Site log - Kwaj (Dec 1997)
Flags:
1-Satellite coincidence data
2-Scan in TSDIS data
3-Scan not in TSDIS data
A-Major problem (moderate to strong AP &/or widespread coverage)
B-Minor problem (weak AP &/or very litte coverage)
*********************************************************************************************
01 Dec 97:    Scattered showers throughout the day.
              Data processed:    0000-2355 Z
              QC notes:  0148-0218Z: second-trip echo remaining E of radar
                             ----->  corrected
                              0623Z: radial-spike remnant WSW of radar
                             ----->  corrected
                         1107-2355Z: second-trip echo remaining SE to S of radar
                             ----->  corrected
*********************************************************************************************
02 Dec 97:    Very little precipitation in the form of widely scattered showers.
              Data processed:    0004-2355 Z
              QC notes:  0004-0222Z: second-trip echo remaining S of radar
                             ----->  corrected
*********************************************************************************************
03 Dec 97:    Scattered showers and convection throughout the day, with more rain present
              after 12Z.
              Data processed:    0005-1959 Z
                                 2136-2358 Z
              QC notes:  1217-1500Z: second-trip echo remaining SE of radar
                             ----->  corrected
*********************************************************************************************
04 Dec 97:    Scattered showers and convection throughout the day.
              Data processed:    0008-2359 Z
              QC notes:       0623Z: radial spike remnants SW of radar
                             ----->  corrected
                         0642-0819Z: second-trip echo remaining N of radar
                             ----->  corrected
                         0945-1336Z: second-trip echo remaining NW, N, and E of radar
                             ----->  corrected
                         1405-1425Z: second-trip echo remaining NW of radar
   2B         !!FLAG!!       ----->  some of the weak seocnd-trip was removed but some
                                     remains as well in the form of a 10 dB reflectivity
                                     splotch. Could not remove further false echo without
                                     removing precip.
                         1718-1826Z: second-trip echo remaining NW of radar
   2B         !!FLAG!!       ----->  most of second-trip removed but most VOS's still
                                     contain very weak splotches of second-trip, especially
                                     adjacent to precip.  Could not further remove false
                                     echo without removing precip.
                              1855Z: radial spike remnants SE of radar
                             ----->  corrected
*********************************************************************************************
05 Dec 97:    Widely scattered showers and convection.
              Data processed:    0009-2350 Z
              QC notes:       1856Z: radial spike remnants SE of radar
                             ----->  corrected
*********************************************************************************************
06 Dec 97:    Scattered showers and convection throughout the day.
              Data processed:    0000-2359 Z
              QC notes:  0227-0237Z: second-trip echo remaining E of radar
                             ----->  corrected
                              0335Z: radial spike remnants N of radar
                             ----->  corrected
*********************************************************************************************
07 Dec 97:    Scattered showers early quickly gives way to a large precipitation shield
              of moderate intensity with lots of convection which remains within the
              radar's scope for most of  the day.
              Data processed:    0009-2354 Z
              QC notes:  0009-0704Z: second-trip echo remaining SW of radar
                             ----->  corrected
                         0704-0831Z: decrease in reflectivity as precip moves into
                                     immediate vicinity of the radar (~0-20 km from radar)
                                     nothing can be done on our end.
   1A         !!FLAG!!       ----->  unfortunately, TRMM overpass occurred at 0738Z at
                                     a distance of 26 km!
                         0723-0900Z: second-trip echo remaining NW and SW of radar
                             ----->  corrected
   2A         !!FLAG!!   0929-1017Z: possible decrease in reflectivity as precip moves into
                                     immediate vicinity of the radar (~0-20 km from radar)
                                     nothing can be done on our end.
                         1017-1046Z: second-trip echo remaining NW of radar
                             ----->  corrected
                         1340-1437Z: second-trip echo remaining SE of radar
                             ----->  corrected
   2A         !!FLAG!!   1457-1614Z: decrease in reflectivity as precip moves into
                                     immediate vicinity of the radar (~0-20 km from radar)
                                     nothing can be done on our end.
                         1624-1653Z: second-trip echo remaining SW of radar
   3B         !!FLAG!!       ----->  Much improved but VOS's 1633 and 1643 still have a splotch
                                     of week second-trip echo remaining.  I feel bad even
                                     flagging this since the false echo is so small and weak
                                     but I did anyways.
