URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 428 NWS STORM PREDICTION CENTER NORMAN OK 245 PM CDT SUN JUL 21 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF NORTHERN NORTH DAKOTA * EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 245 PM UNTIL 1000 PM CDT. * PRIMARY THREATS INCLUDE... SEVERAL 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 POSSIBLE THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH OF MINOT NORTH DAKOTA TO 55 MILES SOUTHEAST OF GARRISON NORTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8). 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...FORCING FOR UPWARD VERTICAL MOTION ACCOMPANYING A VIGOROUS SHORT WAVE IMPULSE...AND ASSOCIATED SURFACE CYCLONE...PROGRESSING ACROSS SOUTHERN MANITOBA LATE THIS AFTERNOON AND EVENING IS EXPECTED TO CONTRIBUTE TO STRONG/SEVERE STORM DEVELOPMENT ACROSS NORTH CENTRAL NORTH DAKOTA. ACTIVITY IS EXPECTED TO INITIATE WEST NORTHWEST OF MINOT AFB DURING THE NEXT FEW HOURS...WITH MORE WIDELY SCATTERED ADDITIONAL DEVELOPMENT CONTINUING POSSIBLE SOUTHWARD ALONG/AHEAD OF A SURFACE TROUGH AXIS TOWARD THE BISMARCK AREA. STORMS...INCLUDING SUPERCELLS...ARE EXPECTED TO THEN ADVANCE EASTWARD...WITH AN UPSCALE GROWING CONVECTIVE CLUSTER POSSIBLE FROM NORTH CENTRAL INTO EASTERN NORTH DAKOTA LATER 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 500. MEAN STORM MOTION VECTOR 28030. ...KERR
Posted on: Sun, 21 Jul 2013 19:59:57 +0000
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