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265 

WWUS20 KWNS 171524

SEL0

SPC WW 171524

TXZ000-CWZ000-172200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 160

NWS STORM PREDICTION CENTER NORMAN OK

1025 AM CDT FRI APR 17 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1025 AM UNTIL

500 PM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTH SOUTHEAST OF

PORT ARTHUR TEXAS TO 50 MILES SOUTH SOUTHWEST OF COLLEGE STATION

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 159...



DISCUSSION...MCS CURRENTLY OVER SCNTRL TEXAS WILL CONTINUE EWD ALONG

A GRADIENT OF MODERATE INSTABILITY. A 45 TO 55 KT LOW-LEVEL JET WILL

CREATE A LOW-LEVEL SHEAR ENVIRONMENT FAVORABLE FOR A FEW TORNADOES.



AVIATION...TORNADOES AND 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 24020.





...BROYLES/HART

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