ARM
           Southern Great Plains Clouds and Radiation Testbed Site
                       SITE OPERATIONS SITUATION REPORT
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                         Period 09-25-95 to  09-29-95
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General:

     Central Facility Weather conditions:

     Day Date  Sky       Tmax      Wnd Dir   Wnd Spd   Weather 

     Mon  9/25 Sctd/Ovc  23.0 C    SE-NW     0-3 M/S   Rain/ drizzle
     Tue  9/26 Clr/Sctd  27.0 C    SE-SW     1-5 M/S   Dew/ fog
     Wed  9/27 Clr/Ovc   22.0 C    E-SE      1-6 M/S   Dew/ fog
     Thr  9/28 Clr/Ovc   30.0 C    E-SE      2-6 M/S   Fog/ haze
     Fri  9/29 Sctd/Ovc  31.0 C    SE-SW     1-10 M/S  Rain/ gusty
     Sat  9/31 Clr/Brkn  30.0 C    SE-NW     3-10 M/S  Rain/ lightning
     Sun  10/1 Clr/Sctd  30.0 C    E-NW      0-8 M/S   

Severe Weather Events:

The following severe weather events were noted this week: (Times are GMT):

Day  Date Time      Site           Weather Alert Condition/Event

Wed  9/27 1100      Purcell        Yellow - T-Strms
Wed  9/27 1400      Purcell        Green - All clear

Fri  9/29 0142      Vici           Yellow -T-Strms
Fri  9/29 0317      Vici           RED - Evacuated the site
Fri  9/29 0710      Vici           Green - All clear
Fri  9/29 0905      Hillsboro      Yellow - T-Storm Watch
Fri  9/29 1110      Hillsboro      Green - All clear

Sat  9/30 0500      Hillsboro      Yellow - T-Strms
Sat  9/30 0910      Hillsboro      Green - All clear

IOP Status:

ARESE  -  Sept 22 - Oct 20, 95

     The SCM portion of this integrated IOP commenced with the 1430 GMT
     sonde launch from the CF and 4 Boundary Sites on Friday 22 September
     95.

     The following sonde launch statistics are provided:

     Period Sept 22 1430 GMT through 2030 GMT launch Thursday 28 September.

     Scheduled      Actual    Missing   Less Than 
     Soundings      Soundings Soundings 10 KM     Comments

     254            252         2       3         1 Equip, 1 Operator
                                                  Problem.

     Status of ARESE Visiting Instruments:

     Penn State Radar         Part were received and the radar was returned
                              to operational on Friday 9/29/95.

     UMass Radar              Operational

     Russian Instruments      Operational

     U of Denver ASTI         Operational

     NASA Ozone Sondes        Still having problems with interference and
                              missing data on soundings.  Telephone
                              Technical support from NASA has been
                              extensive.  Latest word is that the system
                              Technician will return to SGP to troubleshoot
                              the receiver.

     Honer                    Not yet here.  Expected to arrive Monday
                              10/2/95.

     Volero Radiometers       Not installed as of Oct 2.  At the Blackwell
                              Tonkawa Airport but still missing some
                              critical components.

ARESE Critical SIROS Sites:
     
     Site Operations activated Triage Maintenance Teams to travel to the
     Byron, Coldwater, Ringwood, and Vici EF's to perform critical
     maintenance on the SIROS Instruments.  The Triage Teams made 3 trips
     to the Byron EF this week and corrected a wiring problem, replaced the
     MFR sensor head, and replaced the interface board twice.  The Triage
     Teams made 2 trips to the Coldwater Kansas EF and corrected a wiring
     problem, and replaced the EFS Modem twice.  On Monday 9/25/95
     troubleshooting found and corrected a loose wire on the terminal strip
     for the PSP-DD.  A normal scheduled PM trip to Vici on Monday 9/25/95
     resulted in replacement of the MFR Sensor Head that was reported to
     have one bad channel.  We subsequently have learned that the
     replacement sensor has two bad channels, and is again scheduled for
     replacement.  

Extended Facility Development:
 
The following is the latest revised schedule for EF Instrument
Installation:  (we are delaying the Towanda and Leroy instrument
installations until after ARESE).