                         1917-2149Z: second-trip echo remaining NW of radar
                             ----->  corrected
********************************************************************************************
08 Dec 97:    Scattered showers throughout the day, as well as some larger, more organized
              convective clusters.
              Data processed:    0004-2355 Z
              QC notes:      0326Z:  second-trip echo remaining E of radar
                             ----->  corrected
                             0629Z:  radial spike remaining to the SW
                             ----->  corrected
                        1608-1852Z:  second trip echo remaining N of radar
                             ----->  corrected...a few stray light showers may have
			             been eliminated, but nothing major.
                        2150-2355Z:  second trip echo remaining N of radar
                             ----->  corrected
********************************************************************************************
09 Dec 97:    Scattered showers intermingled with numerous organized squall lines and
	      convective clusters throughout the day.
              Data processed:    0004-2351 Z
              QC notes:      0221Z:  second-trip echo remaining E of radar
                             ----->  corrected
                        0455-0534Z:  decrease in reflectivity as precip moves into
                                     immediate vicinity of the radar (~0-20 km from radar)
  2A         !!FLAG!!        ----->  nothing can be done on our end.
                        0603-0612Z:  second-trip echo remaining
                             ----->  corrected
                             0632Z:  second-trip echo remaining
                             ----->  corrected
                        0827-2351Z:  lots of second-trip echo remaining in various
				     locations w/in radar scope...mostly light, isolated
                                     specks and splotches
                             ----->  corrected...may be some light false echo specks
				     in a few VOSs, but very minor.  Near the end of
				     the period, some second trip may be included
				     around some of the cells that move through the
				     well-defined region of second-trip to the SSE,
				     but it's very difficult to shave this spurious
				     echo away.  Lastly, some small, light cells may
				     be eliminated.  Overall, though, this whole
			             period looks fairly decent when compared to DZ.
********************************************************************************************
10 Dec 97:   Numerous squall line and large convective clusters. Bands of precip
             associated with TS Paka move in after ~1700 Z.
              Data processed:    0000-2358 Z
              Satellite coincidence:  0539Z, 1700Z
              QC notes:  0000-0020Z:  second-trip echo remaining to the SSW.
                              ----->  corrected
                         0029-0137Z:  second-trip echo to SSW 'til 0108Z...also
				      reduction in reflectivity intensity as heavier
				      precip moves over radar
  2A          !!FLAG!!        ----->  nothing can be done on our end for the reduction
				      in dBZ. Second-trip problem mostly solved.
                         0509-0617Z:  second-trip echo remaining to E and SE
                              ----->  corrected
                              0626Z:  radial spike to WSW
  3A          !!FLAG!!        ----->  some light remnants remain, but mainly near 150 km
			              and greater.
                         0901-2358Z:  second-trip echo remaining mostly in the southern
				      half of the domain.
  1B and 2B   !!FLAG!!        ----->  much of the worst second-trip is removed in this time
				      period, but some still remains.  It's mostly light,
			              thus the minor flag.  It mostly occurs when a small
				      cell moves through a region of second-trip, and some
			              'residual' spurious echo is kept around the cell.
	                              Some random spikes are also evident in a few VOSs,
********************************************************************************************
11 Dec 97:  Paka continues to bring plentiful moderate to heavy precip for the
	    whole day.  The eye first appears in the SSE after 0930Z, then moves
	    NW throughout the day mostly between 150 and 200 km from the radar.
              Data processed:    0008-2352 Z
              Satellite coincidence:  0603Z, 1547Z (only 50 km away!)
              QC notes:  Reduction in dBZ close to the radar occurs for much
			 of the day, esp. between the following times:
   2A         !!FLAG!!   0439-0537Z
   2A         !!FLAG!!   0733-0939Z
   1A and 2A  !!FLAG!!   1106-2352Z
                         Other qc problems:
                         0008-0654Z:  Some second-trip echoes remaining, but very
				      difficult to distinguish when precip moves
			              close to the spurious echo.
                               -----> corrected.  This is a borderline period.
				      Some second trip may remain, but it's masked
				      by legitimate precip.  Most of the echoes in
				      this period, though, have temporal and vertical
				      continuity and Doppler velocities support their
				      existence.  The second-trip, if any, is under
				      10-15 dBZ, so a few specks of it here or there
				      shouldn't be too much of a problem.
