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Strong Coastal Storm to Impact Mid-Atlantic to New England through Thursday

A rapidly intensifying storm developing across the Mid-Atlantic will move quickly into New England by Thursday. The storm will produce heavy rainfall and localized flooding across these areas. Additionally, strong winds may cause some tree damage and power outages through Thursday. Elsewhere, elevated to critical fire weather conditions are forecast across the Great Basin and Central Rockies. Read More >



Severe weather season across western South Dakota and northeastern Wyoming is relatively short compared to much of the Plains and eastern U.S. but also relatively active. Typically, the Rapid City weather forecast office issues around 300 Severe Thunderstorm and Tornado Warnings per year (shown at left), with the majority coming from late May through August. As a result, during most years, we are among the top ten offices in terms of warnings issued. In 2018, our count of 394 was sixth in the country.

This climatology page will provide a look at our typical annual and diurnal cycles of Severe Thunderstorm and Tornado Warnings and their associated hazards: large hail, damaging straight-line winds, and, of course, tornadoes.

Many of the images herein are courtesy of Daryl Herzmann at the Iowa Environmental Mesonet, while data for the climatology was provided by the Storm Prediction Center and, specifically, Andy Dean. If you have any questions or suggestions for additions, please e-mail those to our meteorologist maintaining this page, Keith Sherburn.

Total Severe Thunderstorm and Tornado Warning count by year for our county warning area, since 1986. Note the large increase in warning count in the mid 1990s associated with the NWS "modernization" and the installation of the WSR-88D network. Credit Daryl Herzmann at the Iowa Environmental Mesonet (



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