Winter storm


Winter storm

A winter storm is an event in which the dominant varieties of precipitation are forms that only occur at cold temperatures, such as snow or sleet, or a rainstorm where ground temperatures are cold enough to allow ice to form (i.e. freezing rain). In temperate continental climates, these storms are not necessarily restricted to the winter season, but may occur in the late autumn and early spring as well. Very rarely, they may form in summer, though it would have to be an abnormally cold summer, such as the summer of 1816 in the Northeast United States of America. In many locations in the Northern Hemisphere, the most powerful winter storms usually occur in March and, in regions where temperatures are cold enough, April.

Snow

Snowstorms are storms where large amounts of snow fall. Snow is less dense than liquid water, by a factor of approximately 10 at temperatures slightly below freezing, and even more at much colder temperatures. Therefore, an amount of water that would produce 2 cm (0.8 in.) of rain could produce as much as 20 cm (8 in.) of snow. Five centimeters of snow (2 in.) is enough to create serious disruptions to traffic and school transport (because of the difficulty to drive and maneuver the school buses on slick roads). This is particularly true in places where snowfall is uncommon but heavy accumulating snowfalls can happen (e.g., Atlanta, Seattle, London, Canberra, Vancouver). In places where snowfall is common, such as Utica, Detroit, Montreal, Quebec City, Toronto and Minneapolis, such small snowfalls are rarely disruptive, though snowfalls in excess of 15 cm (6 in.) usually are.

A massive snowstorm with strong winds and other conditions meeting certain criteria is known as a blizzard. A large number of heavy snowstorms, some of which were blizzards, occurred in the United States during the early and mid-1990s, and the 1993 "Superstorm" was manifest as a blizzard in most of the affected area.

Large snowstorms could be quite dangerous: a 15 cm (6 in.) snowstorm will make some unplowed roads impassible, and it is possible for automobiles to get stuck in the snow. Snowstorms exceeding 30 cm (12 in.) especially in southern or generally warm climates will cave the roofs of some homes and cause the loss of power. Standing dead trees can also be brought down by the weight of the snow, especially if it is wet or very dense. Even a few inches of dry snow can form drifts many feet high under windy conditions.

Snowstorms are usually considered less dangerous than ice storms. However, the snow brings secondary dangers. Mountain snowstorms can produce cornices and avalanches. An additional danger, following a snowy winter, is spring flooding if the snow melts suddenly due to a dramatic rise in air temperature. Deaths can occur from hypothermia, infections brought on by frostbite, car accidents due to slippery roads, fires or carbon monoxide poisoning due to alternative heating methods after a storm causes a power outage, or heart attacks caused by overexertion while shoveling heavy wet snow.

Wintry showers or wintry mixes

Many factors influence the form precipitation will take, and atmospheric temperatures are influential as well as ground conditions. Sometimes, near the rain/snow interface a region of sleet or freezing rain will occur. It is difficult to predict what form this precipitation will take, and it may alternate between rain and snow. Therefore, weather forecasters just predict a "wintry mix". Usually, this type of precipitation occurs at temperatures between -2 °C and 2° C (28°F and 36°F). For example, in 2008, a small snowstorm hit the major Australian city of Sydney. Although the city itself did not receive the wintry mix, surrounding suburbs above 200 m received graupel (a form of snow/ice pellet-type precipitation). This was the first recorded snowfall in the city limits in the 21st century. "(See 2008 Sydney Snowfall.)"

Freezing rain storms and ice storms

Heavy showers of freezing rain are one of the most dangerous types of winter storm. They typically occur when a layer of warm air hovers over a region, but the ambient temperature is near 0 °C (32 °F), and the ground temperature is sub-freezing. A storm in which only roads freeze is called a freezing rain storm; one resulting in widespread icing of plants and infrastructure is called ice storm.

While a 10 cm (4 in.) snowstorm is somewhat manageable by the standards of the northern United States and Canada, a comparable 1 cm (0.4 in.) ice storm will paralyze a region: driving becomes extremely hazardous, telephone and power lines are damaged, and crops may be ruined. Because they do not require extreme cold, ice storms often occur in warm temperature climates (such as the southern United States) and cooler ones. Ice storms in Florida will often destroy entire orange crops.

