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A climatology (climatological description of spatial, temporal, and synoptic characteristics) of snow events with thunder is presented for the contiguous United States. Based upon 30 yr of 3-hourly reports from 204 stations in the 48 contiguous United States, 229 reports are extracted from the 3-hourly observations (consistently bearing the present-weather group in each surface observation) that featured thunder with snow only. When these reports are plotted spatially, the central United States, the intermountain west, and the Great Lakes region emerge as the preferred regions for thundersnow occurrence. A thundersnow event is then defined. Isolated thundersnow reports clearly constitute a thundersnow event. Also, multiple thundersnow reports that are not separated spatially by over 1100 km or temporally by 6 h are considered part of one event. The location reporting the first occurrence of thunder with snow in such a collection of stations then carries the representative time and location for the event. The 229 individual reports make up 191 thundersnow events. Temporal analysis of thundersnow events reveals a nationwide seasonal preference for occurrence in March but no clear diurnal preference. Most thundersnow events are typically reported at only one station and only rarely in consecutive 3-hourly observations. These results thus reinforce the notion of thundersnow as a fairly localized phenomenon of limited duration. In terms of intensity, the thundersnow events investi ... www.refdoc.fr...
Originally posted by ~Lucidity
Have you ever heard thunder during a snowstorm?