

284 

WWUS20 KWNS 101404

SEL5

SPC WW 101404

TXZ000-CWZ000-101900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 155

NWS STORM PREDICTION CENTER NORMAN OK

905 AM CDT FRI MAY 10 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  UPPER TEXAS COAST

  COASTAL WATERS



* EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 905 AM UNTIL

  200 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EITHER SIDE OF A LINE FROM 50 MILES NORTHEAST OF

HOUSTON TEXAS TO 10 MILES WEST OF PALACIOS TEXAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU5).



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 154...



DISCUSSION...RELATIVELY WELL-ORGANIZED CLUSTERS OF INTENSE STORMS

WILL PERSIST WHILE MOVING ESEWD ACROSS THE UPPER TX COAST THROUGH

THE REST OF THE MORNING. THIS ACTIVITY IS BEING FUELED BY A PLUME OF

VERY UNSTABLE AIR STREAMING ACROSS AN OUTFLOW BOUNDARY LEFT IN THE

WAKE OF EARLIER MCS NOW MOVING OVER SE LA/MS DELTA. EXPECT GRADUAL

INCREASE IN CONVECTIVE VIGOR AS STORMS ENCOUNTER SOME INCREASE IN

DIURNAL DESTABILIZATION BEFORE MOVING OVER THE WRN GULF LATER. UNTIL

THEN...SHEAR PROFILES FROM HGX AND CRP SOUNDING SHOW MORE THAN

ADEQUATE SHEAR FOR SUPERCELL STRUCTURES AND/OR LINE SEGMENTS WITH

BOTH LARGE HAIL AND DMG WIND POTENTIAL.



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 29035.





...CARBIN

