A storm system that's dropping snow on the western half of the state will bring up to four inches of rain to the St. Louis area by Sunday.
But don't expect much in the way of flash flooding, says National Weather Service hydrologist Mark Fuchs.
"We're not necessarily expecting flash flooding in the classic sense - where you see a very quick rising water coming down the stream," Fuchs said. "But with that being said, there will be some roads in poor drainage areas that could go underwater."
Fuchs says the steady rain is already causing travel problems in southern counties. And it means no relief for the already high Mississippi and Missouri rivers.
"Those rivers are going to be up a long time. Obviously with this current rain event, they aren't going down anytime soon," Fuchs said. "And indeed we are forecasting a new crest on the Mississippi in points upstream and downstream."
Fuchs says the Missouri River will rise, but probably not reach flood stage.
Follow Chris McDaniel on Twitter: @csmcdaniel