Site           Date
Byron, OK      Jun 20-23 - Complete
Pawhuska, OK   Jun 27-29 - Complete
Tyro, KS       Jul 18-21 - Complete
Cyril, OK      Aug 22-25 - Mostly complete.
Larned, KS     Aug 29-Sep 1 - Mostly complete.
Hillsboro, KS  Sep 5-7 - Mostly complete
Towanda, KS    Oct 24-27 - Install SIROS, SMOS, EC
Leroy, KS      Oct 31-Nov 3 - Install SIROS, SMOS, EC
Morris, OK     Nov 7-10 - Install SIROS, EBBR
Ft. Cobb, OK   Nov 13-15 - Install SIROS, EC
Halstead, KS   Nov 27-Dec 5 - Install SIROS, EC, SMOS
Seminole, OK   Jan 17-22 - Install SIROS, EBBR
Okmulgee, OK   Feb 14-20 - Install SIROS, EC, SMOS

Other Site CART Development:

The concrete pad construction for installation of the Raman Lidar was
completed this week.  The instrument is scheduled to arrive next week on
Wednesday 9/13/95.

Other SGP CART site development activities are planned for the following
schedules:

     Trailer pad construction at Hillsboro BF     Sep 11-15 (Complete)
     Installation of Aerosol System Structure     Sep 25-29
     Trailer pad construction at Morris BF        Oct 23-27
     Trailer pad construction at Vici BF          Oct 30-Nov 3
     Installation of new BF Trailers              Dec 1-29
     Installation of BF T-1 Lines                 Jan 2-30

Weekly Status of Site Instrument Systems:

     915 Profiler/RASS:  
     
          Operational during the reporting period.  

     50 Mhz Profiler/RASS:    

          The 50 WP will be off line until the Beam Control unit is
          returned.  The Vendor has no spares and is making repairs to the
          component that we shipped to them.

     BBSS:     Barry Lesht (ANL) and Chris Keenan of Vaisala will be
               visiting all of the SGP CART sites during the first week of
               October to perform fine tuning of the Vaisala BBSS systems.      

          CF:            Operational during the reporting period. On
                         Tuesday 9/26 the 1730 launch was skipped to allow
                         the Ozone sonde to launch at 402 MHz.  

          Hillsboro:     Operational during the reporting period.
                         
          Vici:          Operational during the reporting period.

          Morris:        Operational during the reporting period.

          Purcell:       Operational during the reporting period.

     60 Meter Tower Temp/Hum Sensors:   

          Operational during the reporting period.   
 
     SMOS:

          Location       Last PM        Status

          CF             9/22/95   A review of SDS data indicated that the
                                   instrument was operational during the
                                   reporting period.

          Ringwood, OK   9/25/95   Performed preventative maintenance.  R/R
                                   the snow depth sensor and tested OK. 
                                   All other checks were optimal.

          Ashton, KS     9/21/95   A review of SDS data indicated that the
                                   instrument was operational during the
                                   reporting period.

          Coldwater, KS  9/18/95   A review of SDS data indicated that the
                                   instrument was operational during the
                                   reporting period.

          Meeker, OK     9/27/95   Performed preventative maintenance and
                                   all checks were optimal.

          Elk Falls, KS  9/20/95   A review of SDS data indicated that the
                                   instrument was operational during the
                                   reporting period.

          Plevna, KS     9/19/95   A review of SDS data indicated that the
                                   instrument was operational during the
                                   reporting period.

          Byron, OK      9/18/95   A review of SDS data indicated that the
                                   instrument was operational during the
                                   reporting period.

          Cyril, OK`     9/26/95   Performed preventative maintenance and
                                   all checks were optimal.

          Larned, KS     9/19/95   No data being collected by the SDS.

Surface Flux Station (EBBR):

     General:  

     Location       Last PM        Status

     CF Lamont, OK  9/22/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period

     Cement, OK     9/26/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    Operational.

          Soil Sensors:            Operational.

          Net Radiometer:          Operational.  

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.  SDS is experiencing data
                                   collection problems with this site.  The
                                   battery voltage drops to 10 Vdc early in
                                   the morning.  No apparent problems were
                                   found during the PM.  Site ops will keep
                                   an eye on this problem.

