Severe Weather and Heavy Rainfall in the Ohio Valley; Heat Continuing in the South and Southeast

Severe thunderstorms with damaging wind gusts will be possible from the mid-Mississippi Valley into parts of the Ohio Valley and central Appalachians tonight. Heavy rain associated with these storms may lead to considerable flash and urban flooding impacts across portions of the Ohio Valley. Mid-summer heat persists from the Central Plains to the Southeast. Read More >

Hazardous Weather Conditions

Extreme Heat Warning until August 13, 08:00 PM CDT

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

79°F

26°C

Humidity	88%
Wind Speed	S 6 mph
Barometer	29.87 in
Dewpoint	75°F (24°C)
Visibility	10.00 mi
Heat Index	83°F (28°C)
Last update	12 Aug 2:55 am CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

2 Miles WNW Saint Jacob IL

Extreme Heat Warning August 12, 03:17am until August 13, 08:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning August 12, 03:17am until August 13, 08:00pm
NOW until 8:00pm Thu
Extreme Heat Warning
Overnight
Low: 78 °F
Mostly Clear
Wednesday
High: 94 °F
Mostly Sunny
then Slight
Chance
T-storms
Wednesday Night
Low: 76 °F
Chance
T-storms
Thursday
High: 92 °F
Slight Chance
T-storms then
Mostly Sunny
Thursday Night
Low: 77 °F
Partly Cloudy
Friday
High: 96 °F
Mostly Sunny
Friday Night
Low: 77 °F
Mostly Clear
Saturday
High: 98 °F
Hot

Detailed Forecast

Overnight

Mostly clear, with a low around 78. Southwest wind around 6 mph.

Wednesday

A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 94. Heat index values as high as 109. Southwest wind 5 to 7 mph.

Wednesday Night

A 30 percent chance of showers and thunderstorms, mainly after 3am. Partly cloudy, with a low around 76. East wind around 6 mph becoming south after midnight.

Thursday

A 20 percent chance of showers and thunderstorms before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 103. South wind 3 to 7 mph.

Thursday Night

Partly cloudy, with a low around 77. South wind 5 to 7 mph.

Friday

Mostly sunny, with a high near 96.

Friday Night

Mostly clear, with a low around 77.

Saturday

Sunny and hot, with a high near 98.

Saturday Night

Mostly clear, with a low around 77.

Sunday

Sunny, with a high near 96.