Severe Storm Watch Until 1 AM Thursday. Conditions are ripe for strong to severe storm over much of southern Minnesota as warm, moisture-laden air surges northward, coupled with powerful jet stream winds aloft. The watch includes Mankato, Rochester, Hutchinson and the Twin Cities. The greatest risk is large hail, but a few isolated tornadoes can't be ruled out, along with training echoes capable of flash flooding in some communities. Details from NOAA:

 URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 126 NWS STORM PREDICTION CENTER NORMAN OK 645 PM CDT WED MAY 7 2014 THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHERN MINNESOTA EXTREME WEST CENTRAL WISCONSIN * EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 645 PM UNTIL 100 AM CDT. * PRIMARY THREATS INCLUDE... SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE A TORNADO OR TWO POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTHWEST OF REDWOOD FALLS MINNESOTA TO 30 MILES NORTH NORTHEAST OF ROCHESTER MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES.