
                                   as obvious to identify.  They don't
                                   start off as point sources in second
                                   tilt like echoes over Gulf near 14Z,
                                   they have decent vertical structure,
                                   and radar goes into precip mode.  
                                   Checked archive of surface map, and 
                                   there's evidence of light showers over
                                   Gulf to E of Galveston/S of Louisiana.
       1A, 2A  !!FLAG!!      ----> Keeping all echoes intact, but flagging
                                   the period as major problem due to 
                                   obvious chaff contamination, and 
                                   also because much of the other echo
                                   may not be real...but just can't discount
                                   the fact that is legitimate. 
                                                                               
                                                               
            % of data reprocessed:  43/174 = 25% 
            
*******************************************************************************

17 Apr 99:  Dry.        

            Data processed: 0027-2359Z
                           
            Sat. Coincidence: 1008Z(247 km), 1144Z(458 km), 1321Z(614 km), 
                              1458Z(188 km), 1634Z(737 km)
                              
            QC notes:  0525Z, 0913Z, 0943-0953Z, 1212-1222Z, 1301-1411Z, 
                       1640Z, 1700Z:  Scattered specks of light to intense
                                      spurious echo.
                               ---->  Corrected.                                            
                                                               
            % of data reprocessed:  16/140 = 11% 
            
*******************************************************************************

18 Apr 99:  No significant precip echo.       

            Data processed: 0007-1022Z,
                            1128-2343Z
                           
            Sat. Coincidence: 0855Z(698 km), 1031Z(212 km), 1208Z(619 km),
                              1345Z(443 km), 1521Z(280 km) 
                              
            QC notes: 0146-0155Z, 0305Z, 0335Z, 0404-0425Z,  
                      0534-0623Z, 0942Z: Light CAE. 
                             --->  Corrected.
                                                 
                      1227-1347Z:  Light echo patch moves in from NW.
                             --->  Is it precip?  Has vertical structure,
                                   radial velocity signature...assuming
                                   it's a light precip echo.
                                   
                      1357-1417Z:  Light to moderate AP/CAE specks.
                             --->  Corrected.
                             
                      1955Z, 2233-2243Z:  Light CAE.
                             --->  Corrected.
                                                                                
            % of data reprocessed:  22/138 = 16%
            
*******************************************************************************

19 Apr 99:  Dry.  Chaff & plenty of clear-air echo.        

            Data processed: 0003-2353Z
                           
            Sat. Coincidence: 0919Z(133 km), 1055Z(509 km), 1232Z(592 km),
                              1409Z(97 km) 
                              
            QC notes: 0302Z, 0332Z, 0351Z, 1148Z, 1208Z, 
                      1228-1357Z:  Light CAE specks/patches.
                             --->  Corrected.
                             
                      1441-2353Z:  Chaff.                                                                 
                                                               
            % of data reprocessed:  98/171 = 57%
            
*******************************************************************************

20 Apr 99:  Dry.  CAE and chaff again.        

            Data processed: 0004-2352Z
                           
            Sat. Coincidence: 0806Z(560 km), 0943Z(294 km), 1119Z(629 km),
                              1256Z(379 km), 1433Z(406 km) 
                              
            QC notes: 0004-0034Z:  Light chaff remants from previous day.
                             --->  Corrected.
                             
                      0213-0720Z:  Widespread light CAE.
                             --->  Corrected. 
                             
                      0900-0910Z, 0939Z, 0959Z, 1028-1049Z, 1218Z, 
                      1237-1426Z:  Light CAE.
                             --->  Corrected.
                             
                      1606-2352Z:  Chaff.
                             --->  Corrected.                                           
                                                               
            % of data reprocessed:  104/145 = 72%
            
*******************************************************************************

21 Apr 99:  A few small convective cells from ~14-16Z, otherwise no
            significant precip.  Chaff and CAE prevalent again.       

            Data processed: 0002-2359Z
                           
            Sat. Coincidence: 0830Z(21 km), 1007Z(554 km), 1144Z(559 km),
                              1320Z(7 km)  
                              
            QC notes: 0002-1016Z:  Sometimes widespread CAE.
                            ---->  Corrected.
                            
                      1105Z, 1206Z-1334Z:  Mostly light CAE.
                            ---->  Corrected.
                            
                      1355-1625Z:  Precip combined w/ light CAE and
                                   some light chaff to S.104
                            ---->  Much improved over defaults. 
                                   Doesn't appear to be any false 
                                   echo in CZ.
                            
                      1630-2359Z:  Widespread chaff and CAE w/ no
                                   significant precip w/in 150 km.
                            ---->  Corrected.  Diagnosed as chaff
                                   since echo originates from point
                                   source and disperses, similar to
                                   previous chaff cases.                       
                                                               
            % of data reprocessed:  188/196 = 96%
            
*******************************************************************************

22 Apr 99:  No discernable precip echoes. Sometimes widespread chaff & CAE. 
            NOTE: Changed default H2 param to 3.0 km to see if first-pass
            processing efficiency improves at all.
            Data processed: 0005-2355Z
                                       
            Sat. Coincidence: 0718Z(423 km), 0854Z(370 km), 1031Z(630 km).
                              1208Z(304 km), 1344Z(541 km)
                                                   
            QC notes: 0005-0536Z:  CAE and chaff.  Did not include
                                   0024Z in 1C-51.HDF product...appears to
                                   be a partial scan.                     
                            ---->  Corrected. 
                            
