

556 

WWUS20 KWNS 281256

SEL0

SPC WW 281256

ARZ000-LAZ000-TXZ000-282000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 630

NWS STORM PREDICTION CENTER NORMAN OK

755 AM CDT TUE JUL 28 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN ARKANSAS

       NORTHERN LOUISIANA

       NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 755 AM UNTIL

300 PM CDT.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHWEST OF

LONGVIEW TEXAS TO 5 MILES SOUTH OF MONROE LOUISIANA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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...TSTMS EXPECTED TO CONTINUE FORMING AHEAD OF NE TX UPR

VORT AS SYSTEM CONTINUES GENERALLY E INTO SRN AR THROUGH MIDDAY.

COMBINATION OF VERY RICH MOISTURE AVAILABILITY /PW AOA 2.25

INCHES/...APPRECIABLE LOW LVL SPEED/DIRECTIONAL SHEAR PER KSHV

VWP...AND INCREASING SBCAPE WITH SFC HEATING UPSTREAM ACROSS

CNTRL/SRN LA TOGETHER SUGGEST POTENTIAL FOR ISOLD TORNADOES AND WET

MICROBURSTS.



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

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 27025.





...CORFIDI

