

742 

WWUS20 KWNS 111857

SEL6

SPC WW 111857

ARZ000-LAZ000-OKZ000-TXZ000-120100-



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



931 

WWUS20 KWNS 111857

SEL6

SPC WW 111857

ARZ000-LAZ000-OKZ000-TXZ000-120100-



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