                      0606Z, 0656Z, 0921Z:  CAE.
                            ---->  Corrected.
                       
                      1240-2016Z:  CAE, sometimes widespread.
                            ---->  Corrected.
                      
                      2156-2206Z:  CAE.
                            ---->  Corrected.
                              
            % of data reprocessed:  105/163 = xx%
            
*******************************************************************************

23 Apr 99:  No precip echoes.  Large shield of CAE.       

            Data processed: 0005-2353Z
                           
            Sat. Coincidence: 0742Z(83 km), 0919Z(588 km), 1055Z(517 km),
                              1232Z(116 km)
                              
            QC notes: 0204-0712Z:  Sometimes widespread CAE.
                            ---->  Corrected.
                            
                      1249-2353Z:  CAE (& 2nd trip at 2353Z).
                            ---->  Corrected.                                  
           
            % of data reprocessed:  90/145 = 62%
            
*******************************************************************************

24 Apr 99:  Dry.  Doppler velocity shows a shallow feature near 11Z 
            moving to the north, but no significant echoes are associated
            with it.              

            Data processed: 0007-2351Z
                           
            Sat. Coincidence: 0629Z(297 km), 0806Z(434 km), 0943Z(620 km),
                              1119Z(223 km), 1256Z(679 km)
                              
            QC notes: 0007-0839Z:  Sometimes widespread CAE and 2nd trip
                                   (or is it sea clutter?) to SE.
                            ---->  Corrected. 
                                                 
                      1146Z, 1206Z-2351Z:  CAE.
                            ---->  Corrected.                   
                                                               
            % of data reprocessed:  127/145 = 88% 
            
*******************************************************************************

25 Apr 99:  Patches of light to moderate precip move in from W after 13Z.       

            Data processed: 0013-2359Z
                           
            Sat. Coincidence: 0653Z(175 km), 0830Z(611 km), 1007Z(466 km),
                              1143Z(230 km)
         
                              
            QC notes: 0020-0030Z, 0101Z, 0210-0249Z:  Light CAE specks.
                            ---->  Corrected. 
                            
                      0300-0707Z:  CAE increasingly more intense & widespread.
                            ---->  Corrected. 
                      
                      1126Z, 1147Z-1217Z:  CAE/AP specks to E.
                            ---->  Corrected. 
                      
                      1242-1257Z, 1312Z:  Light to moderate spurious echo 
                                   specks to S & E w/ small, light precip 
                                   echo to W.
                            ---->  Corrected.
                                   
                      1316Z & 1342Z: Light 2nd trip to S, no precip w/in 
                                     150 km.
                            ---->  Corrected. 48
                                     
                      1357-2359Z:  Light to moderate precip to W, light to 
                                   intense AP, 2nd trip to S & E. Mostly
                                   light spurious echo after 1830Z.
                            ---->  Vastly improved versus defaults.  The
                                   following VOSs still have some problems,
                                   though:
       2A, 2B  !!FLAG!!     ====>  1452Z, 1537Z, 1628-1648Z, 1732-1759Z,
                                   1819Z:  Light to intense AP &/or CAE,
                                   mostly to E.
                            ====>  1933-2353Z:  Perhaps some light CAE still
                                   remaining.  Flagging whole period as a 
                                   very minor problem.   
                                                                                
            % of data reprocessed:  169/227 = 74%
            
*******************************************************************************

26 Apr 99:  Scattered showers in S and SE through 09Z, then intense convective
            complexes move in after 15Z.  By 20Z, majority of precipiation is
            stratiform, covering a large portion of the scope.  Stratiform
            and some embedded convection continue moving eastward through
            rest of the day.  TRMM overpass at 0541Z captures some small,
            scattered precip in SE quadrant.       

            Data processed: 0005-2356Z
                           
                          
            Sat. Coincidence: 0541Z(177 km), 0717Z(491 km), 0854Z(601 km),
                              1031Z(133 km)
                              
            QC notes: 0005-0657Z: CAE, sometimes widespread, + precip.
       1B, 2B !!FLAG!!      ----> Vastly improved, although some CAE 
                                  still exists on fringes of precip (esp after. 
                                  0130Z). Very minor problem, especially when
                                  compared to original first-pass processing.
                                  
                           1147Z: CAE specks to NW.
                            ----> Corrected.
                            
                      1258-1353Z: CAE to NW + small showers to SE and
                                  light showers to NW.
       2B !!FLAG!!          ----> Improvements made w/ CAE, but still
                                  some remnants of it surrounding
                                  light precip.
                      
