Active Weather Pattern Expected From the Midwest to the Southern Plains; Dangerous Heat Likely in Southern Texas

A strong storm system will bring numerous to widespread severe thunderstorms across portions of the Midwest and Upper Great Lakes Tuesday. Tornadoes (a few strong), damaging winds and large hail are expected. Record high temperatures will be possible over southern Texas the next several days. This may lead to dangerous heat concerns especially for areas already without power. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Partly Cloudy

74°F

23°C

Humidity	82%
Wind Speed	S 9 mph
Barometer	29.76 in (1006.3 mb)
Dewpoint	68°F (20°C)
Visibility	10.00 mi
Last update	21 May 10:51 pm CDT

More Information:

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

Extended Forecast for

Saint Charles MO

Tornado Watch May 21, 11:06pm until May 22, 12:00am

Click here for hazard details and duration

Tornado Watch

Tornado Watch May 21, 11:06pm until May 22, 12:00am
NOW until 12:00am Wed
Tornado Watch
Tonight
Low: 61 °F
Severe
Thunderstorms
Wednesday
High: 77 °F
Sunny then
Chance
Showers
Wednesday Night
Low: 61 °F
Chance
T-storms
Thursday
High: 82 °F
Chance
T-storms
Thursday Night
Low: 67 °F
Chance
T-storms then
Showers
Likely
Friday
High: 83 °F
Showers
Friday Night
Low: 58 °F
Chance
T-storms
Saturday
High: 79 °F
Sunny

Detailed Forecast

Tonight

A 50 percent chance of showers and thunderstorms, mainly before 1am. Some of the storms could be severe. Cloudy early, then gradual clearing, with a low around 61. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 24 mph.

Wednesday

A slight chance of showers between noon and 1pm, then a chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 77. West wind 6 to 8 mph. Chance of precipitation is 40%.

Wednesday Night

A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 61. Northwest wind around 5 mph becoming calm in the evening.

Thursday

A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 82. Light and variable wind becoming southeast around 6 mph in the morning.

Thursday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 67. Southeast wind around 6 mph. Chance of precipitation is 60%.

Friday

Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 80%.

Friday Night

A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 58.

Saturday

Sunny, with a high near 79.

Saturday Night

A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.

Sunday

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 60%.

Sunday Night

Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 60. Chance of precipitation is 60%.

Memorial Day

A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78.

Monday Night

A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60.

Tuesday

A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 77.