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The 2013 Atlantic hurricane season runs from June 1st to November 30th.
The National Weather Service defines a hurricane as "an intense tropical weather system with well-defined circulation and sustained winds of 74 mph (64 knots) or higher."
Hurricanes are rated according to intensity on the Saffir-Simpson Hurricane Scale.
The 1-5 scale estimates potential property damage.
A Category 3 or higher is considered a major hurricane.
The National Hurricane Center advises Preparedness:
A hurricane watch indicates the possibility that a region could experience hurricane conditions within 48 hours.
A hurricane warning indicates that tropical-storm-force winds of at least 74 mph are expected within 36 hours.
To find out more information and Cited from:
http://www.cnn.com/2013/05/21/us/2013-atlantic-hurricane-season-fast-facts/index.html?hpt=us_bn1