English subtitles for clip: File:NASA Captures Hurricane Harvey's Rainfall.webm

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Favorable environmental conditions and warm waters in the Gulf allowed tropical storm Harvey to restructure and strengthen over several days.

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On August 25, Harvey became a category 4 hurricane.

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The Global Precipitation Measurement (GPM) Core Observatory saw several passes.

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GPM captured the hurricane continuously over land and ocean, observing the storm beyond the reach of land-based radars.

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As Harvey slowly moved southeast, GPM showed an asymmetric rainfall pattern

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with a massive swath of rain reaching north and east of the hurricane’s center.

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NASA's Integrated Multi-satellite Retrievals for GPM estimated over 30 inches of rain from August 21 to 29.

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The rainfall has lead to catastrophic flooding and difficult relief efforts.