Excessive rainfall is possible over parts of central and southeast Illinois, and Eastern Indiana, through tonight. This will lead to a risk of flash flooding.
Areas affected: Locations along and south of Interstate 72, from Springfield to Danville southward. This also includes the following towns: Taylorville, Shelbyville, Tuscola, Charleston/Mattoon, Paris, Effingham, Newton, Flora, Olney, and Lawrenceville, IL, and the Wabash Valley.
Periods of showers and thunderstorms will affect the area through early Tuesday, as waves of low pressure ride along a stalled frontal boundary over southern Illinois. Storms will likely be slow moving, increasing heavy rainfall rates. Additional rainfall totals of 1 to 2.55 inches are likely through Tuesday morning.
The threat of river flooding will increase as the first half of the week progresses. Flood-prone roads and low spots will likely have standing water on them at times. This threat will be enhanced in areas that already have had heavy rain the last couple days. Some storms may produce extremely heavy rain, causing difficult travel due to poor visibility.