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000 

WWUS20 KWNS 132245

SEL6

SPC WW 132245

ARZ000-LAZ000-TXZ000-140700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 136

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CDT FRI APR 13 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PART OF SOUTHWEST ARKANSAS

       LARGE PART OF NORTHERN AND WESTERN LOUISIANA

       LARGE PART OF EASTERN TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY MORNING FROM 545 PM

UNTIL 200 AM CDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



DESTRUCTIVE TORNADOES...LARGE HAIL TO 2.5 INCHES IN DIAMETER...

THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE

POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 130 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES EAST NORTHEAST OF

TEXARKANA ARKANSAS TO 40 MILES SOUTHEAST OF HUNTSVILLE TEXAS.

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.



OTHER WATCH INFORMATION...CONTINUE...WW 133...WW 134...WW 135...



DISCUSSION...INTENSE SQUALL LINE HAS DEVELOPED NCENTRAL TX AND WILL

CONTINUE E INTO WATCH AREA.  AHEAD OF SQUALL LINE CONDITIONS ARE NOW

FAVORABLE FOR DEVELOPMENT OF SUPERCELLS ACROSS THE WATCH AREA WITH

VERY STRONG SHEAR AND INCREASINGLY MOIST AND UNSTABLE AIR MASS.  THE

PARAMETERS IN PLACE SUGGEST POTENTIAL FOR STRONG TO VIOLENT

TORNADOES DEVELOPING DURING THE EVENING.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24040.





...HALES

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