The CSU-CHILL National Weather Radar Facility, located in Greeley, CO, is an advanced, transportable dual-polarized S-band weather radar system. The facility is operated by Colorado State University, under the sponsorship of the National Science Foundation and the University.
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CSU-CHILL X-Band (9 GHz) reflectivity data observed in an extensive snow band on 15 April 2013. Beam intersection angles between the CSU-CHILL and NWS KFTG radars were large enough to permit dual-Doppler wind syntheses to be done in the vicinity of the intersecting red lines. Selected dual-Doppler and CSU-CHILL X-Band RHI plots of the snow band data have been assembled.
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Intense sunshine around mid-day on 23 April 2013 caused the rapid sublimation / melting of several inches of snow that had fallen overnight. Condensation produced a widespread layer of "steam fog" just above the moist surface of a plowed field immediately south of the CSU-CHILL radar. On several brief occasions, the intense surface-based thermal instability caused the fog layer to organize into rotating "devils".
