WATCHES: Severe Thunderstorm Watch Number 219

WWUS20 KWNS 010549
SEL9
SPC WW 010549
ARZ000-KSZ000-MOZ000-OKZ000-011200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 219
NWS STORM PREDICTION CENTER NORMAN OK
1245 AM CDT FRI MAY 1 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

EXTREME NORTHWESTERN ARKANSAS
FAR SOUTHEASTERN KANSAS
SOUTHWESTERN MISSOURI
CENTRAL AND NORTHEASTERN OKLAHOMA

EFFECTIVE THIS FRIDAY MORNING FROM 1245 AM UNTIL 700 AM CDT.

HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
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 20 MILES NORTHEAST
OF FAYETTEVILLE ARKANSAS TO 30 MILES NORTH NORTHWEST OF OKLAHOMA
CITY OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 218...

DISCUSSION...SUPERCELLS IN CENTRAL OK ARE EXPECTED TO CONTINUE THE
COUPLE OF HOURS AND THEN GRADUALLY WEAKEN. HOWEVER...OTHER STORMS
ARE EXPECTED TO REDEVELOP ACROSS THE WATCH AREA THROUGH THE EARLY
MORNING HOURS AS LOW LEVEL JET STRENGTHENS/VEERS AND IMPINGES ON
WEAK BOUNDARY...STRETCHING SEWD FROM NORTH CENTRAL INTO EAST CENTRAL
OK. MUCAPES AOA 2000 J/KG AND EFFECTIVE SHEAR AT 40-50 KT WILL BE
SUPPORTIVE OF ROTATING STORMS. HOWEVER...A SLOWLY STABILIZING
BOUNDARY LAYER SUGGESTS LARGE HAIL SHOULD BE THE PRIMARY THREAT.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29025.

...IMY

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