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Hurricane Harvey is whirling towards Texas with winds reaching 130 miles per hour — a Category 4 hurricane that was fueled by an unlucky pit stop over a deep patch of warm water in the Gulf of Mexico.

Warm water feeds hurricanes, which form when a weather disturbance, like a small storm, sucks the moist, warm air over the ocean’s surface into the lower atmosphere. When that moisture-laden air reaches cooler temperatures higher up in the atmosphere, the water condenses to form cloudswhich spin and grow, fueled by more warm ocean water as it evaporates.

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