Rating Hurricanes: The Saffir-Simpson Scale

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Hurricane Irma will be a formidable hurricane for days to come in the Atlantic Basin, but its future impact in the U.S. remains unknown.

(MORE: Comprehensive Hurricane Irma Coverage)

This is a developing weather story. For the latest on Irma's potential impact on the mainland U.S., check out our latest forecast here.

For tips on how to prepare for a hurricane, the Federal Alliance for Safe Homes has an excellent site to help.