INDIANAPOLIS, INDIANA — Heading into mid-August, another area of high pressure will set up in the Deep South, meaning more “ridge-runner” type storms, but this time the Ohio Valley and Lower Great Lakes will be at greatest risk for multiple rounds of storm clusters and heavy rain, according to a pattern update valid August 11 through 16, 2026. Indianapolis, Cincinnati and Pittsburgh all sit within the highlighted zone facing elevated storm and flooding risks.
Storm Clusters and Flash Flooding Zone Stretches From Minnesota to the East Coast
The highlighted “Storm Clusters & Flash Flooding” zone, shown in green, forms a broad corridor stretching from near Sioux Falls and Minneapolis southeast through Chicago, Indianapolis, Cincinnati, Pittsburgh and continuing toward Washington, D.C. and Richmond, Virginia. This corridor sits along the northern periphery of the building high pressure system, positioned to receive repeated rounds of storm activity as systems ride along the boundary…