Tuesday, December 14, 2010
The Top Ten Most Extreme Weather Conditions
From April 3 to April 4, 1974, in a period of 18 hours, 148 tornadoes occurred across the 13 central US states and Ontario, Canada. The event came to be known as the “Super Outbreak” and it had devastating effects. 24 of the tornadoes were classified on the Fujita Scale as F4’s, and six were F5’s, more F5’s than have been reported in any other year. There were also more significant tornadoes during that 24 hours than any other entire week on record. It extensively damaged approximately 900 square miles (1,440 square kilometers) along a total combined path length of 2,600 miles (4,160 km). The outbreak of tornadoes was caused by an extreme low-pressure system that moved across the US, and it created $3.5 billion in damages. More than three hundred people were killed during the 18 hours, and 5,484 people were injured.