Supercell thunderstorms could produce tornadoes or large hail across central and southeastern Iowa Sunday evening.

The National Weather Service has issued a tornado warning for 41 counties in Iowa, extending from east of the Des Moines metro area to the state's southeast corner.

The Des Moines metro area, Ames, Iowa City, Cedar Rapids, the Quad Cities, and Burlington are all under watch until 12:00 a.m. Monday, Sept. 19.

The weather service warned that supercell thunderstorm risk would increase around 7 p.m., especially east of I-35 and south of I-80.

Storm Prediction Center says conditions are favourable for supercells that can produce 3-inch hail, 75-mph winds, and a few tornados.

Where you are determines what you should do in the event that a watch or warning is issued.

Tornado safety:

Adair, Adams, Appanoose, Benton, Boone, Cedar, Clarke, Dallas, Davis, Decatur, Des Moines, Guthrie, Henry, Iowa, Jasper, Jefferson, Johnson, , 

Affected counties include 

Mahaska, Marion, Marshall, Monroe, Muscatine, Polk, Poweshiek, Ringgold, Scott, Story, Tama, Taylor, Union, Van Buren, Wapello, Warren, Washington and Wayne 

Some clouds will be moving through on Sunday Night. There is a chance of isolated severe thunderstorms. Low 62F. Winds light and variable.



Monday will be sunny. High temperature around 85°F. Winds from the east to the southeast at 5 to 10 mph.

Clear skies are expected for Monday night. Temperatures in the low to mid 70's Winds SSE at 5 to 10 mph.

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