List of regional snowfall index category 5 winter storms: Difference between revisions
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Storms are ranked from Category 1 to 5 on the scale; with the former being classified as ''Notable'' 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.<ref name="RSI">{{cite web|title=Regional Snowfall Index (RSI)|url=http://www.ncdc.noaa.gov/snow-and-ice/rsi/|website=NOAA: National Centers for Environmental Information|accessdate=16 February 2016}}</ref> A Category 5 ''Extreme'' ranking is indicated by a numerical score of 18 or higher on the scale. |
Storms are ranked from Category 1 to 5 on the scale; with the former being classified as ''Notable'' 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.<ref name="RSI">{{cite web|title=Regional Snowfall Index (RSI)|url=http://www.ncdc.noaa.gov/snow-and-ice/rsi/|website=NOAA: National Centers for Environmental Information|accessdate=16 February 2016}}</ref> A Category 5 ''Extreme'' ranking is indicated by a numerical score of 18 or higher on the scale. |
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Out of the over 500 historical storms assessed since 1900, only seventeen storms have been given a Category 5 ranking. The highest ranking storm on the list is the [[Great Appalachian Storm of November 1950]] which scored a value of 32.31. The most recent storm to receive a Category 5 ranking is the [[January 2016 United States blizzard]]. The following list orders the storms chronologically.<ref name=RSI/><ref name=rsiostorms>{{cite web|url=http://www.ncdc.noaa.gov/snow-and-ice/rsi/societal-impacts||title=Regional Snowfall Index and Societal Impacts|accessdate=2014-11-18}}</ref><ref name=Americangardens>{{cite web|url=http://www.publicgardens.org/content/noaa-product-highlight-regional-snowfall-index|title=NOAA Product Highlight: Regional Snowfall Index|accessdate=2014-11-18}}</ref> |
Out of the over 500 historical storms assessed since 1900, only seventeen storms have been given a Category 5 ranking. The highest ranking storm on the list is the [[Great Appalachian Storm of November 1950]] which scored a value of 32.31. The most recent storm to receive a Category 5 ranking is the [[January 2016 United States blizzard]]. The following list orders the storms chronologically.<ref name=RSI/><ref name=rsiostorms>{{cite web|url=http://www.ncdc.noaa.gov/snow-and-ice/rsi/societal-impacts||title=Regional Snowfall Index and Societal Impacts|accessdate=2014-11-18}}</ref><ref name=Americangardens>{{cite web|url=http://www.publicgardens.org/content/noaa-product-highlight-regional-snowfall-index |title=NOAA Product Highlight: Regional Snowfall Index |accessdate=2014-11-18 |deadurl=yes |archiveurl=https://web.archive.org/web/20141129095943/http://www.publicgardens.org/content/noaa-product-highlight-regional-snowfall-index |archivedate=2014-11-29 |df= }}</ref> |
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==List of Category 5 events== |
==List of Category 5 events== |
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Revision as of 23:42, 22 May 2017
The Regional Snowfall Index (RSI) is a system used by NOAA to assess the societal impact of winter storms in the United States. The system is a replacement for the Northeast Snowfall Impact Scale (NESIS) system which, unlike the former; assesses winter storm 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 1 to 5 on the scale; with the former being classified as Notable 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.[1] 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 seventeen storms have been given a Category 5 ranking. The highest ranking storm on the list is the Great Appalachian Storm of November 1950 which scored a value of 32.31. The most recent storm to receive a Category 5 ranking is the January 2016 United States blizzard. The following list orders the storms chronologically.[1][2][3]
List of Category 5 events
| Year | Date | Max. RSI | Region |
|---|---|---|---|
| 1921 | February 17–21 | 22.88 | South |
| 1927 | April 4–9 | 27.58 | Rocky Mountains and Plains |
| 1929 | December 18–23 | 18.29 | South |
| 1950 | November 11–21 | 32.31 | Ohio Valley |
| 1969 | February 21–27 | 26.42 | Northeast |
| 1978 | January 22–27 | 25.84 | Upper Midwest |
| 1978 | February 5–7 | 18.42 | Northeast |
| 1984 | April 24–27 | 21.44 | Rocky Mountains and Plains |
| 1985 | February 6–14 | 19.53 | Upper Midwest |
| 1985 | November 27 – December 1 | 19.66 | Upper Midwest |
| 1988 | January 4–8 | 21.93 | South |
| 1991 | October 30 – November 3 | 20.99 | Upper Midwest |
| 1993 | March 11–14 | 24.67 | Ohio Valley |
| 1993 | November 20–28 | 19.26 | Rocky Mountains and Plains |
| 1996 | January 5–8 | 20.99 | Southeast |
| 2009 | December 21–28 | 18.67 | Rocky Mountains and Plains |
| 2011 | January 31–February 2 | 19.81 | Ohio Valley |
| 2016 | January 22–24 | 20.14 | Northeast[4] |
See also
References
- ^ a b "Regional Snowfall Index (RSI)". NOAA: National Centers for Environmental Information. Retrieved 16 February 2016.
- ^ "Regional Snowfall Index and Societal Impacts". Retrieved 2014-11-18.
{{cite web}}: Cite has empty unknown parameter:|1=(help) - ^ "NOAA Product Highlight: Regional Snowfall Index". Archived from the original on 2014-11-29. Retrieved 2014-11-18.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ "Putting the January 22–24 Snowstorm in Historical Context". National Oceanic and Atmospheric Administration. February 18, 2016. Retrieved February 21, 2016.