WATCHES: Tornado Watch Number 136

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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