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WWUS20 KWNS 142201

SEL5

SPC WW 142201

ARZ000-OKZ000-TXZ000-150500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 175

NWS STORM PREDICTION CENTER NORMAN OK

500 PM CDT FRI MAY 14 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       ARKANSAS

       SOUTHEAST OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON FROM 500 PM UNTIL MIDNIGHT CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES NORTHEAST

OF PINE BLUFF ARKANSAS TO 55 MILES WEST SOUTHWEST OF DE QUEEN

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 170...WW 171...WW

172...WW 173...WW 174...



DISCUSSION...STORMS ARE EXPECTED TO CONTINUE TO INCREASE IN COVERAGE

AND INTENSITY AHEAD OF SLOW-MOVING MASS OF CONVECTION DRIFTING EWD

FROM SERN OK/NERN TX...AND ALONG RESIDUAL FRONTAL BOUNDARY BISECTING

AR. VERY UNSTABLE AIR MASS WITH MLCAPE AROUND 2000 J/G WILL CONTINUE

TO FUEL THIS ACTIVITY AMIDST WEAK LARGE SCALE FORCING FOR ASCENT.

REGION ALSO LIES BENEATH 30-40KT SLY FLOW IN THE ENTRANCE REGION OF

MID-LEVEL JET. THIS SHOULD CONTRIBUTE SUFFICIENT CLOUD-BEARING SHEAR

FOR ORGANIZED MULTICELL AND SUPERCELL STORMS WITH HAIL...WIND AND

EXCESSIVE RAIN POTENTIAL ALL INCREASE ACROSS THE WATCH ARE THROUGH

THE EVENING.



AVIATION...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 24025.





...CARBIN

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