P3: Comlabs-Weather-server: THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF PARTS OF CENTRAL AND SOUTHERN ILLINOIS WEST CENTRAL AND SOUTHWESTERN INDIANA EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 345 PM UNTIL 1000 PM CDT. 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 THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES EITHER SIDE OF A LINE FROM 10 MILES NORTH OF SPRINGFIELD ILLINOIS TO 5 MILES SOUTHEAST OF BLOOMINGTON INDIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8). 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 507, DISCUSSION,THUNDERSTORMS HAVE BEGUN INCREASING NEAR A WEAK SURFACE LOW OVER NORTH CENTRAL ILLINOIS AND EAST-SOUTHEASTWARD ALONG A WEAK WARM FRONT. CU FIELD IS ALSO INCREASING SOUTHWESTWARD FROM THE LOW ALONG A WEAK COOL FRONT --ALL WITHIN A VERY MOIST ENVIRONMENT WHERE DAYTIME HEATING HAS YIELDED 2500 TO 3000 J/KG MIXED-LAYER CAPE. SHEAR IS SUFFICIENT FOR MULTICELL/LINEAR ORGANIZATION -- AND PERHAPS LOW-LEVEL ROTATION ALONG THE WARM FRONTAL ZONE WHERE SURFACE WINDS ARE BACKED. THOUGH AN ISOLATED/BRIEF TORNADO WILL BE POSSIBLE NEAR THIS BOUNDARY,LARGE HAIL AND LOCALLY DAMAGING WINDS WILL BE THE MAIN SEVERE RISKS --PARTICULARLY IF CONVECTION GROWS UPSCALE INTO AN ORGANIZED/SOUTHWARD-MOVING CLUSTER AS CURRENTLY APPEARS POSSIBLE. 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 31030.
Posted on: Sat, 31 Aug 2013 21:16:52 +0000
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