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The accumulated winter season severity index or AWSSI provides a scientific way to compare the severity of a winter relative to its weather history. Points are assigned daily based on the maximum and minimum temperature, snowfall and snow depth for a specific site and accumulated through the winter. [1]
The regional snowfall index (RSI) is a scale used by NOAA to assess the societal impact of winter storms in the eastern two-thirds of the United States and classify them into one of six categories. The system was first implemented in 2014, and is a replacement for the Northeast Snowfall Impact Scale (NESIS) system which the National Climatic ...
Snowfall map of the Great Blizzard of 1978, the highest-ranking storm on the regional snowfall index, outlining the six regions assessed with the scale. The regional snowfall index (RSI) is a system used by NOAA to assess the societal impact of winter storms in the United States.
The DNR's annual winter severity index found all 72 Wisconsin counties had mild winters in 2023-24, ... At the end of the season, if the points total less than 50, it's considered a mild winter ...
Accumulated winter season severity index; Aviation Weather Center; C. Climate Prediction Center; E. Environmental Modeling Center; H. History of Atlantic hurricane ...
The 2020–21 North American winter was the most significant winter season to affect North America in several years, and the costliest on record, with a damage total of at least $33.35 billion (2021 USD). The season featured six storms ranking on the Regional Snowfall Index scale (RSI), with four
The list of snowiest places in the United States by state shows average annual snowfall totals for the period from mid-1985 to mid-2015. Only places in the official climate database of the National Weather Service, a service of NOAA, are included in this list.
Out of the nearly 600 historical winter storms assessed since 1900, only 74 storms have been given a category 4 or above ranking, 48 of which were category 4 storms. The highest ranking category 4 winter storm is the March 2–8, 1915 United States blizzard, which had an RSI of 17.67.