Ground blizzard refers to a
weathercondition where loose snow or ice on the ground is lifted and blown by strong winds. The primary difference between a ground blizzard as opposed to a regular blizzardis that in a ground blizzard no precipitation is produced at the time, but rather all the precipitation is already present in the form of snow or ice at the surface.
While the term "ground BLIZZARD" is often associated with intense blowing and drifting snow conditions, there are specific criteria which must be met. Often such criteria will be determined by a country's governing weather agency or other similar body. In the U.S, according to the National Weather Service a blizzard is defined as having sustained winds or frequent gusts of 35 mph or more, visibility frequently below 1/4 mile in considerable snow and/or blowing snow, and the above conditions are expected to prevail for 3 hours or longer. Environment Canada similarly maintains that the temperature must be colder than 0°C, widespread reduction of visibility to less than 1 kilometer due to snow and/or blowing snow and sustained wind speeds or gusts of 40 km/h or more, with all these conditions persisting for at least 4 hours (6 hours for the Northwest Territories and Nunavut):}
There are 3 different forms of ground blizzards:
horizontal advectionconditions, the winds blow across the surface of the earth with very little if any large-scale upward motion.
vertical advectionconditions, the winds exhibit large-scale upward motion lifting the snow into the atmosphere creating drifting waves of snow up to 500 meters in height.
thermal-mechanicalmixing conditions, massive convective rolls form in the atmosphere and the blizzard may be observed from space with the blizzards convective rolls creating waves of snow (also known as [http://cimss.ssec.wisc.edu/goes/misc/blsn_nd.html snow billows] ) resembling lake or ocean effect snow bands. The extreme conditions can quickly bury a two story home and make breathing very difficult if not impossible if caught outdoors.
Ground blizzards occur throughout the world, however unlike other winter storms, topography either aids in their formation or prevention. The most important topographic element in a blizzard is the requirement for a vast amount of large open and relatively flat land. Any type of flora, especially coniferous forms, will catch any drifting snow significantly reducing the blizzards effects. The environment must also support temperatures cold enough to prevent any snow on the ground from melting and bonding the ice crystals together.
Ground blizzards are most common in the Arctic and Antarctic during seasonal transition periods, such as the spring and fall. Ground blizzards are also common in the Canadian Prairies and U.S Midwest as well as Siberia and Northern China.
Famous ground blizzards
Great Lakes Blizzard of 1977
* [http://severewx.atmos.uiuc.edu/14/online.14.1.html Animation of an extreme ground blizzard as seen from space]
* [http://www.crh.noaa.gov/arx/seaterm.php Definition of various weather terms including a ground blizzard]
* [http://cimss.ssec.wisc.edu/goes/misc/blsn_nd.html CMISS Article dealing with the North Dakota ground blizzard satellite imagery]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Blizzard (Météorologie) — Pour les articles homonymes, voir Blizzard. Le blizzard est caractérisé par des vents violents et une faible visibilité Le blizzard désigne … Wikipédia en Français
Blizzard of 1977 — Snow drifts made travel difficult in parts of New York (February 7, 1977), shown is the city of Buffalo … Wikipedia
Blizzard — A blizzard is a severe winter storm condition characterized by low temperatures, strong winds, and heavy blowing snow Blizzards are formed when a high pressure system, also known as a ridge, interacts with a low pressure system; this results in… … Wikipedia
Blizzard (météorologie) — Pour les articles homonymes, voir Blizzard. Le blizzard est caractérisé par des vents violents et une faible visibilité Le blizzard désigne deux phénomènes météorologiques neigeux différen … Wikipédia en Français
blizzard — blizzardy, blizzardly, adj. /bliz euhrd/, n. 1. Meteorol. a. a storm with dry, driving snow, strong winds, and intense cold. b. a heavy and prolonged snowstorm covering a wide area. 2. an inordinately large amount all at one time; avalanche: a… … Universalium
Ground Control — Entwickler Massive Entertainment Publisher … Deutsch Wikipedia
Blizzard (Donnie Gill) — Superherobox| caption=Blizzard, art by Rick Leonardi. comic color=background:#ff8080 character name=Blizzard real name=Donald Donnie Gill publisher=Marvel Comics debut= Iron Man #223 (October 1987) creators=David Michelinie Bob Layton… … Wikipedia
Blizzard watch — A Blizzard Watch is an advisory issued by the National Weather Service of the United States which means winds greater than convert|35|mph|kn km/h|0, mixed with falling or blowing snow, and visibilities of convert|1/4|mi|km|1 or less is forecast… … Wikipedia
Lake effect blizzard — is an unofficial term used to describe blizzard like conditions resulting from lake effect snow. Formation and usage Under certain conditions strong winds can accompany lake effect snows creating blizzard like conditions. Lake effect snow squalls … Wikipedia
Great Lakes Blizzard of 1977 — The Blizzard of ‘77 was a deadly blizzard that hit Buffalo, New York and the area around it in New York and Ontario (and to a lesser extent, surrounding regions) from January 28 to February 1, 1977. Daily peak gusts of 69, 51, 52, 58 and 46 miles … Wikipedia