|Equipment Operational Start Dates|
|5 June||After 5 June|
|NCAR S-POL S-band Radar|
CSU CHILL S-band Radar
UCAR/COSMIC 15 GPS Receivers
Radiometrics 12-Channel Radiometer
Denver NEXRAD (KFTG) S-band Radar (via LDM)
ENVISAT Advanced Synthetic Aperature Radar (ASAR) (14 June and 19 July)|
CSU Pawnee S-band Radar (anticipated 19 June)
CSU Mini-Radiometers (anticipated 19 June)
NCAR/U. of S. Dakota (Radiometrics) 5-Channel Radiometer (anticipated 19 June)
Denver NEXRAD (KFTG) ORDA access (anticipated 27 June)
CASA/NSSL X-band radar (1 July)
Surface Mesonets |
NCAR Campbell surface stations
GOES Satellite imagery
RUC model output
DIAL Lidar and tethersonde (will not be available)
REFRACTT includes scientific research and operational application goals. Both have the goal of greatly enhancing the observed field of water vapor over the nation thus leading to improved precipitation forecasts
The scientific goal is to utilize multiple radars and GPS receivers to simultaneously obtain very high resolution measurements of water vapor variability and transport in the convective boundary layer and to assess potential improvements these enhanced water vapor measurements may have in numerical model forecasts of quantitative precipitation.
The applications goal is to demonstrate the ability to collect radar refractivity data on the NEXRAD (WSR-88D) radars and to demonstrate the forecast value of this field to NWS forecasters. The ultimate goal is to implement radar refractivity measurements on the national network of operational radars.
Time series phase information will be collected from four radars, CSU's CHILL and Pawnee radars, the NCAR S-Pol radar and the NWS Denver NEXRAD (KFTG) radar to produce refractivity fields.
In Colorado, there are approximately 15 GPS receivers located along the Front Range and over the High Plains of NE Colorado. Another 4 stations are planned in time for the field phase for a total network of 19 GPS receivers.
The NCAR Mobile GPS Advanced Upper-Air Sounding System (MGAUS) will be deployed to specific locations to obtain soundings on either side of tight horizontal water vapor gradients and to a variety of other locations to help obtain representative measures of vertical water vapor profiles to correlate with the near surface refractivity measurements.
Additionally, there is the possibility of using ENVISAT ASAR (Advanced Synthetic Aperture Radar) data to measure refractivity from space. There may be two opportunities during the field phase to have satellite overpasses (14 June and 19 July). Click here for further information about the ENVISAT overpasses.
Additional possible instrumentation includes the DIAL Lidar, two Mini Radiometers,
two Corner Reflectors, an NCAR Disdrometer, the CASA X-Band Radar, and
the rapid scan Doppler on Wheels (DOW).