See map of storm's forecasted path
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Hurricane Erin catapulted in strength overnight from a low-end Category 1 to a monstrous Category 4. The powerhouse storm, which was located several hundred miles east-northeast of Puerto Rico on Saturday morning,
Even when they don't brush the coast or make landfall, such storms can be deadly and cause millions of dollars of damage. Erin is expected to remain hundreds of miles offshore, according to the National Hurricane Center,
The longstanding hurricane rating system, the Saffir-Simpson Scale, only takes into account sustained wind speeds and not the full devastating impact of a hurricane.