OVWA Regional Weather Alert from the Storm Prediction Center: WWUS20 KWNS 201914 SEL4 SPC WW 201914 ILZ000-INZ000-MIZ000-LMZ000-210200- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 504 NWS STORM PREDICTION CENTER NORMAN OK 215 PM CDT SAT SEP 20 2014 THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN ILLINOIS NORTHERN INDIANA SOUTHWEST LOWER MICHIGAN LAKE MICHIGAN * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 215 PM UNTIL 900 PM CDT. * PRIMARY THREATS INCLUDE... ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH OF BURLINGTON IOWA TO 50 MILES SOUTHEAST OF KALAMAZOO MICHIGAN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4). 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 503... DISCUSSION...EXPECT STORM COVERAGE AND INTENSITY TO GRADUALLY INCREASE ACROSS PARTS OF THE MIDWEST THROUGH LATE AFTN. BULK OF CONVECTION SHOULD FOCUS ALONG A PRE-FRONTAL TROUGH AXIS SITUATED FROM THE MS RIVER EAST-NORTHEAST ACROSS NORTHERN IL AND INTO NORTHERN IND AND SOUTHWEST MI. SBCAPE WITHIN THIS CORRIDOR WAS AROUND 2000 J/KG AND BOTH SHEAR AND LARGER SCALE FORCING ARE EXPECTED TO STRENGTHEN SUFFICIENTLY TO RESULT IN ORGANIZED STORMS AND A FEW SUPERCELLS CAPABLE OF GENERATING DAMAGING WINDS AND HAIL. STORM MERGERS AND INCREASING CONVERGENCE ALONG A COLD FRONT SETTLING INTO THE REGION LATER TODAY COULD MAINTAIN THE CHANCE FOR SEVERE STORMS...AT LEAST INTO THE EARLY EVENING. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 28025. ...CARBIN For more localized information on this severe weather situation, including warnings, go to the region page for your area. Region 1 (IL) facebook/OVWAReg1 Region 2 (IN) facebook/OVWAReg2 Region 3 (KY) facebook/OVWAReg3 Region 4 (OH) facebook/OVWAReg4 Specific county by county updates will be posted by the NWS shortly and relayed on the region pages.
Posted on: Sat, 20 Sep 2014 19:15:12 +0000
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