On the dependence of winter precipitation types on temperature, precipitation rate and associated features

The phase of precipitation formed within the atmosphere is highly dependent on the vertical temperature profile through which it falls. In particular, several precipitation types can form in an environment with a melting layer aloft and a refreezing layer below. These precipitation types include freezing rain, ice pellets, wet snow, and slush. To examine the formation of such precipitation, a bulk microphysics scheme was used to compare the characteristics of the hydrometeors produced by the model and observed by a research aircraft flight during the 1998 ice storm near Montreal, Canada. The model reproduced several of the observed key precipitation characteristics. Sensitivity tests on the precipitation types formed during the ice storm were also performed. These tests utilized temperature profiles produced by the North American Regional Reanalysis. The results show that small variations (±0.5°C) in the temperature profiles as well as in the precipitation rate can have major impacts on the types of precipitation formed at the surface. These results impose strong requirements on the accuracy needed by prediction models.

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Author Theriault, Julie
Stewart, Ronald
Henson, William
Publisher UCAR/NCAR - Library
Publication Date 2010-07-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:26:30.677650
Metadata Record Identifier edu.ucar.opensky::articles:10568
Metadata Language eng; USA
Suggested Citation Theriault, Julie, Stewart, Ronald, Henson, William. (2010). On the dependence of winter precipitation types on temperature, precipitation rate and associated features. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d79s1rjh. Accessed 21 September 2023.

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