

680 

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

