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The Regional Snowfall Index (RSI) is a system used by NOAA to assess the societal impact of
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The Regional Snowfall Index (RSI) is a system used by NOAA to assess the societal impact of winter storm
A winter storm is an event in which wind coincides with varieties of precipitation that only occur at freezing temperatures, such as snow, mixed snow and rain, or freezing rain. In temperate continental climates, these storms are not necessa ...
s in the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
. The system is a replacement for the Northeast Snowfall Impact Scale
The Northeast Snowfall Impact Scale (NESIS) was created to measure snowstorms in the U.S. Northeast in much the same way the Saffir-Simpson Hurricane Scale records hurricane intensity and the Enhanced Fujita Scale with tornadoes.
The Scale
NES ...
(NESIS) system which, unlike the former; assesses winter storm
A winter storm is an event in which wind coincides with varieties of precipitation that only occur at freezing temperatures, such as snow, mixed snow and rain, or freezing rain. In temperate continental climates, these storms are not necessa ...
impacts outside of the Northeastern United States. Since its initiation the NCDC has retroactively assigned RSI values to over 500 historical storms since 1900.
Storms are ranked from Category 0 to 5 on the scale; with the former being classified as "Nuisance" and the latter as "Extreme". The impact of the storms is assessed in six different regions of the United States: the Northeast, Northern Rockies and Plains, Ohio Valley, South, Southeast and the Upper Midwest. A Category 5 ''Extreme'' ranking is indicated by a numerical score of 18 or higher on the scale.
Out of the over 500 historical storms assessed since 1900, only twenty-six storms have been given a Category 5 ranking. The highest ranking storm on the list is the Great Blizzard of 1978 which scored a value of 39.07. The most recent storm to receive a Category 5 ranking is the January 2016 United States blizzard
The January 2016 United States blizzard was a blizzard that produced up to 3 ft (91 cm) of snow in parts of the Mid-Atlantic and Northeastern United States from January 22–24, 2016. Evolving from a shortwave trough that formed in the Pacific ...
which scored a value of 20.14. The following list orders the storms chronologically.
List of Category 5 events
Listed by month
See also
*List of Regional Snowfall Index Category 4 winter storms
The Regional Snowfall Index (RSI) is a system used by NOAA to assess the societal impacts of winter storms in the United States. The scale is a replacement for the Northeast Snowfall Impact Scale (NESIS) system, which was used for winter storms j ...
*List of Northeast Snowfall Impact Scale winter storms
The Northeast Snowfall Impact Scale (NESIS) is a scale used to categorize winter storms in the Northeast United States. The scale was developed by meteorologists Paul Kocin and Louis Uccellini, and ranks snowstorms from Category 1 ("notable") to C ...
*List of blizzards
This is a list of blizzards, arranged alphabetically by continent. A blizzard is defined as a severe snowstorm characterized by strong sustained winds of at least and lasting for three hours or more. The list states blizzards in various countries ...
References
{{reflist Climate of the United States winter storms Weather events in the United States