Mountain-Top Riming at Sites in California and Nevada, U.S.A.

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Abstract
Icing at locations near Lake Tahoe and in northern California appears to be soft or hard rime. At one site during three recent winters, and at six other locations during the winter of 1986/87, riming was common, occurring on average during 38% of winter days between November and April. On an hourly basis, rime occurred during 19% of the 17,850 h of observation at five locations. Rime and precipitation were often concurrent, with precipitation occurring during, or within 4 h of riming three times as often as riming alone. Rime occurrence was often synchronous at the sampling sites around Lake Tahoe, 40% of the time being concurrent at two or more sites. Riming intensity, as indexed by deicing cycles of Rosemount ice detectors at five sites near Lake Tahoe, was much lower than at sites in the northeastern United States. An algorithm developed through discriminant analysis correctly classified independent observations of riming over 82% of the time. The absence of riming was correctly classified in over 92% of the cases. First approximations of water equivalent contributed by rime ranged from 14 to 66% of recipitation recorded during comparable periods at four sites around Lake Tahoe during the 1986/87 winter.

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