********************************************************************************************
12 Dec 97:    Moderate to heavy bands and clusters of precip from Paka for most of
	      the day.  The eye moves out of sight 0500Z.  Very good precip data, though,
              except for the reduction in reflectivity surrounding the radar.
              Data processed:    0001-2359Z
              Satellite coincidence: 0450Z, 1435Z
              QC notes:  Reduction in dBZ close to the radar occurs for much
                         of the day, esp. between the following times:
   2A         !!FLAG!!   0001-0325Z
   1A and 2A  !!FLAG!!   0414-1131Z
   2A         !!FLAG!!   1739-2004Z
                         Other qc problems:
                         0227-1659Z:  Some second-trip echoes remaining, but very
                                      difficult to distinguish when precip moves
                                      close to the spurious echo.
                               -----> corrected.  Another borderline period.
                                      Some second trip may remain, but it's masked
                                      by legitimate precip or is very light, so
                                      a few specks of it here or there shouldn't
                                      present too much of a problem.
********************************************************************************************
13 Dec 97:    Widespread moderate to heavy precip through ~0400Z, then dissipates a bit.
              Band of moderate to intense precip lingers to the SSW from ~1100-2353Z.
              Data processed:    0009-2353Z
              Satellite coincidence: 0514Z, 1459Z
              QC notes:  Reduction in dBZ close to the radar occurs for much
                         of the day, esp. between the following times:
   2A         !!FLAG!!   0009-0057Z
                         Other qc problems:
                         0009-2353Z:  Some second-trip echoes remaining most of
				      the day.
                               -----> corrected.  Another borderline period.
                                      Some second trip may remain, but it's masked
                                      by legitimate precip or is very light, so
                                      a few specks of it here or there shouldn't
                                      present too much of a problem (same as past
				      two days!).
********************************************************************************************
14 Dec 97:    Band of convection, weakening to showers, moves over the radar early on. After
              that, no real significant preciptation
              Data processed:    0003-2351 Z
              Satellite Coincidence:  0402Z, 1346Z
              QC notes: 0817-1140Z: second-trip echo remaining
                            ----->  corrected
                             0934Z: radial spike remnants remaining
                            ----->  corrected....any spike remnants remaining is beyond 150 km.
                             1022Z: radial spike remnants remaining
                            ----->  corrected....any spike remnants remaining is beyond 150 km.
                             1257Z: second-trip echo remaining
                            ----->  corrected
                        1415-1434Z: second-trip echo remaining
                            ----->  corrected
                        1503-1640Z: second-trip echo remaining
                            ----->  corrected
**********************************************************************************************
15 Dec 97:    Very widely scattered, weak showers early in the day increase significantly in
              coverage but the showers are still weak.
              Data processed:    0001-2353 Z
              Satellite Coincidence:  1410Z
              QC notes:       0626Z: radial spike remnants remaining SW of radar
                             ----->  corrected
                              1858Z: radial spike remnants remaining SE of radar
                             ----->  corrected
**********************************************************************************************
16 Dec 97:    Scattered showers but with more moderate precip than the previous day.
              Data processed:    0002-2359 Z
              Satellite Coincidence:  none
              QC notes:       0627Z: radial spike remnants remaining SW of radar
                             ----->  corrected
   2A         !!FLAG!!   0823-1038Z: ring of decreased reflectivity surrounding radar
                                     where moderate showers are reduced to very weak showers.
                                     Nothing can be done on our end to correct this.
   2A         !!FLAG!!   1145-1458Z: ring of decreased reflectivity surrounding radar
                                     where moderate showers are reduced to very weak showers.
                                     Nothing can be done on our end to correct this.
                         1508-1557Z: second-trip echo remaining SW of radar
                             ----->  corrected
                         1644-2007Z: second-trip echo remaining SW of radar
   2B         !!flag!!       ----->  some very light second-trip remaining in a few of the
                                     VOSs but it is very minor and barely gets a flag.
                         2105-2359Z: second-trip echo remaining SW to S of radar
   2B         !!FLAG!!       ----->  most VOS's are completely cleaned up but their are a
                                     few which still contain some weak second-trip in the
                                     120-150 km range.  All second-trip could not be removed
                                     due to the presence of weak showers.
