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NASA Report: Hurricane Harvey Heat Engine Analysis Confirmed by WWLLN
Under the central ring of clouds that circles the eye, water that had evaporated from the ocean surface condenses, releases heat, and powers the circling winds of the hurricane. The radar on the GPM satellite is able to estimate how much water is falling as precipitation inside of the hurricane, which serves as a guide to how much energy is being released inside the hurricane's central "heat engine." Confirming this radar analysis are lightning flashes observed by the World Wide Lightning Location Network (WWLLN).
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