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NASA's Integrate Multi-satellitE Retrievals for GPM (IMERG) product followed the path of Hurricane Isaias as it coursed through the Caribbean.

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On August 2, 2020, the NASA/JAXA Global Precipitation Measurement (GPM) satellite passed over Isaias as it crossed into the central Bahamas, revealing deep hot towers.

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At this point, southwesterly wind shear and the interaction with the land caused Isaias to weaken from a Category 1 hurricane down to a tropical storm.

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GPM shows that the rain was almost entirely northeast of Isaias' center with very little rain on the western side of the storm.

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This highly asymmetric structure reflects both the effects of wind shear and Isaias' lack of intensity.

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After regaining hurricane intensity over the Gulf Stream, Hurricane Isaias made landfall on the south coast of North Carolina on August 3 at 11:10 pm EDT near Ocean Isle Beach.

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On August 4, GPM caught Tropical Storm Isaias about 5 hours after landfall, with the center of circulation over northeastern North Carolina.


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GPM observed a large rain shield extending to New England and the Canadian border along a coastal front.

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Parts of the Bahamas received over 30 centimeters (~1 foot) of rainfall during Isaias' passage, while some areas in the U.S. East Coast received over 7.5 centimeters (~3 inches) by dawn of August 4, on the way to 8 inches or more.