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WWUS20 KWNS 082337

SEL7

SPC WW 082337

ARZ000-LAZ000-TXZ000-CWZ000-090700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 877

NWS STORM PREDICTION CENTER NORMAN OK

530 PM CST TUE NOV 8 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND EASTERN ARKANSAS

       WESTERN AND CENTRAL LOUISIANA

       EAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 530

PM UNTIL 100 AM CST.



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 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF PINE

BLUFF ARKANSAS TO 25 MILES EAST SOUTHEAST OF PORT ARTHUR TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 875...WW 876...



DISCUSSION...TSTMS...INCLUDING POSSIBLE SUPERCELLS...EXPECTED TO

PERSIST THROUGH AT LEAST MID EVE ALONG PRE-FRONTAL N-S CONFLUENCE

LINE IN E TX AND WRN/SRN LA.  OTHER STORMS MAY CONTINUE TO FORM

ALONG THE FRONT IN SW AR.  WITH TIME THE STORMS SHOULD MOVE/DEVELOP

GENERALLY NEWD. WHILE DIMINISHING LOW LVL CAPE ULTIMATELY WILL

WEAKEN UPDRAFT STRENGTH...CONTINUING PRESENCE OF RICH MOISTURE

INFLOW/SELY SFC WINDS LIKELY WILL MAINTAIN SOME RISK FOR

TORNADOES/LOCALLY DMGG WIND IN E TX/LA.

FARTHER N...COMPARATIVELY WEAKER LOW LVL LAPSE RATES/MORE LIMITED

MOISTURE MAY BE OFFSET BY STRONGER DEEP SHEAR/FORCING FOR ASCENT

ASSOCIATED WITH THE CONTINUED NE MOVEMENT OF OK UPR TROUGH TO

MAINTAIN A RISK FOR ISOLD TORNADOES/DMGG WIND IN SRN/ERN AR.  THIS

THREAT ULTIMATELY MAY EXTEND STILL FARTHER N/NE INTO CNTRL/NERN

AR...ALTHOUGH CONFIDENCE IN SVR THREAT IN THOSE AREAS ATTM SEEMS TOO

LOW TO WARRANT A WW.



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

450. MEAN STORM MOTION VECTOR 23035.





...CORFIDI

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