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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

13jun2016 4.5km CAPPi anot.png

CSU-CHILL S-band data interpolated to the 4.5 km MSL constant height surface. While the reflectivity levels in the two thunderstorms are generally similar, only the northern storm has an area of positive Zdr values at this height. Other plots showing additional contrasting characteristics of these two storms have been prepared. (Full Article...)

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Zdr depression. Zdr depression.

The appearance of the positive Zdr values associated with oblate raindrops does not occur until lower heights are reached in a precipitation shaft at 15 km range. This Zdr depression is a consequence of the longer time (and greater fall distance) necessary to fully melt more massive ice particles.

Photo credit: Patrick Kennedy
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