

649 

WWUS20 KWNS 110351

SEL8

SPC WW 110351

TXZ000-111000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 158

NWS STORM PREDICTION CENTER NORMAN OK

1055 PM CDT FRI MAY 10 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTH TEXAS



* EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1055 PM

  UNTIL 500 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES EITHER SIDE OF A LINE FROM 75 MILES WEST NORTHWEST

OF MCALLEN TEXAS TO 35 MILES NORTH NORTHEAST OF MCALLEN TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 157...



DISCUSSION...SEVERE THUNDERSTORMS ARE MOVING TOWARD WESTERN PARTS OF

SOUTH TEXAS. A MODERATELY UNSTABLE AIRMASS WITH STRONG DEEP LAYER

SHEAR EXISTS ACROSS SOUTH TEXAS. THIS ENVIRONMENT SHOULD SUPPORT

SEVERE THUNDERSTORM DEVELOPMENT DURING THE LATE EVENING AND

OVERNIGHT PERIOD WITH LARGE HAIL AND WIND DAMAGE POSSIBLE.



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 29030.





...BROYLES

