The National Weather Service has issued a flash flood warning for northwestern Woodbury County and northeastern Dakota County until 8:45 a.m.
The thunderstorm started before 6 a.m. Thursday morning, having already caused heavy rain to fall as of 6:15 a.m.
Expect water to pond on roadways and be cautious of hydroplaning and deep water on the roads.
Excessive runoff from heavy rainfall can cause flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other drainage areas and low lying spots, primarily Sioux City, South Sioux City, Sergeant Bluff and Dakota City and surrounding areas.
The National Weather Service said that if encountering flooded roads, turn around, don’t drown. when encountering.