Tornado Watch Until 9 PM. NOAA SPC has issued a Tornado Watch which encompasses much of central and southern Minnesota, including the Twin Cities metro area, meaning conditions are ripe for isolated supercell T-storms capable of large hail and a few tornadoes. Stay alert for severe storms, the best chance between 6 PM and 8 PM this evening in Minneapolis/St. Paul and suburbs. Details:

 URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 474 NWS STORM PREDICTION CENTER NORMAN OK 225 PM CDT TUE AUG 6 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF CENTRAL MINNESOTA SOUTHEASTERN NORTH DAKOTA NORTHWESTERN WISCONSIN * EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 225 PM UNTIL 900 PM CDT. * PRIMARY THREATS INCLUDE... A FEW TORNADOES POSSIBLE SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTH NORTHWEST OF ORTONVILLE MINNESOTA TO 60 MILES EAST NORTHEAST OF MINNEAPOLIS MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND 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. && DISCUSSION...AS A 50+ KT WESTERLY 500 MB JET STREAK CONTINUES TO NOSE EASTWARD ACROSS THE NORTHERN PLAINS/UPPER MISSISSIPPI VALLEY REGION LATE THIS AFTERNOON...DESTABILIZATION IS EXPECTED TO BECOME SUFFICIENT FOR SUPERCELL DEVELOPMENT IN THE WARM SECTOR OF A WEAK SURFACE WAVE. WITH SOME STRENGTHENING OF SOUTHERLY LOW-LEVEL FLOW FIELDS...A REMNANT EFFECTIVE WARM FRONTAL ZONE ACROSS CENTRAL MINNESOTA INTO THE MINNEAPOLIS AREA WILL PROVIDE A POTENTIAL FOCUS FOR TORNADIC DEVELOPMENT THROUGH EARLY EVENING. OTHERWISE...THE EVOLUTION OF AN ORGANIZED MESOSCALE CONVECTIVE SYSTEM MAY EVENTUALLY OCCUR NEAR THE LOW AND ALONG A DEVELOPING COLD FRONT TRAILING TO THE WEST...WHICH SHOULD PROPAGATE EAST SOUTHEASTWARD WITH THE RISK FOR SEVERE WINDS AND HAIL ACROSS THE UPPER MISSISSIPPI VALLEY BY THIS EVENING. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 29035.