National Weather Service

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Heat Advisory Parts of Southern Iowa Monday afternoon through Wednesday afternoon

Hazardous Weather Conditions

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Partly Cloudy

76°F

24°C

Humidity	88%
Wind Speed	E 6 mph
Barometer	29.90 in (1011.2 mb)
Dewpoint	72°F (22°C)
Visibility	10.00 mi
Heat Index	76°F (24°C)
Last update	1 Sep 8:53 pm CDT

More Information:

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

Extended Forecast for

Clear Lake IA

Severe T-storm Watch until September 2, 05:00am

Click here for hazard details and duration

Severe T-storm Watch

Severe T-storm Watch until September 2, 05:00am
NOW until 5:00am Wed
Severe T-storm Watch
Tonight
Low: 69 °F
Mostly Cloudy
then Chance
T-storms
Wednesday
High: 87 °F
Heavy Rain
Wednesday Night
Low: 69 °F
Mostly Clear
then Showers
Likely
Thursday
High: 87 °F
Chance
T-storms then
Chance
Showers
Thursday Night
Low: 70 °F
Mostly Clear
then Chance
T-storms
Friday
High: 87 °F
Chance
T-storms then
Chance
Showers
Friday Night
Low: 69 °F
Partly Cloudy
Saturday
High: 88 °F
Mostly Sunny

Detailed Forecast

Tonight

A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 69. East northeast wind 5 to 7 mph becoming north after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday

A 30 percent chance of showers and thunderstorms, mainly before 9am. Some of the storms could produce heavy rainfall. Mostly sunny, with a high near 87. Southeast wind 5 to 7 mph becoming west southwest in the afternoon. New rainfall amounts in excess of 4 inches possible.

Wednesday Night

Showers likely and possibly a thunderstorm between 1am and 2am, then a chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 69. Light and variable wind becoming east southeast around 5 mph after midnight. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday

A 50 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 87. East southeast wind 5 to 10 mph becoming south in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night

A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. South wind around 8 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday

A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night

Partly cloudy, with a low around 69.

Saturday

Mostly sunny, with a high near 88.

Saturday Night

A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.

Sunday

A 40 percent chance of showers. Mostly sunny, with a high near 84.

Sunday Night

Partly cloudy, with a low around 64.

Labor Day

Partly sunny, with a high near 79.