

957 

WWUS20 KWNS 042244

SEL7

SPC WW 042244

OKZ000-TXZ000-050500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 277

NWS STORM PREDICTION CENTER NORMAN OK

540 PM CDT TUE JUN 4 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN OKLAHOMA

  NORTHWEST TEXAS



* EFFECTIVE THIS TUESDAY AFTERNOON FROM 540 PM UNTIL MIDNIGHT

  CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 80

    MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO

    2.5 INCHES IN DIAMETER POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES EAST

NORTHEAST OF GUYMON OKLAHOMA TO 50 MILES WEST SOUTHWEST OF

MINERAL WELLS TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 276...



DISCUSSION...SCATTERED DISCRETE STORM DEVELOPMENT APPEARS UNDERWAY

NEAR THE DRYLINE ACROSS THE SOUTHERN HIGH PLAINS.  LOWER/MID

TROPOSPHERIC FLOW FIELDS ARE GENERALLY WEAK...BUT DEEP LAYER SHEAR

IS SUFFICIENT FOR UPDRAFT ROTATION IN THE PRESENCE OF THERMODYNAMIC

PROFILES CHARACTERIZED BY STEEP MID-LEVEL LAPSE RATES AND LARGE

CAPE.  A COUPLE OF TORNADOES MAY NOT BE OUT OF THE QUESTION...BUT

SIZABLE LOW-LEVEL TEMPERATURE-DEW POINT SPREADS WILL CONTRIBUTE TO

STRONG/COOL OUTFLOW...WHICH PROBABLY WILL QUICKLY UNDERCUT

MESOCYCLONES.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29020.





...KERR

