ARM
           Southern Great Plains Clouds and Radiation Testbed Site
                       SITE OPERATIONS SITUATION REPORT
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                         Period 09-18-95 to  09-22-95
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General:

     Central Facility Weather conditions:

     Day Date  Sky       Tmax      Wnd Dir   Wnd Spd   Weather 

     Mon  9/18 Sctd/Ovc  27.0 C    SE-S      1-7 M/S   Rain
     Tue  9/19 Brkn/Ovc  26.0 C    SE-N      0-10 M/S  Rain
     Wed  9/20 Sctd/Ovc  18.4 C    NW-N      0-6 M/S   
     Thr  9/21 Ovc       16.1 C    NW-E      0-8 M/S   Drizzle/ L rain
     Fri  9/22 Clr/Ovc   18.8 C    SW-SE     0-2 M/S   AM dew

Severe Weather Events:

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

Day  Date Time      Site           Weather Alert Condition/Event

Mon  9/18 1739      Hillsboro      Yellow - T-Storm Watch
Mon  9/18 2130      Hillsboro      Green - All clear

IOP Status:

ARESE  -  Sept 22 - Oct 20, 95

     Preparation for this integrated IOP continued at an accelerated pace
     this week.  The Penn State Radar, UMass Radar, Univ. of Denver ASTI,
     Russian Radiometers, and the NASA Ozone Sounding System all arrived
     and commenced setup for the ARESE IOP.  The NASA Langley Surface
     Radiometer Network (up to 10 KM from CF) was installed at 4 sites this
     week.

CART Raman Lidar Arrives at SGP.

The Raman Lidar Instrument was successfully activated this week, although
some problems with the Laser were encountered.

Extended Facility Development:
 
The following is the latest revised schedule for EF Instrument
Installation:  (we have delayed 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:

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 mentor requested investigation into why the East and South
          data looked almost identical.  T/S Tuesday found although the
          beam steering interface unit was indicating normal operation, the
          actual control signals were not being sent to the antenna.  The
          cause of this was inside the interface unit and it was sent back
          to Radian for repair.  The 50 WP will be off line until the unit
          is returned.     

     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 9/19 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:   

          Dave Cook was on site on 9/18 to perform calibration testing on
          the current sensors and install/ calibrate new sensors for the
          IOP. The instrument was returned to service on 9/19.   
 
     SMOS:

          Location       Last PM        Status

          CF             9/22/95   Performed preventative maintenance and
                                   all checks were optimal.

          Ringwood, OK   9/11/95   A review of SDS data indicated that the
                                   instrument was operational during the
                                   reporting period.

          Ashton, KS     9/21/95   Performed preventative maintenance and
                                   all checks were optimal.

          Coldwater, KS  9/18/95   Performed preventative maintenance and
                                   all checks were optimal.

          Meeker, OK     9/13/95   A review of SDS data indicated that the
                                   instrument was operational during the
                                   reporting period.

          Elk Falls, KS  9/20/95   Performed preventative maintenance and
                                   all checks were optimal.

          Plevna, KS     9/19/95   Performed preventative maintenance and
                                   all checks were optimal.

          Byron, OK      9/18/95   Performed preventative maintenance and
                                   all checks were optimal.

          Cyril, OK`     9/12/95   A review of SDS data indicated that the
                                   instrument was operational during the
                                   reporting period.

          Larned, KS     9/19/95   Performed preventative maintenance and
                                   all checks were optimal.

Surface Flux Station (EBBR):

     General:  

     Location       Last PM        Status

     CF Lamont, OK  9/22/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    R/R right Hum sensor and tested OK.

          Soil Sensors:            Operational.

          Net Radiometer:          Operational. Removed moisture from
                                   domes. 

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.

     Cement, OK     9/12/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period

     Ringwood, OK   9/11/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period.

     Ashton, KS     9/21/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    Operational.

          Soil Sensors:            Operational.

          Net Radiometer:          Operational.  

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.

     Coldwater, KS  9/18/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    Operational.

          Soil Sensors:            Operational.

          Net Radiometer:          Operational.  

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.

     Meeker, OK     9/13/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period

     Cordell, OK    9/12/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period

     Plevna, KS     9/19/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    Operational.

          Soil Sensors:            Operational.

          Net Radiometer:          Operational.  

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.

     Pawhuska, OK   9/13/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period.

     Elk Falls, KS  9/20/95   Performed preventative maintenance.  

          AEM Temp/Hum Sensors:    Operational

          Soil Sensors:            Operational.

          Net Radiometer:          Operational. R/R 1/4 desiccant.  

          Barometer/Wind Sensors:  Operational. 

          Data Collection Equip:   Operational.

Radiometers:
     
     16 Channel MFRSR (Central Cluster):     

          Operational as of 9/19 2030 GMT.  

     BSRN:     
          
          Off line communications problem.  T/S continues.
     MWR:

          Central Facility:   Operational for the reporting period. 
                              Continued T/S with the mentor on the IRT
                              communications with the laptop computer. 
                              Suspect the communications port on the laptop
                              itself.  Will continue to work on this
                              problem as time and manpower allows.

          Boundary Facilities:

               Hillsboro:     Operational during the reporting period.   

