Heavy rain will be possible Wednesday across the Southern Plains in association with the remnants of Tropical Storm Bill. Isolated severe thunderstorms are possible during the afternoon over the Northern High Plains. Strong to severe thunderstorms are possible for the Ohio Valley.

Eastern Texas, Eastern Oklahoma, and Western Arkansas: Moisture associated with the diminished Tropical Storm Bill will interact with a trailing cold front across the region. This will result in widespread heavy rainfall across the area with total accumulation forecast between two and six inches. Locally higher amounts in excess of ten inches will be possible in a few location. Primary impacts associated with this heavy rainfall will be flash flooding, especially in flood-prone areas due to the abundant rainfall received over the last several weeks across the area.

Northern High Plains: Isolated strong to severe thunderstorm are forecast to develop in the afternoon hours across the northern High Plains on Wednesday. While ridging aloft is anticipated across the region, hindering storm development, favorable wind shear and instability from daytime heating is anticipated to allow for isolated thunderstorms to develop. Primary hazards include damaging winds and large hail along with frequent lighting and heavy rain within any developing storm.

Ohio Valley: Ahead of a warm front lifting to the northeast across the Ohio Valley, shower and thunderstorm development is likely. Stronger clusters of storms in the afternoon, supported by the upper-level environment, have the potential to become severe embedded within the cluster of thunderstorms. Primary hazards associated with strong development will include damaging winds, hail, frequent lighting, and heavy rainfall.