THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF CENTRAL AND SOUTHERN ILLINOIS SOUTHWEST INDIANA WESTERN KENTUCKY SOUTHEAST MISSOURI * EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 205 PM UNTIL 900 PM CDT. * PRIMARY THREATS INCLUDE... SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE SEVERAL LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH NORTHWEST OF CHAMPAIGN ILLINOIS TO 40 MILES SOUTH SOUTHWEST OF PADUCAH KENTUCKY. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0). 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. && DISCUSSION...TSTMS FORMING ALONG LOW-LVL CONFLUENCE AXIS ATTM EXTENDING NNE FROM NEAR THE MO BOOTHEEL TO JUST E OF STL TO JUST W OF SPRINGFIELD IL EXPECTED INTENSIFY AS THEY MOVE/DEVELOP NNE INTO MORE STRONGLY-HEATED...MOISTENING ENVIRONMENT. MODERATE/LARGELY UNIDIRECTIONAL SWLY DEEP SHEAR...AND FORCING FOR ASCENT ASSOCIATED WITH VORT LOBE MOVING E AROUND BASE OF IA/MO UPR LOW...SUGGEST STORMS WILL EVOLVE INTO ONE OR MORE BANDS...WITH EMBEDDED LEWPS/BOWS POSING A RISK FOR LOCALLY DMGG WIND...MARGINALLY SVR HAIL...AND PERHAPS A TORNADO. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 22030. ...CORFIDI
Posted on: Sun, 09 Jun 2013 19:10:23 +0000
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