                                                                     
                      1554-2005Z: CAE + precip.
       2A, 2B !!FLAG!!      ----> Some improvements, but still could be
                                  CAE combined w/ precip.  Flagged as 
                                  a minor problem before 19Z. There may
                                  be some moderate CAE near precip
                                  or embedded w/in it after 19Z (SE quadrant).
                      
                      2010-2311Z: Interesting combination of problems.  CAE
                                  still hanging around, mostly in SE quadrant.
                                  AP embedded in precip to W and SW from 2010-
                                  2035Z, then transitioning into widespread AP
                                  embedded and outside precip shield through
                                  2135Z.  Clutter filter seems to be employed
                                  after 2126Z.  Appear to be holes in precip
                                  to W/NW of radar between 21-22Z not related
                                  to QC algorithm (i.e. holes appear in DZ, too).
                                  More embedded AP to NE near 2215Z, plus
                                  intense clutter specks to NW & W.  To make matters
                                  worse, QC algorithm defaults remove legitimate
                                  precip beginning near 2220Z.  This is an ugly
                                  concoction of events that makes QC for this 
                                  period very miserable.
       2A !!FLAG!!          ----> AP near 2100Z impossible to remove since there's
                                  echo above it in the second tilt.  Very major
                                  problems with this period.
                                  
                      2316-2356Z: Holes in precip created by defaults params. 
                            ----> Corrected.
                                                          
            % of data reprocessed:  194/279 = 70%

*******************************************************************************

27 Apr 99:  Stratiform from convective system on 26 April moves out of scope
            by 02Z.  A few showers over Gulf from 12-13Z, otherwise dry.          

            Data processed: 0001-2352Z
                           
            Sat. Coincidence: 0429Z(610 km), 0605Z(264 km), 0742Z(626 km),
                              0918Z(403 km), 1055Z(359 km) 
                              
            QC notes: 0022-0032Z, 0042-0047Z:  Light CAE to ENE.
                            ----> Corrected.
                            
                      0214-0601Z: CAE. 
                            ----> Corrected. 
                            
                      0844-0855Z, 0907Z: Speck to SE.
                            ----> Corrected.42
                            
                      1000Z, 1029Z, 1140Z, 1327-1337Z, 2054-2103Z, 
                      2144-2203Z, 2233-2352Z: Light specks to E.
                            ----> Corrected.
                                                                                   
            % of data reprocessed:  61/184 = 33%                                

*******************************************************************************

28 Apr 99:  A few small light to moderate showers to NW near 10Z.  Otherwise
            dry with widespread spurious echo.
 
            Data processed: 0043-2355Z
                           
            Sat. Coincidence: 0453Z(60 km), 0629Z(539 km), 0806Z(572 km),
                              0943Z(31 km)
                              
            QC notes: 0043-0919Z: CAE, often widespread.
                            --->  Corrected.  
            
                      0924-1019Z: CAE & AP w/ a few showers to NW.
       1B, 2B !!FLAG!!      --->  Corrected much of the CAE, but still
                                  CAE surrounding precip cores.
                      
                      1100Z, 1125Z, 1135Z, 1214-1400Z, 2146Z, 
                      2225-2355Z: Scattered spurious echo specks.
                            --->  Corrected.
                                                                               
            % of data reprocessed:  121/216 = 56%

*******************************************************************************

29 Apr 99:  Dry, except for strange looking echo near 23Z that pops up
            to W of radar.  
 
            Data processed: 0004-2346Z
                           
            Sat. Coincidence: 0340Z(471 km), 0517Z(343 km), 0653Z(630 km),
                              0830Z(332 km), 1007Z(492 km)
                              
            QC notes: 0004-1421Z: CAE and AP.
                            --->  Corrected.
                             
                      1541-1551Z: AP specks.
                            --->  Corrected.
                            
                      2009-2028Z: CAE specks.
                            --->  Corrected.
                            
                      2117-2246Z: CAE.
                            --->  Corrected.
                            
                      2257-2346Z: Strange echo near end of the day about
                                  125 km range, ~280 degrees azimuth.
                                  Not entirely comfortable calling this
                                  echo precip, but it has vertical structure 
                                  and forms along a boundary. Also CAE to SW.  
                            --->  Corrected, except for following VOS:
       2B !!FLAG!!          ===>  2326Z:  Patch of spurious echo to SW
                                  cannot be removed w/o also removing
                                  precip (or what I think may be precip).
                                                                                     
            % of data reprocessed:  128/163 = 79%                

*******************************************************************************

30 Apr 99:  Dry. 
 
            Data processed: 0007-2349Z
                           
            Sat. Coincidence: 0404Z(46 km), 0541Z(577 km), 0718Z(533 km),
                              0854Z(76 km)
                              
            QC notes: 0007-0847Z: CAE, often widespread.
                            --->  Corrected. 
            
                      2111-2121Z, 2140Z, 2200Z, 
                      2220-2349Z: Scattered light CAE.
                            --->  Corrected. 
                                                                                     
            % of data reprocessed:  66/143 = 46%  

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