National Weather Service United States Department of Commerce

Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Overview

A very unstable airmass was in place ahead of a weak mid-level disturbance that moved into the area. Temperatures surged into the upper 80s to lower 90s within a very moist airmass characterized by tropical-like dewpoints in the mid to upper 70s. Scattered thunderstorms rapidly developed around 11am near a remnant outflow boundary from earlier convection. The storms formed into several clusters that moved southeast across portions of southeast IL, southwest IN, and much of western KY. The main threat was damaging winds, with a few scattered small hail reports as well.
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