

506 

WWUS20 KWNS 271109

SEL8

SPC WW 271109

TXZ000-271800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 198

NWS STORM PREDICTION CENTER NORMAN OK

610 AM CDT MON APR 27 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL TEXAS



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 610 AM UNTIL 100

PM CDT.



TORNADOES...HAIL TO 1.5 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 110 STATUTE

MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHWEST OF

CORSICANA TEXAS TO 15 MILES EAST SOUTHEAST OF AUSTIN TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 197...



DISCUSSION...TSTMS...INCLUDING A FEW SUSTAINED

STORMS/SUPERCELLS...EXPECTED TO INCREASE ON ERN EDGE OF ELEVATED

CONVECTION DEVELOPING EWD FROM THE TX HILL COUNTRY.  COMBINATION OF

MODERATE...MOISTURE-RICH SLY LLJ...BACKED NEAR-SFC FLOW...AND

INCREASING LARGE SCALE ASCENT WITH APPROACH OF TX BIG BEND UPR VORT

EXPECTED TO SUPPORT LEWP/SMALL BOW STRUCTURES THAT MAY INCLUDE ISOLD

OR SHORT-LIVED TORNADOES...IN ADDITION TO DMGG WIND/SVR HAIL.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24030.





...CORFIDI