Notable ice storms include an El Niño-related North American ice storm of 1998 that affected much of eastern Canada, including Montreal and Ottawa, as well as upstate New York and part of New England. Three million people lost power, some for as long as six weeks. One-third of the trees in Montreal's Mount Royal park were damaged, as well as a large proportion of the sugar-producing maple trees. The amount of economic damage caused by the storm has been estimated at $3 billion Canadian.

The Ice Storm of December 2002 in North Carolina resulted in massive power loss throughout much of the state, and property damage due to falling trees. Except in the mountainous western part of the state, heavy snow and icy conditions are rare in North Carolina.

The Ice Storm of December 2005 was another severe winter storm producing extensive ice damage across a large portion of the Southern United States on December 14 to 16. It led to widespread power outages and at least 7 deaths.

In January 2005 Kansas had been declared a major disaster zone by President George W. Bush after an ice storm caused nearly $39 million in damages to 32 counties. Federal funds were provided to the counties during January 4-6, 2005 to aid the recovery process. [ [http://www.accesskansas.org/ksadjutantgeneral/News%20Releases/2005/Gov%2002-09-05.htm Presidential Disaster Declaration authorized for Kansas counties hit by January ice storm ] ]

See also

*Comprehensive discussion of weather related terms, such as "Winter Storm Warning" :
** Severe weather terminology (United States)
** Severe weather terminology (Canada)
* Winter storms of 2006-07
* Winter storms of 2007-08
* Winter Storm Warning
* Winter Storm Watch
* Winter Weather Advisory
* Heavy snow warning
* Ice Storm Warning
* Snow Advisory
* Cold wave
* Siberian Express

References

* [http://www.ncdc.noaa.gov/oa/esb/?goal=weather&file=events/snow/ Social & Economic Costs of Snow & Ice Storms] from "NOAA Socioeconomics" website initiative


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • winter storm — noun A meteorological event in which the dominant varieties of precipitation are forms that only occur at cold temperatures, such as snow or sleet, or a rainstorm in which ground temperatures are cold enough to allow ice to form …   Wiktionary

  • Winter storm warning — A Winter Storm Warning is a statement made by the National Weather Service of the United States which means a winter storm is occurring or is about to occur in the area, usually within 24 hours. Generally, a Winter Storm Warning is issued if at… …   Wikipedia

  • Winter storm watch — A Winter Storm Watch is issued by the National Weather Service of the United States when there is a potential for heavy snow (6 or more inches) or significant ice accumulations. The watch is usually issued at least 24 to 36 hours before the storm …   Wikipedia

  • My Winter Storm — Studio album by Tarja Released 19 November 2007 …   Wikipedia

  • Early December 2007 North American winter storm — Infobox winter storm|name=Early December 2007 North American winter storm image location= stormtype=Colorado Low date formed=November 30, 2007 date dissipated= December 5, 2007 maximum amount= 44 inches at Wolf Creek Pass, Colorado pressure=976… …   Wikipedia

  • February 2007 North America Winter Storm — infobox winter storm name=Valentine s Day Storm of 2007 image location=21407blizzard lg.jpg| Monkton, Vermont stormtype=Winter storm date formed=February 12, 2007 date dissipated=February 20, 2007 maximum amount=convert|48|in|abbr=on Stowe,… …   Wikipedia

  • My Winter Storm — Studioalbum von Tarja Turunen Veröffentlichung 2007 Label Vertigo Records / Universal Records …   Deutsch Wikipedia

  • My Winter Storm — Студийный альбом Тарьи Турунен …   Википедия

  • March 2010 North American winter storm — Storm type: Nor easter Formed: March 12, 2010 Dissipated: March 16, 2010(moved out to sea) Lowest pressure: 993 millibars (29.3 inHg) as of 10:00 PM EST, March 13, 2010 Fatalities: 9 …   Wikipedia

  • Operation Winter Storm — Part of Eastern Front (World War II) …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.