

000 

WWUS20 KWNS 160708

SEL9

SPC WW 160708

TXZ000-161400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 399

NWS STORM PREDICTION CENTER NORMAN OK

205 AM CDT SAT JUN 16 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH TEXAS



EFFECTIVE THIS SATURDAY MORNING FROM 205 AM UNTIL 900 AM CDT.



HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EITHER SIDE OF A LINE FROM 35 MILES EAST OF AUSTIN

TEXAS TO 45 MILES WEST OF COTULLA TEXAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU9).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 398. WATCH NUMBER 398 WILL NOT

BE IN EFFECT AFTER 205 AM CDT.



DISCUSSION...FORWARD-PROPAGATING MCS WITH EMBEDDED BOWING SEGMENTS

EXPECTED TO CONTINUE MAINLY ESE THROUGH SUNRISE.  AREA WIND PROFILES

AND LOW LEVEL MOISTURE DISTRIBUTION SUGGEST THREAT FOR LOCALLY

DAMAGING WIND/WET MICROBURSTS AS SELY LOW LEVEL WINDS CONTINUE

BENEATH MODERATE WNW/NW FLOW ALOFT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 30030.





...CORFIDI

