THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN AND EASTERN MONTANA * EFFECTIVE THIS WEDNESDAY AFTERNOON AND THURSDAY MORNING FROM 525 PM UNTIL 100 AM MDT. * PRIMARY THREATS INCLUDE... SEVERAL VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH OF SIDNEY MONTANA TO 50 MILES SOUTH SOUTHWEST OF CUT BANK MONTANA. 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 441... DISCUSSION...TSTMS HAVE FORMED IN NE MT IN THE PAST 2 HOURS...IN ZONE OF LOW-LVL ASCENT AND INSTABILITY ALONG AND N OF WEAK WNW-ESE COLD FRONT. ADDITIONAL STORMS ARE EXPECTED TO CONTINUE FORMING IN THE REGION...MOVING/DEVELOPING ESE WITH THE FRONT. FARTHER W...A SEPARATE AREA OF SLIGHTLY POST-FRONTAL STORMS IS PRESENT ATTM ALONG THE ERN SLOPES OF THE RCKYS IN SW AB. THIS ACTIVITY SHOULD DEVELOP SEWD ALONG THE ERN SLOPES OF THE MOUNTAINS AND ADJACENT HIGH PLNS INTO N CNTRL MT AS THE FRONT CONTINUES SLOWLY SWD...WITH THE ACTIVITY FED BY ENHANCED UPSLOPE FLOW/MOISTURE TRANSPORT IN THE WAKE OF THE BOUNDARY. AS THE ENTIRE WW REGION WILL BE IN ZONE OF LARGE SCALE ASCENT AND MODERATE DEEP SHEAR DOWNSTREAM FROM UPR IMPULSE CROSSING AB/SK...SETUP MAY YIELD ADDITIONAL SCTD SUPERCELLS WITH A RISK FOR LARGE HAIL...LOCALLY DMGG WIND...AND PERHAPS AN ISOLD TORNADO. THE 01Z CONVECTIVE OTLK WILL BE ISSUED SLIGHTLY EARLY AND INCLUDE PARTS OF THE NRN HIGH PLNS IN A SLIGHT RISK AREA. 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 30030. ...CORFIDI -SWC-
Posted on: Wed, 24 Jul 2013 23:33:37 +0000
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