Heavy rain and fog had settled over St. Louis early Thursday, with temperatures around 73 degrees and visibility reduced to about a mile and a quarter. Showers and thunderstorms are expected to continue through the morning, and some storms could produce heavy rain before the afternoon turns more scattered.
A Flood Watch remains in effect for St. Louis City, St. Louis County and nearby areas through 1 p.m. Thursday, according to the National Weather Service. Excessive runoff could cause flooding in rivers, creeks, streams and other low-lying or flood-prone locations.
The Rain Should Ease, But Storms Linger
Storm chances are highest through midday, with hourly rain chances gradually dropping from around 80% in the morning to isolated storms by late afternoon. St. Louis is expected to reach about 81 degrees, with a light south wind and cloudy skies hanging around for much of the day.
Tonight stays mostly cloudy, with scattered showers and thunderstorms, a low near 72 and a 50% chance of rain. Friday brings a warmer 89-degree high and a 30% chance of storms, while another round of showers may develop Friday night.
A Fast Turn Toward Heat
The weekend forecast takes a sharp turn from soggy to steamy, with Saturday reaching about 91 degrees after a slight early storm chance. Sunday should be mostly sunny near 93, followed by a sunny Monday with a high near 95.
The National Weather Service says heat index values could climb above 100 degrees Saturday and potentially reach 105 or higher Sunday and Monday. That means outdoor plans may feel considerably hotter than the thermometer suggests, especially during the afternoon.
Flood Safety Comes First
Anyone traveling during the morning downpours should avoid flooded roads and low spots, and never drive or walk through water of unknown depth. The National Weather Service flood safety guidance puts it plainly: turn around rather than risk being swept into dangerous water.