************************************************************************************************
17 Dec 97:    Widely scattered weak showers throughout the day.
              Data processed:    0000-2355 Z
              Satellite Coincidence:  0200Z, 1321Z
              QC notes:  0000-0918Z: second-trip echo remaining S of radar
   2B         !!FLAG!!       ----->  some VOS's, especially around 05Z, still contain some
                                     second-trip echo which could not be removed.  The second-
                                     trip is very light though.
                         1926-1935Z: second-trip echo remaining S of radar
                             ----->  corrected
************************************************************************************************
18 Dec 97:    Widely scattered showers throughout the day.
              Data processed:    0005-2351 Z
              Satellite Coincidence:  0224Z, 1208Z
              QC notes:       0627Z: radial spike remnants remaining SW of radar
                             ----->  corrected
                              1901Z: radial spike remnants remaining SE of radar
                             ----->  corrected
************************************************************************************************
19 Dec 97:    Scattered showers with a convective cluster to the NW for most of second half
              of the day.
              Data processed:    0001-2357 Z
              Satellite Coincidence:  1056Z
              QC notes:  0131-0150Z: dimming of reflectivities
   3A         !!FLAG!!       ----->  reduction of reflectivities most likely due to solar
                                     calibrations
                              0629Z: radial spike remnants SW of radar
                             ----->  corrected
************************************************************************************************
20 Dec 97:    Widely scattered showers throughout the day
              Data processed:    0006-2027 Z
                                 2201-2359 Z
              Satellite Coincidence:  0135Z, 1120Z
              QC notes:       1901Z: radial spike remnants SE of radar
                             ----->  corrected
***********************************************************************************************
21 Dec 97:    Extremely widely scattered showers (which are ver weak) throughout the day.
              Data processed:    0008-2359 Z
              Satellite Coincidence:  0023Z, 1007Z
              QC notes:       0633Z: radial spike remnants SW of radar
                             ----->  corrected
                              1902Z: radial spike remnants SE of radar
                             ----->  corrected
***********************************************************************************************
22 Dec 97:    Scattered light showers and storms throughout day surrounding radar.
              Data processed:    0009-2359Z
              Satellite Coincidence:  0047Z, 1032Z, 2335Z
              QC notes:       0633Z: radial spike remnant SW of radar
                             ----->  corrected within 150 km range
                              1902Z: radial spike remnant SE of radar
                             ----->  corrected within 150 km range
                              2213Z: radial spike NNW of radar beyond 150 km range.
***********************************************************************************************
23 Dec 97:    Scattered showers and small storms throughout day.  Several thin lines of showers
              and storms develop and pass mainly N of radar.
              Data processed:    0008-2350Z
              Satellite Coincendence:    0919Z, 2222Z
              QC notes:
  3B            !!FLAG!!             0634Z: Radial spike remnant SW of radar with light precip.
                                            Could not be corrected due to presence of precip.  Spike
                                            is mainly, but not entirely beyond 150 km range.
  2A            !!FLAG!!             1509Z: Reflectivities diminish as line of showers moves
                                            directly over radar - NO FIX AVAILABLE.
  3A            !!FLAG!!             1519Z: Reflectivities diminish as line of showers moves
                                            directly over radar - NO FIX AVAILABLE.
  3A            !!FLAG!!             1528Z: Reflectivities diminish as line of showers moves
                                            directly over radar - NO FIX AVAILABLE.
  2A            !!FLAG!!             1538Z: Reflectivities diminish as line of showers moves
                                            directly over radar - NO FIX AVAILABLE.
  3B            !!FLAG!!             1901Z: Radial spike remnant SE of radar with light precip.
                                            Could not be corrected due to presence of precip.  Spike
                                            is mainly, but not entirely beyond 150 km range.
                                     2046-2105Z: overall diminishing of reflectivities probably due
                                                 to radar calibration.
************************************************************************************************
24 Dec 97:    Light scattered showers surrounding radar throughout entire day.  Lines of showers
              with small convective cells more numerous 1110Z --> 2219Z mainly N of radar.
              Data processed:    0000-2356Z
              Satellite Coincidence:   0943Z, 2246Z
              QC notes:       0638Z: radial spike remnant SW of radar with precip.  Spike is
                                     mainly, but not entirely beyond 150 km range.
