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Home GPM saw Harvey’s rainfall pattern was highly asymmetric with the bulk of the rain located north and east of the center on Aug. 27. A broad area of moderate rain (green areas) can be seen stretching from near Galveston Bay to north of Houston and back well to the west. Within this are embedded areas of heavy rain (red areas); the peak estimated rain rate from GPM at the time of this overpass was 96 mm/hour (~3.77 inches per hour). (NASA/JAXA, Hal Pierce) GPM saw Harvey's rainfall pattern was highly asymmetric with the bulk of the rain located north and east of the center on Aug. 27. A broad area of moderate rain (green areas) can be seen stretching from near Galveston Bay to north of Houston and back well to the west. Within this are embedded areas of heavy rain (red areas); the peak estimated rain rate from GPM at the time of this overpass was 96 mm/hour (~3.77 inches per hour). (NASA/JAXA, Hal Pierce)

GPM saw Harvey’s rainfall pattern was highly asymmetric with the bulk of the rain located north and east of the center on Aug. 27. A broad area of moderate rain (green areas) can be seen stretching from near Galveston Bay to north of Houston and back well to the west. Within this are embedded areas of heavy rain (red areas); the peak estimated rain rate from GPM at the time of this overpass was 96 mm/hour (~3.77 inches per hour). (NASA/JAXA, Hal Pierce)

GPM saw Harvey's rainfall pattern was highly asymmetric with the bulk of the rain located north and east of the center on Aug. 27. A broad area of moderate rain (green areas) can be seen stretching from near Galveston Bay to north of Houston and back well to the west. Within this are embedded areas of heavy rain (red areas); the peak estimated rain rate from GPM at the time of this overpass was 96 mm/hour (~3.77 inches per hour). (NASA/JAXA, Hal Pierce)

GPM saw Harvey’s rainfall pattern was highly asymmetric with the bulk of the rain located north and east of the center on Aug. 27. A broad area of moderate rain (green areas) can be seen stretching from near Galveston Bay to north of Houston and back well to the west. Within this are embedded areas of heavy rain (red areas); the peak estimated rain rate from GPM at the time of this overpass was 96 mm/hour (~3.77 inches per hour). (NASA/JAXA, Hal Pierce)

NASA’s IMERG rainfall analysis for Tropical Storm Harvey covers the period from Aug. 21 through Aug. 28, 2017. IMERG shows rainfall totals to 20 inches (purple shading) from the coast near Galveston Bay to in and around the Houston area. At least 10 inches (red shading) are shown to have fallen from western Louisiana all the way to near Corpus Christi on the coast. (NASA/JAXA, Hal Pierce)