THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH421 IN EFFECT UNTIL 2 AM CDT SUNDAY FOR THE FOLLOWING AREASIN IOWA THIS WATCH INCLUDES 30 COUNTIESIN CENTRAL IOWABOONE DALLAS HAMILTONHARDIN JASPER MARSHALLPOLK STORY WEBSTERIN NORTHWEST IOWAPOCAHONTASIN SOUTH CENTRAL IOWACLARKE DECATUR LUCASMADISON MARION RINGGOLDUNION WARREN WAYNEIN SOUTHWEST IOWAADAIR ADAMS CASSTAYLORIN WEST CENTRAL IOWAAUDUBON CALHOUN CARROLLCRAWFORD GREENE GUTHRIESACTHIS INCLUDES THE CITIES OF ACKLEY, ADAIR, ADEL, ALLERTON, AMES,ATLANTIC, AUDUBON, BAYARD, BEDFORD, BOONE, CARLISLE, CARROLL,CASEY, CHARITON, CORNING, CORYDON, CRESTON, DENISON, DES MOINES,EARLHAM, EARLY, ELDORA, EXIRA, FONDA, FONTANELLE, FORT DODGE,GILMORE CITY, GREENFIELD, GUTHRIE CENTER, HUMESTON, INDIANOLA,IOWA FALLS, JEFFERSON, KNOXVILLE, LAKE CITY, LAKE VIEW, LAMONI,LAURENS, LENOX, LEON, MANSON, MARSHALLTOWN, MOUNT AYR,NEW MARKET, NEWTON, NORWALK, ODEBOLT, OSCEOLA, PANORA, PELLA,PERRY, POCAHONTAS, POMEROY, ROCKWELL CITY, ROLFE, SAC CITY,SCHALLER, SEYMOUR, STUART, WALL LAKE, WAUKEE, WEBSTER CITY,AND WINTERSET.* PRIMARY THREATS INCLUDE...SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75MPH POSSIBLE.ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE.A TORNADO OR TWO POSSIBLE.PROBABILITY TABLE:PROB OF 2 OR MORE TORNADOES : 20%PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES : 05%PROB OF 10 OR MORE SEVERE WIND EVENTS : 50%PROB OF 1 OR MORE WIND EVENTS >= 75 MPH : 30%PROB OF 10 OR MORE SEVERE HAIL EVENTS : 30%PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 20%PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 70%MEAN STORM MOTION /MPH/ : NE 40
