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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 311

NWS STORM PREDICTION CENTER NORMAN OK

205 PM CDT SUN JUN 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST KANSAS

       NORTHWEST OKLAHOMA

       NORTHEAST TEXAS PANHANDLE



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 205 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES EAST SOUTHEAST OF

BORGER TEXAS TO 40 MILES NORTH NORTHEAST OF DODGE CITY KANSAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 309...WW 310...



DISCUSSION...STORM INITIATION HAS OCCURRED A BIT EARLY TODAY NEAR

TRIPLE-POINT LOW NORTH OF AMA. ADDITIONAL ATTEMPTS AT STORM

DEVELOPMENT WERE OCCURRING ATOP RECOVERING STABLE LAYER AND ALONG

WELL-DEFINED OUTFLOW BOUNDARY SITUATED ACROSS NWRN OK. MOST OF THIS

ACTIVITY STILL APPEARS TO BE STRUGGLING IN THE PRESENCE OF MODEST

INHIBITION AND WEAK BACKGROUND ASCENT. EXPECT A GRADUAL INCREASE IN

STORM DEVELOPMENT POTENTIAL AS CONTINUED SURFACE HEATING AND

PERSISTENT LOW LEVEL FORCING/MIXING CONTINUE TO OVERCOME INHIBITION.



VISIBLE SATELLITE WAS INDICATING THE POTENTIAL FOR STRONG SURFACE

HEATING TO OCCUR BEHIND THE OUTFLOW BOUNDARY...FROM NWRN OK INTO

SRN/SWRN KS...WHERE ELY COMPONENT OF THE LOW LEVEL WIND FIELD MAY BE

MAINTAINED. THUS...IN ADDITION TO SUFFICIENT DEEP-LAYER SHEAR FOR

SUPERCELLS GIVEN BAND OF 40-50KT MID LEVEL FLOW...ANY DISCRETE

CONVECTION SPREADING EAST NEAR AND NORTH OF THE REMNANT OUTFLOW

BOUNDARY WILL HAVE ACCESS TO ENHANCED SR INFLOW AND SRH SUPPORTIVE

OF TORNADOES.

EXPECT OVERALL EVOLUTION TO GREATER TORNADO THREAT MAY TAKE A FEW

MORE HOURS. HOWEVER...ISOLATED DISCRETE RIGHT-MOVING CELL NOW

DEVELOPING IN THE NRN TX PNHDL SUPPORTS EARLIER WATCH ISSUANCE.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 23020.





...CARBIN

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