

592 

WWUS20 KWNS 082243

SEL8

SPC WW 082243

ARZ000-OKZ000-TXZ000-090600-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 648

NWS STORM PREDICTION CENTER NORMAN OK

540 PM CDT WED SEP 8 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST ARKANSAS

       SOUTHERN AND EASTERN OKLAHOMA

       CENTRAL AND NORTHERN TEXAS



EFFECTIVE THIS WEDNESDAY AFTERNOON AND THURSDAY MORNING FROM 540

PM UNTIL 100 AM CDT.



TORNADOES...HAIL TO 1 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 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 5 MILES NORTHEAST OF MCALESTER

OKLAHOMA TO 25 MILES SOUTH SOUTHEAST OF CORSICANA TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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...SEVERAL SMALLER SCALE AREAS WITHIN LARGER SCALE REMNANT

CIRCULATION OF "HERMINE" APPEAR TO HAVE THE POTENTIAL FOR MAINLY

BRIEF TORNADOES THIS EVE: (1) ALONG LOW LVL CONFLUENCE AXIS IN ZONE

OF GREATEST LOW LVL THETA-E ALONG AND E OF I-35 IN N TX...(2) ALONG

BAND OF STORMS EMBEDDED IN WARM/MOISTURE-RICH AIR IN NE TX;

OUTFLOW-DOMINANT STORM LINE MOVING NWD FROM SHV AREA MAY COMPROMISE

PROBABILITIES FOR LOW LVL STORM ROTATION INITIALLY...BUT AREA WILL

HAVE BENEFIT OF LOW LVL JET SHIFTING NNE INTO SE OK LATER THIS

EVE...(3) AREA ALONG W-E WARM FRONT IN SW AR...WHERE DEEP SHEAR IS

WEAKER BUT ENHANCED LOW LVL DIRECTIONAL SHEAR EXISTS...AND (4) AREA

OF COMPARATIVELY LOWER THETA-E AIR NEAR LOW LVL MAIN CIRCULATION

CENTER IN NW TX/SW OK; ANY THREAT THAT DOES DEVELOP IN THIS REGION

SHOULD TO SHIFT ENE FROM TOWARD ADA LATER THIS EVE.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 21030.





...CORFIDI

