The National Weather Service says severe storms are possible in the Evansville area through midday Thursday.
Forecasters say large hail and damaging winds are the primary hazards, but they say a few tornadoes are possible near frontal boundaries.
Heavy rain flooded numerous roads in the Tri-State Wednesday morning.
The National Weather Service recorded more than an inch of rain in Evansville between 9:00 and 10:00 a.m. Some areas saw higher amounts.
Emergency personnel rescued drivers from high water, especially on rural roads.
In northern Posey County, multiple accidents were reported on I-64 between state roads 69 and 165, as water rose on the interstate.
The weather service says strong thunderstorms will be possible through noon Thursday across southwest Indiana and western Kentucky.