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List of Regional Snowfall Index Category 5 winter storms : ウィキペディア英語版 | List of Regional Snowfall Index Category 5 winter storms 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. 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 sixteen 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 Groundhog Day blizzard of 2011. The following list orders the storms chronologically.〔(【引用サイトリンク】publisher=National Oceanic and Atmospheric Administration )〕〔(【引用サイトリンク】 )〕〔(【引用サイトリンク】title=NOAA Product Highlight: Regional Snowfall Index )〕 ==See also==
*List of NESIS storms
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