     Ringwood, OK   9/25/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    Operational.

          Soil Sensors:            Operational.

          Net Radiometer:          Operational.  

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.

     Ashton, KS     9/21/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period

     Coldwater, KS  9/18/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period

     Meeker, OK     9/27/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    Operational.

          Soil Sensors:            Operational.

          Net Radiometer:          Operational.  

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.

     Cordell, OK    9/26/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    Operational.

          Soil Sensors:            Operational.

          Net Radiometer:          Operational.  

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.

     Plevna, KS     9/19/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period

     Pawhuska, OK   9/27/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    Operational.

          Soil Sensors:            Operational.

          Net Radiometer:          Operational.  

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.

     Elk Falls, KS  9/20/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period

Radiometers:
     
     16 Channel MFRSR (Central Cluster):     

          Operational during the reporting period.

     BSRN:     
          
          T/S found a bad SC32A interface Thursday. R/R and tested OK.
          Operational as of 9/28 1700 GMT.
     
     MWR:

          Central Facility:   Operational for the reporting period.  No
                              progress with the IRT communications problem
                              yet.

          Boundary Facilities:

               Hillsboro:     Operational during the reporting period.   

               Morris:        Operational during the reporting period.   

               Vici:          Operational during the reporting period.

               Purcell:       The system required a re-boot on Wednesday
                              9/27.  Operational for the rest of the
                              reporting period.   

     SIROS:         
                    Last PM        Status

          CF:       9/22/95   A review of SDS data indicated that the DD
                              Radiometer values were low.  T/S on Monday
                              found a loose wire on the DD junction box
                              terminal strip.  Corrected and tested OK. The
                              instrument was operational during the rest of
                              the reporting period.

          Ringwood: 9/25/95   Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             Operational.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    Operational.

               NIP:                Operational. 

               MFRSR:              Operational. 

               Sun Tracker:        Operational.
          
          Ashton:   9/21/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period.
          
          Meeker:   9/27/95   Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             Operational.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    Operational.

               NIP:                Operational. 

               MFRSR:              Operational. 

               Sun Tracker:        Found in the home position.  T/S
                                   adjusted the limit switch and restarted
                                   OK.  No fine adjustment could be made
                                   due to the lack of sunlight.

          Cordell:  9/26/95   Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.  R/R the desiccant.

               PSP/US:             T/S found the interface board bad.  R/R
                                   and tested OK.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    Operational. R/R the desiccant.

               NIP:                Operational. 

               MFRSR:              Operational. 

               Sun Tracker:        Found the tracker in the home position.
                                   T/S found nothing.  Re-started and
                                   tested OK.
               
          Elk Falls: 9/20/95  A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period however the PSP radiometer
                              values seem low.

          Plevna:   9/19/95   A review of SDS data indicated that the UIR
                              and US amp cables are bad.  Next PM visit is
                              on 10/4.

          Coldwater: 9/18/95  A review of SDS data indicated a
                              communications problem.  R/R EF modem on 9/25
                              and tested bad.  Returned on 9/27 and
                              replaced the modem again and tested OK.  The
                              instrument was operational during the rest of
                              the reporting period.

          Pawhuska: 9/27/95   Performed preventative maintenance.  The
                              phone line to this site is out.  The phone
                              company was notified but as of 10/2 the SDS
                              still cannot communicate with the site. 

               PIR/UIR:            Operational.  R/R desiccant on 9/28.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             T/S found the signal wires swapped.
                                   Corrected and tested bad.  R/R preamp
                                   cable on 9/28 and tested OK.  R/R
                                   desiccant.

               PSP/DS:             T/S found the signal wires swapped.
                                   Corrected and tested OK.

               PSP/DD (Shaded):    T/S found the signal wires swapped.
                                   Corrected and tested bad. R/R amp cable
                                   on 9/28 and tested OK.

               NIP:                T/S found the signal wires swapped.
                                   Corrected and tested bad.  R/R preamp
                                   cable and tested OK.

               MFRSR:              Operational. 

               Sun Tracker:        Operational.

          Vici:     9/25/95   Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             Operational.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    Operational.

