

000 

WWUS20 KWNS 140255

SEL6

SPC WW 140255

TXZ000-140900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 316

NWS STORM PREDICTION CENTER NORMAN OK

955 PM CDT TUE MAY 13 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL TEXAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 955 PM

UNTIL 400 AM CDT.



HAIL TO 2.5 INCHES 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST

NORTHWEST OF COLLEGE STATION TEXAS TO 40 MILES SOUTH OF AUSTIN

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 312...WW 314...WW 315...



DISCUSSION...MCS WILL CONTINUE ADVANCING EWD ACROSS CENTRAL TX

OVERNIGHT...AND MAY EVOLVE INTO A MORE LINEAR SYSTEM AND INCREASE

ITS FORWARD SPEED.  AIR MASS IS VERY UNSTABLE WITH STEEP LAPSE RATES

AND STRONG DEEP LAYER SHEAR...ENHANCING THE POTENTIAL FOR LARGE HAIL

WITH THE STRONGER CORES.  WIND DAMAGE THREAT WOULD ALSO INCREASE IF

SYSTEM CONSOLIDATES ALONG LEADING OUTFLOW BOUNDARY AND SURGES ENEWD

INTO CENTRAL TX.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 26035.





...EVANS

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