                              ---->  corrected
   3A         !!FLAG!!        1748Z: weakening of reflectivities when line of showers moves
                                     directly over radar. No fix for this problem.
   3B         !!FLAG!!        1906Z: radial spike SE of radar with light precip.
                                     Could not be corrected due to the presence of weak precip.
                                     Spike is mainly, but not entirely beyond 150 km range.
**************************************************************************************************
25 Dec 97:    Light scattered showers and small convective cells surrounding radar throughout
              entire day.  No organized significant precip.
              Data processed:    0006-2354Z
              Satellite Coincidence:   0831Z, 2134Z
              QC notes:
   2B         !!FLAG!!   0633Z:  radial spike SW of radar - could not be corrected.  Majority
                                 of spike beyond 150 km - some light showers removed by QC
   2B         !!FLAG!!   1905Z:  radial spike remnants SE of radar - could not be corrected.
                                 Majority of spike beyond 150 km.
                         2032-2100Z:  radial spike remnants NW of radar
                         ----->       corrected.
************************************************************************************************
26 Dec 97:    Light scattered showers and small convective cells surrounding radar throughout
              day.  Showers more numerous between 1400Z and 2000Z.
              Data processed:    0003-2356Z
              Satellite Coincidence:   0719Z, 2158Z
              QC notes:   0630Z:      radial spike remnant SW of radar beyond 150 km range.
                          0639Z:      radial spike remnant SW of radar (no precip)
                              ---->   corrected
                          1902Z:      radial spike SE of radar with embedded precip.
                              ---->   corrected
*************************************************************************************************
27 Dec 97:    Light showers surrounding radar from 0640Z --> 1246Z  and from 2046Z --> 2333Z.
              Precipitation was not significant.
              Data processed:    0006-1246Z
                                 2046-2352Z
              Satellite Coincidence:   0742Z, 2045Z
              QC notes:  0221-0240Z:  radial spike remnants remaining
                                ----> corrected
                         0259-0309Z:  second trip echoes NW of radar
                                ----> corrected
                         0319Z:       second trip echo NW of radar - could not correct
  3B          !!FLAG!!         -----> minor coverage and <= 10 dBZ
                         0328-0435Z:  second trip echoes
                                ----> corrected
**********************************************************************************************
28 Dec 97     Light scattered shower activity 0511Z --> 2356Z surrounding radar.
              Line of showers passes S of radar 1741Z.
              Data processed:    0002Z-2356Z
              Satellite coincidence:  0630, 0934
              QC notes:  Dimming of reflectivities 2024Z --> 2043Z
                         0637Z  Radial spike remnants SW of radar beyond 150 km range.
                         1908Z  Radial spike SE of radar
3B      !!FLAG!!        ----->  could not be corrected - moved to bad_files directory
                                therefore not included in TSDIS data.
***********************************************************************************************
29 Dec 97     Light showers and weak convection develop N & W of radar 1001Z --> 1245Z
              Larger, more organized showers and convection oriented SW - NE approaching radar
              from East.
              2027Z --> 2319Z  4 shallow lines of showers and weak convection develop and pass
              over radar from E to W.
              Data processed:    0005-2358Z
              Satellite coincidence:  0654Z, 1956Z
              QC notes:  0639Z: radial spike remnants remaining but most appears
                                to be beyond 150 km and any false echo which does
                                venture inside this range is very weak (<= 10 dB)
                                so it is left alone (so as not to adversely affect
                                precip) and not flagged.
***********************************************************************************************
30 Dec 97     Light showers W of radar from 0008Z --> 0232Z.  Scattered light showers
              surrounding radar from 0720Z --> 2318Z.
              Data processed:   0008-2356Z
              Satellite coincidence :  0541Z, 1844Z
              QC notes:  0641Z radial spike remnants SW of radar
                        -----> corrected
***********************************************************************************************
31 Dec 97     Scattered light showers / small convective storms surrounding radar
              from 09Z --> 18Z.
              Data Processed:   0006-1900Z
                                2114-2358Z
              Satellite Coincidence:   0605Z, 1907Z
              QC notes:   0640Z  radial spike remnant SW of radar -- mainly, but not
                                 entirely beyond 150 km range.
                           --->  corrected within 150 km range.
**********************************************************************************************