               NIP:                Operational. 

               MFRSR:              T/S found the MF Radiometer sensor bad.
                                   R/R and tested OK on site. 

               Sun Tracker:        Operational.

          Byron:    9/18/95   A review of SDS data indicated that the
                              DD/DS/US/NIP values were all bad. T/S on 9/26
                              found the signal wires swapped.  Corrected
                              and tested OK.  SDS showed the UIR case/ dome
                              voltages at a constant 2.5 Vdc.  T/S found a
                              blown fuse on the MFR interface board.  R/R
                              and tested OK.  The instrument was
                              operational during the rest of the reporting
                              period.

          Tyro:     9/20/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period.

          Cyril:    9/26/95   This site is not yet completed.  No
                              maintenance is required at this time. 

          Larned:   9/19/95   This site is not yet completed.  No
                              maintenance is required at this time.

     Hillsboro:     9/6/95    This site is not yet completed.  No
                              maintenance is required at this time.

Central Facility 25 Meter Tower Upwelling Radiometers 
          (MFR, PIR/UIR, PSP/US):

     A review of SDS data indicated that the instrument was operational
     during the reporting period.  

Central Facility 10 Meter Tower Upwelling MFR:

     Down still missing sensor/logger, awaiting parts to repair.

Ceilometer:

     Belfort Ceilometer: 

          Operational during the reporting period.  

Whole Sky Imager:

     Scripps Loaner Instrument:

          This instrument was removed from service on 9/20 by the mentor.  

     SGP CART Instrument:

          Operational during the reporting period.  One of the data tape
          drives failed during system acceptance testing.  Awaiting
          replacement.  Site operations is currently reviewing the
          documentation and training on this system.

Eddy Correlation:

     Type C2 Systems (3 Meter Tower at EF's):

     Site           Last PM        Status
          
     CF:            9/22/95        The system is off line awaiting parts
                                   for the DC power distribution board.

     Vici:          9/25/95        Performed preventative maintenance and
                                   change out of the data disk.

                    Hygrometer:    Operational.

                    Sonic Sensor:  Operational. 

                    DCU:           Operational.

     Byron:         9/18/95        Unable to determine status remotely.

     Tyro:          9/20/95        Unable to determine status remotely.

     Cyril:         9/26/95        Performed preventative maintenance and
                                   change out of the data disk.

                    Hygrometer:    Operational.

                    Sonic Sensor:  Operational. 

                    DCU:           Operational.

     Larned:        9/19/95        Unable to determine status remotely.

     Type C1 Systems (60 Meter Tower at CF):

          Initial PRR has been completed by the Mentor and review comments
          have been completed.  Installation dates are not yet established.

     Type C3 Systems (Mobile):

          The initial PRR has been completed by the Mentor and review
          comments have been completed.  The Instrument is currently stored
          at the Central Facility.  Activation to operations is not yet
          scheduled.

Lidars:

     Micro Pulse Lidar:
 
          NASA Loaner Instrument:  

               Operational during the reporting period.

          SGP CART Instrument:

               Operational for the reporting period.
     
     Raman Lidar System:

          The Raman Lidar has been experiencing Laser component failures
          this week and as of Friday, the instrument remains down.  The
          Laser vendor is scheduled to arrive on site (second trip) to make
          repairs next Monday 10/2/95.

Other Radar Systems:

     Millimeter Cloud Radar System:

          The PRR/ORR Master Schedule indicates a target installation Dec
          21-28, 95.

     Intermediate Facility 915 Mhz RWP/RASS.

          Site location and lease initiation activities have continued for
          the 3 new intermediate facilities. 

Infrared Interferometers:

     AERI01:

          Operational during the reporting period.   
          
     SORTI00:

          The instrument continues to remain off line during this reporting
          period awaiting parts.

     SORTI01:

          The initial PRR has been completed by the Mentor and is currently
          in review.

Aerosol Observation System:

     Construction of the facility continued this week and the Aerosol Stack
     assembly and stairs were installed.  The roof penetration by the stack
     was completed this week.  The winch for raising/lowering the stack has
     not yet arrived.

Calibration Facility:

     Design work continues on this system.