URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 352 NWS STORM PREDICTION CENTER NORMAN OK 440 PM MDT SUN JUN 23 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EASTERN COLORADO * EFFECTIVE THIS SUNDAY AFTERNOON FROM 440 PM UNTIL MIDNIGHT 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 60 MILES NORTH NORTHWEST OF AKRON COLORADO TO 50 MILES SOUTH SOUTHEAST OF LA JUNTA COLORADO. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2). 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 351... DISCUSSION...TSTMS NOW FORMING OVER THE HIGHER TERRAIN OF CNTRL CO...AND IN THE LEE OF THE RCKY MTN FOOTHILLS...EXPECTED TO INCREASE AND MOVE/DEVELOP GENERALLY NEWD THROUGH LATE TNGT/EARLY MON AS LOW-LVL SELY FLOW PERSISTS AHEAD OF APPROACHING DISTURBANCE ON SRN FRINGE OF UPR JET. 35-40 KT WLY DEEP SHEAR SHOULD SUPPORT A FEW SUSTAINED STORMS/SUPERCELLS WITH LARGE HAIL/LOCALLY DMGG WIND DESPITE SOMEWHAT MODEST MOISTURE NOW PRESENT. INCREASING UPR-LVL DIVERGENCE WITH THE CONTINUED ENE MOTION OF UPR IMPULSE...AND ARRIVAL OF SOMEWHAT MORE SUBSTANTIAL BOUNDARY LAYER MOISTURE FROM KS...SUGGEST THAT THE ACTIVITY COULD EVOLVE INTO AN E OR ESE-MOVING CLUSTER BY MID-EVE. 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 24020.
Posted on: Sun, 23 Jun 2013 23:07:43 +0000
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