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Extreme weather- Blizzards

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Kristen Lewis

on 22 October 2012

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Transcript of Extreme weather- Blizzards

A blizzard is a sever thunderstorm with high winds and low visibility. Febuary second 2012 http://www.britannica.com/EBchecked/topic/69478/blizzard Blizzards by: Kristen Lewis Blizzards in Canada Worst blizzards of all time What is a blizzard? Sources How is a blizzard formed? Snow storms can be caused by a warm front coliding with a cold front. This creates a low pressure zone. When clouds in the low pressure zone are filled with ice crystals, there are chances for a major blizzard. -Bonavista area -100 km winds -15 cm snowfall Newfoundland Glaze Storm April 13 1984 Residents of the Avalon Peninsula (200 000) were without electricity for days when cylinders of ice as large as 15 cm in diameter formed on overhead wires. The severe, two-day ice and snow storm covered all of southeastern Newfoundland with 25 mm of glaze. Ice Storm of the Century - January 4-9, 1998 One of the most destructive and disruptive storms in Canadian history hit Eastern Canada causing hardship for 4 million people and costing $3 billion. Losses included millions of trees, 130 transmission towers and 120,000 km of power and telephone lines. Power outages lasted from several hours to four weeks. Toronto's Snowstorm of the Century - January 2-15, 1999 A series of storms stalked the city, dumping nearly a year's amount of snow in less than two weeks. In all, the city recorded the greatest January snowfall total ever with 118.4 cm and the greatest snow on the ground at any one time with 65 cm. The storms cost the city nearly twice the annual budget in snow removal. Greatest Single-Day Snowfall Record - February 11, 1999 Tahtsa Lake, BC, received 145 cm of snow, a new Canadian single-day snowfall record, but well below the world's record of 192 cm at Silver Lake, Colorado on April 15, 1921 Blizzard Maroons PEI - February 22-26, 1982 A huge snowstorm with up to 60 cm of snow, 100 km/h winds, zero visibility and wind chills of -35°C paralyzed the Island for a week. The storm buried vehicles, snowplows and trains in 5- to 7-metre drifts and cut off all ties with the mainland. What's the difference between a blizzard and a snowstorm? The difference between a blizzard and a 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 56 km/h (35 mph) 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. Snowfall amounts do not have to be significant. A severe blizzard has winds over 72 km/h (45 mph), near zero visibility, and temperatures of −12 °C (10 °F) or lower. A ground blizzard has snowdrifts and blowing snow near the ground, but no falling snow. 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. http://w1.weather.gov/glossary/index.php?letter=b
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