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Új oldal, tartalma: „ ----- A blizzard is a severe weather condition characterized by high winds and reduced visibilities due to falling or blowing snow. The U.S. National Weather Service s…” |
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enwiki:
A '''blizzard''' is a severe [[snowstorm]] characterized by strong winds and low temperatures. The difference between a blizzard and a [[Snow-storm|snowstorm]] is the strength of the wind. To be a blizzard, a snow storm must have sustained winds or frequent gusts that are greater than or equal to {{convert|56|km/h|abbr=on}} with blowing or drifting snow which reduces [[visibility]] to 400 meters or a quarter mile or less and must last for a prolonged period of time — typically three hours or more.<ref>{{cite web|url=http://www.weather.gov/glossary/index.php?letter=b |title=Blizzard at the US National Weather Service glossary |publisher=Weather.gov |date=2009-06-25 |accessdate=2012-08-18}}</ref> Snowfall amounts do not have to be significant. In Australia the definition requires that at least some snow has been raised from the ground.<ref>{{cite web|url=http://www.bom.gov.au/info/wwords/ |title=Blizzard definition, Weather Words, Australian Government Bureau of Meteorology |publisher=Bom.gov.au |date= |accessdate=2012-08-18}}</ref>
A severe blizzard has winds over {{convert|72|km/h|abbr=on}}, near zero visibility, and temperatures of −12 °C (10 °F) or lower. A ground blizzard has [[snowdrift]]s and blowing snow near the ground, but no falling snow.<ref>[http://www.britannica.com/EBchecked/topic/69478/blizzard "Blizzard"] ''Encyclopædia Britannica Online'' retrieved 17 March 2012</ref>
Blizzards can bring near-whiteout conditions, and can paralyze regions for days at a time, particularly where snowfall is unusual or rare. The [[1972 Iran blizzard]], which caused approximately 4,000 deaths, was the deadliest in recorded history.
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