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036 

WWUS20 KWNS 012311

SEL6

SPC WW 012311

ARZ000-020500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 606

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT SAT SEP 1 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN ARKANSAS



EFFECTIVE THIS SATURDAY NIGHT FROM 610 PM UNTIL MIDNIGHT CDT.



HAIL TO 1 INCH 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 EAST AND WEST OF A LINE FROM 25 MILES NORTH OF

LITTLE ROCK ARKANSAS TO 35 MILES SOUTHWEST OF MONTICELLO

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 602...WW 603...WW

604...WW 605...



DISCUSSION...CURRENT LITTLE ROCK RADAR DATA INDICATE STORMS EVOLVING

INTO LINE SEGMENTS WITH CONSIDERABLE COLD POOL GENERATION.  GIVEN

THE INFLUX OF A HOT AND VERY MOIST BOUNDARY LAYER WITH MLCAPE OF

1000-1500 J/KG AND INFLUENCE OF VORTICITY MAXIMUM TRANSLATING EWD

THROUGH THE OZARK PLATEAU...EXPECT CONTINUED UPSCALE GROWTH OF

ONGOING STORMS INTO A SEWD-PROGRESSING QLCS BY LATE EVENING INTO

TONIGHT.  DAMAGING WINDS WILL BE THE PRIMARY HAZARD THROUGH SOME

HAIL WILL ALSO BE POSSIBLE.



AVIATION...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 500. MEAN STORM MOTION

VECTOR 27030.





...MEAD

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