The Northeast Snowfall Impact Scale (NESIS) and Regional Snowfall Index (RSI) describe the impact of snowfall in a region of the United States.
Parameters:
(1) depth of snowfall vs historical records of snowfall
(2) area affected vs total area of region (how widespread)
(3) population affected vs total census population
NESIS Value
RSI Value
Category
< 2.5
< 3.00
1
2.5 to 3.99
3 to 5.99
2
4.0 to 5.99
6 to 9.99
3
6.00 to 9.99
10 to 17.99
4
>= 10.00
>= 18.00
5
The impact of a given amount of snow differs by region. A region with little snowfall may be impacted much more than a region with frequent snowfall.
Description
notable
significant
major
crippling
extreme
These measures do not include other factors such as wind speed, utility outage, etc.
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Specialty: Emergency Medicine
