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069 

WWUS20 KWNS 200207

SEL4

SPC WW 200207

KSZ000-OKZ000-TXZ000-200900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 284

NWS STORM PREDICTION CENTER NORMAN OK

905 PM CDT SAT MAY 19 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH-CENTRAL AND SOUTHEAST KANSAS

       NORTHERN AND WESTERN OKLAHOMA

       NORTHWEST TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 905 PM

UNTIL 400 AM 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 60

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

CHANUTE KANSAS TO 35 MILES SOUTH SOUTHEAST OF ALTUS OKLAHOMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 281...WW 282...WW 283...



DISCUSSION...TWO SEPARATE CLUSTERS OF SEVERE STORMS ARE

ONGOING...ONE OVER W-CNTRL OK...AND THE OTHER OVER S-CNTRL KS...WITH

ADDITIONAL STORM FORMATION NOTED ALONG THE COLD FRONT ACROSS N-CNTRL

OK.  00Z OUN SOUNDING SHOWED THE PRESENCE OF A STRONG CAP WHICH

SHOULD LIMIT STORM DEVELOPMENT AND SUSTENANCE TO IMMEDIATE VICINITY

OF THE COLD FRONT.  GIVEN THE PRESENCE OF A MODESTLY MOIST...STEEP

LAPSE RATE THERMODYNAMIC ENVIRONMENT AND AROUND 40 KT OF EFFECTIVE

BULK SHEAR...SETUP WILL REMAIN SUPPORTIVE OF ORGANIZED

STORMS...INCLUDING SUPERCELLS AND BOWING STRUCTURES CAPABLE OF LARGE

HAIL AND DAMAGING WIND GUSTS.



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 27025.





...MEAD

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