SEL7 URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 337 NWS STORM PREDICTION CENTER NORMAN OK 150 PM MDT FRI JUN 21 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHEAST COLORADO WESTERN NEBRASKA WESTERN SOUTH DAKOTA EASTERN WYOMING * EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 150 PM UNTIL 900 PM MDT. * PRIMARY THREATS INCLUDE... SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE A FEW TORNADOES POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES EAST AND WEST OF A LINE FROM 70 MILES NORTHWEST OF RAPID CITY SOUTH DAKOTA TO 60 MILES SOUTH SOUTHWEST OF SIDNEY NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7). 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. && OTHER WATCH INFORMATION...CONTINUE...WW 335...WW 336... DISCUSSION...THUNDERSTORM INITIATION IS UNDERWAY WITHIN A MOIST LOW-LEVEL UPSLOPE REGIME ACROSS THE NORTH CENTRAL HIGH PLAINS. FURTHER DEVELOPMENT AND INTENSIFICATION IS EXPECTED THROUGH LATE AFTERNOON AND EARLY EVENING...IN THE PRESENCE OF STRONG DEEP LAYER SHEAR AND MODERATE TO STRONG INSTABILITY. THE ENVIRONMENT IS CONDUCIVE TO SUPERCELLS CAPABLE OF PRODUCING LARGE HAIL AND LOCALLY STRONG WIND GUSTS. A FEW...MAINLY BRIEF/WEAK...TORNADOES ARE NOT OUT OF THE QUESTION. AVIATION...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 25020. ...KERR WW0337 Initial Radar image WW0337 WOU WW0337 SAW WW0337 Warnings WW0337 Probability Top
Posted on: Fri, 21 Jun 2013 23:38:22 +0000
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