Lala Approaching Hawaii; Flash Flooding Risks; Excessive Heat

Lala, may become a hurricane, is expected to impact Hawaii this weekend. Heavy rainfall, strong winds, dangerous surf and localized flooding are expected. Heavy rainfall and flash flooding concerns from the mid-Mississippi Valley, Ohio Valley into the central Appalachians continues, with the threat shifting toward the mid-Atlantic later this weekend. Record heat continues for areas of the South. Read More >

Hazardous Weather Conditions

Extreme Heat Warning until August 16, 09:00 PM CDT

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fog/Mist

80°F

27°C

Humidity	90%
Wind Speed	SE 3 mph
Barometer	30.03 in (1016.3 mb)
Dewpoint	77°F (25°C)
Visibility	6.00 mi
Heat Index	86°F (30°C)
Last update	14 Aug 10:53 pm CDT

More Information:

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

Extended Forecast for

O'Fallon IL

Extreme Heat Warning August 14, 11:47pm until August 16, 09:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning August 14, 11:47pm until August 16, 09:00pm
NOW until 9:00pm Sun
Extreme Heat Warning
Tonight
Low: 77 °F
Partly Cloudy
Saturday
High: 95 °F
Slight Chance
T-storms then
Mostly Sunny
Saturday Night
Low: 77 °F
Mostly Clear
Sunday
High: 95 °F
Partly Sunny
Sunday Night
Low: 72 °F
Chance
T-storms
Monday
High: 87 °F
Slight Chance
Showers then
Slight Chance
T-storms
Monday Night
Low: 68 °F
Partly Cloudy
Tuesday
High: 89 °F
Mostly Sunny

Detailed Forecast

Tonight

Partly cloudy, with a low around 77. Southeast wind around 6 mph.

Saturday

A slight chance of showers and thunderstorms between 8am and 10am. Mostly cloudy, then gradually becoming sunny, with a high near 95. Heat index values as high as 110. Light and variable wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 20%.

Saturday Night

Mostly clear, with a low around 77. Calm wind becoming southwest around 5 mph after midnight.

Sunday

Partly sunny, with a high near 95. Heat index values as high as 109. Northwest wind 5 to 8 mph.

Sunday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. North wind around 6 mph. Chance of precipitation is 50%.

Monday

A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 87. Chance of precipitation is 20%.

Monday Night

Partly cloudy, with a low around 68.

Tuesday

Mostly sunny, with a high near 89.