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 category 5 ("extreme"). Only two historical blizzards, the 1993 Storm of the Century and the North American blizzard of 1996 are rated in the 5 "extreme" category. The scale differs from the Saffir–Simpson hurricane scale and Fujita scale, which are used to classify tropical cyclones and tornadoes, respectively, in that it takes into account the number of people affected by the storm. The scale, as devised, is intended chiefly to assess past storms rather than assist in forecasts. This scale takes into account population size of the Northeast, and thus snowfall amounts are often not that high. Kocin and Uccellini, pp. 269–270

List

There are two available values for NESIS. The original values that Paul Kocin and Louis Uccellini computed for storms in their original 2004 work "A Snowfall Impact Scale Derived From Northeast Storm Snowfall Distributions" and the NESIS storm values recomputed using some different data and differing methods by the National Climatic Data Center (NCDC) in 2005 to productionize their work for assigning values to future storm storms beyond Kocin/Uccellini work. Kocin/Uccellini originally computed NESIS values for 70 storms from 1888 to 2003. The NCDC recomputed NESIS values for 30 of the same storms and has since for newer storms beyond 2003.

Storms pre-2005 use the Kocin/Uccellini rating and description. Storms 2005 and onward use the NCDC rating and description. NOAA's National Centers for Environmental Information publishes a list of storms with ratings and other information, starting with the March 1956 storm.

Date Original NESIS NCDC NESIS Category Description 08.34 - 4 Crippling 08.11 - 4 Crippling 03.50 - 2 Significant 02.17 - 1 Notable 02.93 - 2 Significant 02.23 01.87 1 Notable 01.32 - 1 Notable 05.98 06.25 3 Major 03.92 03.51 2 Significant 03.64 - 2 Significant 04.17 - 3 Major 07.63 08.77 4 Crippling 04.47 04.53 3 Major 03.47 04.04 2 Significant 06.24 07.06 4 Crippling 01.37 - 1 Notable 01.59 - 1 Notable 02.76 - 4 Crippling 03.17 - 2 Significant 05.74 06.91 3 Major 02.39 - 1 Notable 01.95 - 1 Notable 04.45 - 3 Major 05.19 05.93 4 Crippling 03.79 03.81 2 Significant 03.82 03.50 2 Significant 01.20 - 2 Significant 03.34 03.51 2 Significant 04.01 04.29 3 Major 05.19 06.29 3 Major 02.10 - 1 Notable 03.73 - 2 Significant 02.33 - 1 Notable 04.19 04.77 3 Major 04.10 - 3 Major 05.90 06.53 4 Crippling 06.25 05.78 3 Major 04.42 04.77 3 Major 03.08 - 2 Significant 03.75 03.35 2 Significant 06.28 06.25 4 Crippling 01.29 - 1 Notable 01.86 - 1 Notable 02.26 - 1 Notable 04.93 05.40 3 Major 01.70 01.19 1 Notable 01.46 01.46 1 Notable 04.85 - 3 Major 01.56 - 1 Notable 03.10 - 2 Significant 12.52 13.20 5 Extreme 02.87 - 2 Significant 04.81 05.39 3 Major 03.46 - 2 Significant 03.51 01.43 2 Significant 03.32 - 2 Significant 11.54 11.78 5 Extreme 02.03 - 1 Notable 01.65 - 1 Notable 02.37 02.29 1 Notable 02.20 - 1 Notable 03.14 02.52 2 Significant 02.48 02.37 1 Notable 03.53 - 2 Significant 01.99 - 1 Notable 04.42 - 3 Major 02.65 - 2 Significant 01.18 - 1 Notable 08.91 07.50 4 Crippling - 06.80 4 Crippling - 04.10 3 Major - 05.63 3 Major - 02.54 2 Significant - 01.59 1 Notable - 03.99 2 Significant - 04.38 3 Major - 04.10 3 Major - 05.46 3 Major - 04.92 3 Major 05.31 3 Major - 02.17 1 Notable - 05.30 3 Major - 01.75 1 Notable - 04.35 3 Major - 03.05 2 Significant - 02.95 2 Significant - 03.31 2 Significant - 01.26 1 Notable - 04.08 3 Major - 05.28 4 Crippling - 01.56 1 Notable - 01.49 1 Notable - 02.62 3 Major - 05.42 3 Major - 01.32 1 Notable - 07.66 5 Extreme - 05.03 3 Major - 02.27 1 Notable - 01.65 1 Notable - 03.45 2 Significant - 03.16 2 Significant - 01.63 1 NotableDecember 14–18, 2020 -03.212SignificantJanuary 30–February 3, 2021 -04.933MajorJanuary 1-4, 2022 - 01.061Notable

List of Northeast snowfall impact scale winter storms

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