               Morris:        Operational during the reporting period.   

               Vici:          Operational during the reporting period.

               Purcell:       Operational during the reporting period.   

     SIROS:         
                    Last PM        Status

          CF:       9/22/95   Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             Operational.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    T/S found the connector on the interface
                                   board reversed.  Corrected and tested
                                   OK.

               NIP:                Operational. 

               MFRSR:              Operational. 

               Sun Tracker:        Operational.   

          Ringwood: 9/11/95   A review of SDS data indicated that there may
                              be a problem with the DD radiometer.  Next PM
                              visit on 9/25.
          
          Ashton:   9//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.   
          
          Meeker:   9/13/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period.

          Cordell:  9/12/95   A review of SDS data indicated that the US
                              radiometer is bad (-4095).  Next PM visit on
                              9/26.
               
          Elk Falls: 9/20/95  Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             Operational.

               PSP/DS:             Operational.  R/R desiccant and leveled.

               PSP/DD (Shaded):    Operational.

               NIP:                Operational. 

               MFRSR:              Operational.  Replaced the interface
                                   board with new revision provided by the
                                   mentor.  Re-leveled the sensor. 

               Sun Tracker:        Operational.   

          Plevna:   9/19/95   Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             R/R amp cable and tested OK.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    Operational.

               NIP:                Operational. 

               MFRSR:              R/R data logger and tested OK.  Replaced
                                   the interface board with new revision
                                   provided by the mentor. 

               Sun Tracker:        Operational.

          Coldwater: 9/18/95  Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             Operational.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    Operational.

               NIP:                Operational. 

               MFRSR:              Operational.  Replaced the interface
                                   board with new revision provided by the
                                   mentor. 

               Sun Tracker:        Operational.    

          Pawhuska: 9/13/95   A review of SDS data indicated that the
                              instrument was operational but the data
                              collected was garbled. The data stopped all
                              together on 9/25.  Next PM visit on 9/28.

          Vici:     9/11/95   A review of SDS data indicated that the
                              instrument was operational during the
                              reporting period.

          Byron:    9/18/95   Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             Operational.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    Operational.

               NIP:                Operational. 

               MFRSR:              Operational.  Replaced the interface
                                   board with new revision provided by the
                                   mentor. 

               Sun Tracker:        Operational.   

          Tyro:     9/20/95   Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             R/R amp cable and tested OK.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    Operational.

               NIP:                Operational. 

               MFRSR:              SDS could not link with data logger.
                                   Power cycled and tested OK.  Replaced
                                   the interface board with new revision
                                   provided by the mentor. 

               Sun Tracker:        Operational.

          Cyril:    8/29/95   A review of SDS data indicated that no data
                              has been collected this week.  Next PM visit
                              on 9/27. 

          Larned:   9/19/95   Performed preventative maintenance.

               PIR/UIR:            Operational.

               PIR/DIR (Shaded):   Operational.

               PSP/US:             Operational.

               PSP/DS:             Operational.

               PSP/DD (Shaded):    Operational.

               NIP:                Operational. 

               MFRSR:              Operational.  Replaced the interface
                                   board with new revision provided by the
                                   mentor. 

               Sun Tracker:        Operational.        

     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:          9/11/95        Operational status unknown.

     Byron:         9/18/95        Performed preventative maintenance and
                                   change out of the data disk.

                    Hygrometer:    Off line.  No spares available.

                    Sonic Sensor:  Operational. 

                    DCU:           Operational.  Had a catastrophic error
                                   during disk change out.  Could not
                                   communicate with the DCU.  R/R and
                                   tested OK.

     Tyro:          9/20/95        Performed preventative maintenance and
                                   change out of the data disk.

                    Hygrometer:    Operational.

                    Sonic Sensor:  Operational. 

                    DCU:           Operational.

     Cyril:         9/12/95        Operational status unknown.

     Larned:        9/19/95        Performed preventative maintenance and
                                   change out of the data disk.

                    Hygrometer:    Off line. No spares available.

                    Sonic Sensor:  Operational. 

                    DCU:           Operational.

     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 for the reporting period.

          SGP CART Instrument:

               The CART instrument was installed by Stan Scott last week. 
               We understand that data from this new system will be
               collected and stored within the instrument computer during
               the ARESE IOP.  The program was having difficulty staying
               operational during the week.  Site operations re-booted the
               instrument several times.  The mentor requested site ops to
               correct a software error and this was successful.  The
               instrument was Operational as of Friday 9/22.
     
     Raman Lidar System:

          The instrument arrived at the SGP CF on Wednesday 9/13/95 and was
          placed on it's permanent concrete mounting pad at IDP3 on
          Thursday 9/14/95.   Setup and activation of the instrument for
          ARESE continued this week.

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 mentor has requested no operation of the instrument until
          further notice.  The instrument continues to remain off line
          during this reporting period.

     SORTI01:

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

Aerosol Observation System:

     Construction of the facility has begun with the excavation and pouring
     of concrete footers to support the stack guy wires.  Six 30 inch
     diameter holes, six feet deep were dug around the Aerosol Trailer, and
     filled with concrete.  The construction contractor will return on
     September 25 to start construction and installation of the stack
     assemblies.

Calibration Facility:

     Design work continues on this system.