

885 

WWUS20 KWNS 130312

SEL5

SPC WW 130312

ARZ000-OKZ000-131000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 395

NWS STORM PREDICTION CENTER NORMAN OK

1010 PM CDT FRI JUN 12 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN ARKANSAS

       CENTRAL AND EASTERN OKLAHOMA



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1010 PM

UNTIL 500 AM CDT.



HAIL TO 2.5 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 65 MILES EAST OF

FORT SMITH ARKANSAS TO 25 MILES WEST NORTHWEST OF OKLAHOMA CITY

OKLAHOMA.  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 390...WW 392...WW

393...WW 394...



DISCUSSION...TSTMS HAVE BEGUN TO FORM IN THE PAST 30 MINUTES N OF

TIGHTENING WSW-ENE ORIENTED CONFLUENCE AXIS THROUGH CNTRL/ERN OK.

NOCTURNAL READJUSTMENT/VEERING/STRENGTHENING OF LOW LVL WIND

FIELD...CONTINUING PRESENCE OF EML...AND LARGE RESERVOIR OF VERY

MOIST AIR S OF CONFLUENCE AXIS TOGETHER SUGGEST GOOD CHANCE OF VERY

LARGE HAIL AND LOCALLY DMGG WIND.  AMPLE DEEP SHEAR IS PRESENT FOR

SUPERCELLS.  LOW LVL SHEAR WILL INCREASE WITH EWD EXTENT IN WW...AND

ERN HALF OF WW MAY REQUIRE UPGRADE TO TORNADO LATER TONIGHT IF STORM

MODE/MOVEMENT BECOME SUPPORTIVE OF SEMI-DISCRETE STRUCTURES.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 28020.





...CORFIDI

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