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WWUS20 KWNS 221831

SEL5

SPC WW 221831

ARZ000-KSZ000-MOZ000-OKZ000-230200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 325

NWS STORM PREDICTION CENTER NORMAN OK

130 PM CDT SUN MAY 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       SOUTHEAST KANSAS

       SOUTHWEST AND CENTRAL MISSOURI

       EASTERN OKLAHOMA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900

PM CDT.



TORNADOES...HAIL TO 4 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF

JEFFERSON CITY MISSOURI TO 30 MILES SOUTH OF MUSKOGEE OKLAHOMA.

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 321...WW 322...WW

323...WW 324...



DISCUSSION...EXPLOSIVE TSTM DEVELOPMENT IS EXPECTED WITHIN THE NEXT

ONE TO TWO HOURS ALONG COLD FRONT MOVING THROUGH SERN KS AND NERN

OK.  WARM SECTOR AIR MASS IS QUITE MOIST WITH DEWPOINTS IN THE LOWER

70S.  WHEN COUPLED WITH STEEP MIDLEVEL LAPSE RATES...ENVIRONMENT HAS

BECOME STRONGLY TO EXTREMELY UNSTABLE WITH MLCAPE OF 3000-5000 J/KG.

THE PRESENCE OF 35-40 KT WLY DEEP-LAYER SHEAR WILL BE SUPPORTIVE OF

SUPERCELLS CAPABLE OF DESTRUCTIVE HAIL.  MOREOVER...SWRN EXTENSION

OF A 30-35 KT SWLY LLJ WILL BE MAINTAINED ACROSS THE

REGION...RESULTING IN EFFECTIVE SRH VALUES OF 150-250 M2/S2 AND AN

ASSOCIATED TORNADO THREAT.  A STRONG TORNADO OR TWO IS POSSIBLE.



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

SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE

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

600. MEAN STORM MOTION VECTOR 27025.





...MEAD

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