WWUS20 KWNS 212326
SEL9
SPC WW 212326
TXZ000-220700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 339
NWS STORM PREDICTION CENTER NORMAN OK
625 PM CDT FRI JUN 21 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
  WEST TEXAS

* EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 625 PM
  UNTIL 200 AM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE
  A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH
NORTHWEST OF AMARILLO TEXAS TO 60 MILES SOUTHWEST OF DRYDEN
TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 336...WW 337...WW 338...

DISCUSSION...SO FAR...ONLY ISOLATED STORMS EXIST NEAR THE TX/NM
BORDER AND ACROSS FAR WEST TX/BIG BEND AREA. AIRMASS TO THE EAST OF
THE ONGOING STORMS IS MODERATELY UNSTABLE AND LARGE SCALE ASCENT MAY
BE ENHANCED THROUGH THE EVENING AS A SRN STREAM DISTURBANCE SPREADS
EAST FROM NM. A WELL-MIXED BOUNDARY LAYER AND ADEQUATE SHEAR THROUGH
THE CLOUD-BEARING LAYER SHOULD SUPPORT SUPERCELL STORMS WITH BOTH
LARGE HAIL AND HIGH WIND THREATS. OVERALL STORM COVERAGE MAY REMAIN
QUITE SCATTERED BUT JUST ABOUT ANY CONVECTION WILL BE CAPABLE OF
SEVERE WEATHER GIVEN SUPPORTIVE ENVIRONMENTAL PARAMETERS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 27020.


...CARBIN