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The National Weather Service in Des Moines has issued a Severe Thunderstorm Warning for Central Marion County in south central Iowa Until midnight CDT. At 1059 PM CDT, a severe thunderstorm was located near Knoxville Municipal Airport, or near Knoxville, moving southeast at 10 mph.
Hazard: 60 mph wind gusts and quarter size hail.
Source: Radar indicated.
Impact: Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. Locations impacted include Pella, Knoxville, Pleasantville, Melcher-Dallas, Knoxville Raceway, Lake Red Rock, Harvey, Pella Municipal Airport, Knoxville Municipal Airport, and Elk Rock State Park.

For your protection move to an interior room on the lowest floor of a building.

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 276 IN EFFECT UNTIL 3 AM CDT SATURDAY FOR THE FOLLOWING AREAS IN IOWA THIS WATCH INCLUDES 20 COUNTIES IN CENTRAL IOWA JASPER POWESHIEK IN SOUTH CENTRAL IOWA APPANOOSE CLARKE DECATUR LUCAS MADISON MAHASKA MARION MONROE RINGGOLD UNION WARREN WAYNE IN SOUTHEAST IOWA DAVIS WAPELLO IN SOUTHWEST IOWA ADAIR ADAMS CASS TAYLOR THIS INCLUDES THE CITIES OF ADAIR, ALBIA, ALLERTON, ATLANTIC, BEDFORD, BLOOMFIELD, CARLISLE, CENTERVILLE, CHARITON, CORNING, CORYDON, CRESTON, EARLHAM, FONTANELLE, GREENFIELD, GRINNELL, HUMESTON, INDIANOLA, KNOXVILLE, LAMONI, LENOX, LEON, MOUNT AYR, NEW MARKET, NEWTON, NORWALK, OSCEOLA, OSKALOOSA, OTTUMWA, PELLA, SEYMOUR, STUART, AND WINTERSET.
Primary Threats Include: SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE. SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE. A TORNADO OR TWO POSSIBLE. PROBABILITY TABLE: PROB OF 2 OR MORE TORNADOES : 20% PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES : 10% PROB OF 10 OR MORE SEVERE WIND EVENTS : 40% PROB OF 1 OR MORE WIND EVENTS >= 75 MPH : 10% PROB OF 10 OR MORE SEVERE HAIL EVENTS : 40% PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 30% PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 70% MEAN STORM MOTION /MPH/ : E 30