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National Weather Radar Facility
The CSU-CHILL National Weather Radar Facility, located in Greeley, CO, is an advanced, transportable dual-polarized dual-wavelength (S- and X-band) weather radar system. The facility is operated by Colorado State University, under the sponsorship of the National Science Foundation and the University.

Featured Article

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CSU-CHILL X-band reflectivity data in a 1.8 deg elevation angle PPI scan over the portion of the Rocky Mountains located to the west of the radar site in Greeley. The precipitation echoes are due to orographically-enhanced snow produced by a strong westerly flow over the mountains. S-band data collected in RHI scans on the 285 deg azimuth showed evidence of lee waves downstream of the high terrain. (Full Article...)

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Precipitation descending through the melting level. Precipitation descending through the melting level.

CSU-CHILL X-band RHI scan through several shower echos that span the height of the melting level. The precipitation streamers become more vertical as the hydrometeors descend through the melting level due to a combination of changes in the environmental wind with altitude and due to the generally higher fall speed of liquid drops vs. frozen hydrometeors.

Photo credit: Patrick Kennedy
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