SPC Tornado Watch 676

By Newsroom America Feeds at 11 Nov 2012

WW 676 TORNADO AR LA OK TX 111855Z - 120100Z
URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 676 NWS STORM PREDICTION CENTER NORMAN OK 1255 PM CST SUN NOV 11 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHWEST ARKANSAS NORTHWEST LOUISIANA EXTREME SOUTHEAST OKLAHOMA NORTHEAST TEXAS EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL 700 PM CST. TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES SOUTH OF TYLER TEXAS TO 25 MILES NORTHWEST OF HOT SPRINGS ARKANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND 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. DISCUSSION...PRE-FRONTAL BAND OF STORMS OVER NERN TX INTO EXTREME SWRN AR IS EXPECTED TO SPREAD NEWD THIS AFTERNOON...WITH NEW STORM DEVELOPMENT CONTINUING ON THE SRN END OF THE BAND. ADDITIONAL STORMS MAY FORM ALONG THE ADVANCING COLD FRONT AS IT MOVES ACROSS NRN TX AND EXTREME SERN OK/SWRN AR. STRONG LOW LEVEL AND DEEP LAYER SHEAR COUPLED WITH SUFFICIENT INSTABILITY...ESPECIALLY OVER NERN TX WHERE CAPE IS NEAR 1000 J/KG...WILL PROMOTE INTENSIFICATION OF CONVECTION THIS AFTERNOON WITH A FEW SEVERE STORMS EXPECTED...INCLUDING A THREAT FOR SEVERAL TORNADIC SUPERCELLS. AVIATION...TORNADOES AND 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 22040. ...WEISS Read more

http://www.spc.noaa.gov/products/watch/ww0676.html

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