WWUS20 KWNS 101942
SEL6
SPC WW 101942
TXZ000-110300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 156
NWS STORM PREDICTION CENTER NORMAN OK
235 PM CDT FRI MAY 10 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
  SOUTH-CENTRAL TEXAS

* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 235 PM UNTIL
  1000 PM CDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL SIGNIFICANT DAMAGING WIND GUSTS TO 80 MPH POSSIBLE
  SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
  A FEW TORNADOES POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90
STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES WEST NORTHWEST
OF SAN ANGELO TEXAS TO 35 MILES EAST NORTHEAST OF COTULLA TEXAS. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).

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.

&&

DISCUSSION...STORMS ARE FORECAST TO INCREASE ACROSS PARTS OF CENTRAL
AND SOUTHERN TX THROUGH THE LATE AFTERNOON AND THROUGH THIS EVENING.
NUMEROUS BOUNDARIES ACROSS THE REGION AS WELL AS A STRONGER FRONTAL
SURGE SPREADING SEWD LATER TODAY/TONIGHT WILL HELP TO FOCUS STORMS
AMIDST POCKETS OF STRONG TO LOCALLY EXTREME INSTABILITY. STORMS ALSO
INITIATING OVER THE MOUNTAINS OF NRN COAHUILA MEXICO SHOULD TRACK
EWD ACROSS THE RIO GRANDE AND FURTHER POSE A THREAT OF SEVERE HAIL
AND WIND. SHEAR ACROSS THE REGION WILL REMAIN MODERATE TO STRONG
WITH INTENSE HIGH LEVEL WINDS SUPPORTING MASS EVACUATION AND UPDRAFT
POTENCY. IN ADDITION TO VERY LARGE HAIL AND A POSSIBLY EVOLVING
DAMAGING WIND THREAT...AN ISOLATED TORNADO CANNOT BE RULED OUT WITH
ANY DISCRETE CELL FORMING PREFERENTIALLY ON/ALONG REMNANT AND
STORM-SCALE BOUNDARIES WHERE LOW LEVEL MOISTURE AND SHEAR WILL BE
MAXIMIZED.

AVIATION...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 28025.


...CARBIN