

439 

WWUS20 KWNS 100024

SEL5

SPC WW 100024

ARZ000-MOZ000-100700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 125

NWS STORM PREDICTION CENTER NORMAN OK

720 PM CDT THU APR 9 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF CENTRAL AND NORTHERN ARKANSAS

       SOUTHERN MISSOURI



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 720 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 55 MILES EAST NORTHEAST OF

SPRINGFIELD MISSOURI TO 30 MILES WEST SOUTHWEST OF PINE BLUFF

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 123...



DISCUSSION...BROKEN LINE OF SEVERE STORMS...WITH EMBEDDED

SUPERCELLS...WILL CONTINUE TO SPREAD EWD IN ADVANCE OF THE REMNANT

DRYLINE/COLD FRONT AND AN ASSOCIATED MID LEVEL TROUGH MOVING EWD

ACROSS OK.  THOUGH INSTABILITY DECREASES SOME WITH EWD

EXTENT...INCREASINGLY STEEP MID LEVEL LAPSE RATES AND NEAR 60 F

BOUNDARY LAYER DEWPOINTS SHOULD MAINTAIN MODERATE INSTABILITY ACROSS

SRN MO AND AR WELL INTO THE OVERNIGHT HOURS.  VERTICAL SHEAR WILL

ALSO REMAIN FAVORABLE FOR SUPERCELLS WITH AN ATTENDANT THREAT FOR A

FEW TORNADOES IN THE WARM SECTOR...AS WELL AS LARGE HAIL AND

DAMAGING WINDS.  THE AREAL EXTENT OF THE THREAT WILL BE GOVERNED BY

A STRONGER CAP NOTED OVER NE TX/NW LA...AND THE NWD PROGRESS OF THE

WARM FRONT INTO SRN MO.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 24035.





...THOMPSON

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