Northeast Snowfall Impact Scale
Encyclopedia
The Northeast Snowfall Impact Scale was created to measure snowstorms in the U.S. Northeast in much the same way the Saffir-Simpson Hurricane Scale
records hurricane intensity and the Enhanced Fujita Scale
with tornadoes
.
of The Weather Channel and Louis Uccellini of the National Weather Service
, classifies storms in one of five ways that range from Notable (the weakest designation) to Significant, Major, Crippling, and Extreme. They created this measuring system due to the effects these storms have on the economy and transportation throughout the major cities in the Northeastern United States as well as the country as a whole.
The variables measured on the scale include area, amount of snow
fall, and the number of people
living in the path of the storm. These numbers are calculated into a raw data number ranging from "1" for an insignificant fall to over "10" for a massive snowstorm. Based on these raw numbers, the storm is placed into one of the five categories. The largest NESIS values result from storms producing heavy snowfall over large areas that include major metropolitan areas. Only two historical storms—the 1993 Storm of the Century and the North American blizzard of 1996
—are in the Category 5, with a NESIS value higher than 10.
The northeast is the first region in the U.S. to use a system that measures the impact of snowfall because it is so densely populated. The scale also allows for meteorologists to predict how long airport delays caused snowstorms will last and when things will become normal afterward. According to Uccellini, NESIS will be used to reevaluate recent snowstorms and measure their impact and not as forecasts such as the ones that are created for hurricanes.
Saffir-Simpson Hurricane Scale
The Saffir–Simpson Hurricane Scale , or the Saffir–Simpson Hurricane Wind Scale , classifies hurricanes — Western Hemisphere tropical cyclones that exceed the intensities of tropical depressions and tropical storms — into five categories distinguished by the intensities of their sustained winds...
records hurricane intensity and the Enhanced Fujita Scale
Enhanced Fujita Scale
The Enhanced Fujita Scale rates the strength of tornadoes in the United States based on the damage they cause.Implemented in place of the Fujita scale introduced in 1971 by Ted Fujita, it began operational use on February 1, 2007. The scale has the same basic design as the original Fujita scale:...
with tornadoes
Tornado
A tornado is a violent, dangerous, rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. They are often referred to as a twister or a cyclone, although the word cyclone is used in meteorology in a wider...
.
The Scale
NESIS, as it has been dubbed by creators Paul KocinPaul Kocin
Paul Kocin is a meteorologist and winter weather expert. He grew up on Long Island, New York and received his B.S. from Cornell University, followed by his M.Sc. from Pennsylvania State University. After graduation, he briefly worked for NASA as a contractor then was hired by the US National...
of The Weather Channel and Louis Uccellini of the National Weather Service
National Weather Service
The National Weather Service , once known as the Weather Bureau, is one of the six scientific agencies that make up the National Oceanic and Atmospheric Administration of the United States government...
, classifies storms in one of five ways that range from Notable (the weakest designation) to Significant, Major, Crippling, and Extreme. They created this measuring system due to the effects these storms have on the economy and transportation throughout the major cities in the Northeastern United States as well as the country as a whole.
| Category | NESIS Value | Description |
|---|---|---|
| 1 | 1 — 2.499 | Notable |
| 2 | 2.5 — 3.99 | Significant |
| 3 | 4 — 5.99 | Major |
| 4 | 6 — 9.99 | Crippling |
| 5 | 10.0+ | Extreme |
The variables measured on the scale include area, amount of snow
Snow
Snow is a form of precipitation within the Earth's atmosphere in the form of crystalline water ice, consisting of a multitude of snowflakes that fall from clouds. Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft structure, unless packed by...
fall, and the number of people
Census
A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population. The term is used mostly in connection with national population and housing censuses; other common...
living in the path of the storm. These numbers are calculated into a raw data number ranging from "1" for an insignificant fall to over "10" for a massive snowstorm. Based on these raw numbers, the storm is placed into one of the five categories. The largest NESIS values result from storms producing heavy snowfall over large areas that include major metropolitan areas. Only two historical storms—the 1993 Storm of the Century and the North American blizzard of 1996
North American blizzard of 1996
The Blizzard of 1996 was a severe nor'easter that paralyzed the U.S. East Coast with up to of wind-driven snow from January 6 to January 8, 1996. It was followed by another storm on January 12th, then unusually warm weather and torrential rain which caused rapid melting and river...
—are in the Category 5, with a NESIS value higher than 10.
The northeast is the first region in the U.S. to use a system that measures the impact of snowfall because it is so densely populated. The scale also allows for meteorologists to predict how long airport delays caused snowstorms will last and when things will become normal afterward. According to Uccellini, NESIS will be used to reevaluate recent snowstorms and measure their impact and not as forecasts such as the ones that are created for hurricanes.
Example
By using an example of the area from Washington D.C. to Boston, a Notable Category 1 snowfall would have to drop anywhere from 4 to 10 inches of snow to fall in the category. A Category 2 would affect same area but more people with more than 10 inches of snow on Mid Atlantic Seaboard. A Category 3 would bring about 10-20 inches of snow and affect millions of people in the process.External links
- Overview
- Northeast Snowfall Impact Scale
- ScienceDaily Ranking Winter Storms: Meteorologists' New Scale Will Help in Emergency Planning January 1, 2007 (accessed 11 Nov 2007)