Severe Weather Threat and Extreme Temperatures Impacting Portions of the Southern U.S

Strong to severe thunderstorms are expected to develop from central Texas into the Ohio Valley and Great Lakes Wednesday. Areas who will see the greatest chances for damaging hail and winds will be from north Texas to the Ozarks. Parts of south Texas and Florida will experience dangerous to extreme heat over the next several days. Dangerous heat stress may continue into early next week. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

63°F

17°C

Humidity	84%
Wind Speed	Calm
Barometer	29.96 in
Dewpoint	58°F (14°C)
Visibility	10.00 mi
Last update	22 May 10:35 pm CDT

More Information:

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

Extended Forecast for

Alton IL

Tonight
Low: 58 °F
Partly Cloudy
then Chance
Showers
Thursday
High: 81 °F
Chance
Showers then
Partly Sunny
Thursday Night
Low: 67 °F
Partly Cloudy
then Chance
Showers
Friday
High: 84 °F
Showers
Likely
Friday Night
Low: 60 °F
Chance
T-storms
Saturday
High: 81 °F
Sunny
Saturday Night
Low: 65 °F
Slight Chance
T-storms then
T-storms
Likely
Sunday
High: 83 °F
Showers
Sunday Night
Low: 62 °F
Showers
Likely

Detailed Forecast

Tonight

A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 58. Calm wind. Chance of precipitation is 40%.

Thursday

A 30 percent chance of showers and thunderstorms, mainly before 11am. Partly sunny, with a high near 81. Southeast wind 3 to 7 mph.

Thursday Night

A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 67. Southeast wind around 7 mph. Chance of precipitation is 50%.

Friday

Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

Friday Night

A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 60. South wind 6 to 10 mph becoming northwest after midnight.

Saturday

Sunny, with a high near 81.

Saturday Night

Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.

Sunday

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

Sunday Night

Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. Chance of precipitation is 60%.

Memorial Day

A 30 percent chance of showers. Mostly sunny, with a high near 76.

Monday Night

A 20 percent chance of showers. Mostly clear, with a low around 59.

Tuesday

A 20 percent chance of showers and thunderstorms. Sunny, with a high near 78.

Tuesday Night

Mostly clear, with a low around 57.

Wednesday

Sunny, with a high near 79.