WWUS20 KWNS 102055
SEL1
SPC WW 102055
ARZ000-LAZ000-OKZ000-TXZ000-110400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 11
STREAMWIZE STORM PREDICTION
255 PM CST WED MAR 10 2010

THE STREAMWIZE STORM PREDICTION HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

         ARKANSAS
         LOUISIANA
         OKLAHOMA
         TEXAS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 255 PM UNTIL
1000 PM CST.

TORNADOES...HAIL TO 3 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 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHWEST OF HARRISON
ARKANSAS TO 45 MILES SOUTH SOUTHEAST OF TYLER TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).

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...

DISCUSSION... CONVECTION IS RAPIDLY DEVELOPING ACROSS EAST TX
AND INTO EASTERN OK ALONG DRYLINE ADVACING EAST IN RESPONCE TO
SHRT-WV/VORT OVER SW OK... CONTINUED WAA COMBINED WITH STEEP
MID LEVEL LAPSE RATES 7-7.5C/KM IS AIDING MLCAPE 1000-1500J/KG...
STRONG EFFECTIVE SHEAR 60-70KNTS ALONG WITH 18Z SOUNDINGS FROM
LCH/JAN INDICATE DISCRETE SUPERCELLS MAY DEVELOP AHEAD OF
DRYLINE/COLD FRONT... WITH POTENTIAL FOR TORNADOES.. LARGE HAIL
AND DAMAGING WINDS... WIND POTENTIAL WILL INCREASE TONIGHT AS
DEVELOPING LINE IN TX BECOME LINEAR.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 26030.


...WARNER