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The Global Precipitation Measurement (GPM) mission provided an analysis of the storms that

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led to widespread flooding in Louisiana in August 2016.

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The storm might have turned into a tropical cyclone, except that it formed over land,

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which limited its moisture supply.

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The GPM satellite looked beneath the clouds to detect curved rain bands near the storm's center.

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Over water, this structure would form an eyewall.

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Trapped under upper level high pressure, the storm

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slowed, causing recording flooding for Louisiana. 

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Data from GPM and other satellites provided estimates of more than 20 inches of rain

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across Louisiana from August 8-15.

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These events challenge numerical

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weather models when the rain occurs with large amounts of moist, rising air and no

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definitive steering winds. Combining rainfall estimates with hydrological

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models can improve estimates of when and where major floods occur.

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