SPC Severe Thunderstorm Watch 650
Thu, 09 Sep 2010 15:41:02 -0500
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 650 NWS STORM PREDICTION CENTER NORMAN OK 235 PM MDT THU SEP 9 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EXTREME EASTERN MONTANA WESTERN NORTH DAKOTA WESTERN SOUTH DAKOTA EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 235 PM UNTIL 1000 PM MDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHEAST OF WILLISTON NORTH DAKOTA TO 50 MILES SOUTHEAST OF RAPID CITY SOUTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0). 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. DISCUSSION...THUNDERSTORMS ARE BEGINNING TO DEVELOP FROM SE MT INTO WRN SD ALONG THE NOSE OF A DEEPLY MIXED BOUNDARY LAYER/STEEP LOW-LEVEL LAPSE RATES. AN INCREASE IN STORM COVERAGE/INTENSITY IS EXPECTED THROUGH THE AFTERNOON/EVENING AS THE LOW LEVELS CONTINUE TO DESTABILIZE S OF A WARM FRONT IN ND...AND AS A STRONG MIDLEVEL TROUGH MOVES NEWD FROM WRN WY. THERE WILL BE A SMALL WINDOW OF OPPORTUNITY FOR AN ISOLATED TORNADO IN SW ND LATE THIS AFTERNOON AS THE INITIAL CELLULAR STORMS INTERACT WITH THE SURFACE WARM FRONT. HOWEVER...SOMEWHAT MARGINAL MOISTURE AND WEAKER LOW-LEVEL SHEAR ACROSS WRN SD AND ERN MT...AS WELL AS A MORE STABLE BOUNDARY LAYER N OF THE WARM FRONT IN ND...WILL SUPPORT LARGE HAIL AND DAMAGING WINDS AS THE PRIMARY SEVERE THREATS. 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 450. MEAN STORM MOTION VECTOR 24035. ...THOMPSONRead more
SPC Severe Thunderstorm Watch 650
Thu, 09 Sep 2010 15:41:02 -0500
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 650 NWS STORM PREDICTION CENTER NORMAN OK 235 PM MDT THU SEP 9 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EXTREME EASTERN MONTANA WESTERN NORTH DAKOTA WESTERN SOUTH DAKOTA EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 235 PM UNTIL 1000 PM MDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHEAST OF WILLISTON NORTH DAKOTA TO 50 MILES SOUTHEAST OF RAPID CITY SOUTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0). 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. DISCUSSION...THUNDERSTORMS ARE BEGINNING TO DEVELOP FROM SE MT INTO WRN SD ALONG THE NOSE OF A DEEPLY MIXED BOUNDARY LAYER/STEEP LOW-LEVEL LAPSE RATES. AN INCREASE IN STORM COVERAGE/INTENSITY IS EXPECTED THROUGH THE AFTERNOON/EVENING AS THE LOW LEVELS CONTINUE TO DESTABILIZE S OF A WARM FRONT IN ND...AND AS A STRONG MIDLEVEL TROUGH MOVES NEWD FROM WRN WY. THERE WILL BE A SMALL WINDOW OF OPPORTUNITY FOR AN ISOLATED TORNADO IN SW ND LATE THIS AFTERNOON AS THE INITIAL CELLULAR STORMS INTERACT WITH THE SURFACE WARM FRONT. HOWEVER...SOMEWHAT MARGINAL MOISTURE AND WEAKER LOW-LEVEL SHEAR ACROSS WRN SD AND ERN MT...AS WELL AS A MORE STABLE BOUNDARY LAYER N OF THE WARM FRONT IN ND...WILL SUPPORT LARGE HAIL AND DAMAGING WINDS AS THE PRIMARY SEVERE THREATS. 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 450. MEAN STORM MOTION VECTOR 24035. ...THOMPSONRead more
SPC Severe Thunderstorm Watch 650 Status Reports
Thu, 09 Sep 2010 15:41:11 -0500
STATUS FOR WATCH 0650 HAS NOT BEEN ISSUED YETRead more
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