Flash flooding is possible Sunday afternoon through Monday in La Salle and Livingston counties.
Steady rain will fall Sunday afternoon through Monday morning leading to ponding on roadways and in low-lying areas, according to the National Weather Service. A narrow zone of particularly heavy rain may lead to flooding of low-lying areas including farm fields, ditches and roadways. The greatest threat for such flooding appears to be across Livingston, Ford, Iroquois and Benton counties.
A flash flood watch means rapid-onset flooding is possible, but not yet certain, based upon the latest forecasts. Flash flooding can be dangerous. Residents with interests along area rivers, creeks, and other waterways should monitor the latest forecasts and be prepared to take action should flooding develop.
Additionally, a flood watch has been issued for the Illinois River from Heritage Harbor east of Ottawa downstream to Starved Rock Lock and Dam, including the Ottawa gauge. Flood stage is predicted to be reached Tuesday morning. If waters reach expected levels, backwater from the Fox River may reach the bank near OSF St. Elizabeth Medical Center in Ottawa.