SPC Severe Thunderstorm Watch 432

WW 432 SEVERE TSTM TX 262025Z - 270300Z
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 432 NWS STORM PREDICTION CENTER NORMAN OK 325 PM CDT TUE JUN 26 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTH CENTRAL AND SOUTHEAST TEXAS EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 325 PM UNTIL 1000 PM CDT. HAIL TO 2 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 50 STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES SOUTHEAST OF COLLEGE STATION TEXAS TO 45 MILES SOUTH SOUTHWEST OF SAN ANTONIO TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2). 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 431... DISCUSSION...STORMS ARE DEVELOPING TO THE NORTHWEST OF HOUSTON WITHIN AN ENVIRONMENT CHARACTERIZED BY STEEP LAPSE RATES AND A DEEPLY MIXED BOUNDARY LAYER. SURFACE TEMPERATURES NEAR 100 AND DEW POINTS OF 60-65 ARE CONTRIBUTING TO AMPLE INSTABILITY /SBCAPE OF 2500-3500 J PER KG/ FOR STRONG UPDRAFTS...AND LOWER LEVEL INVERTED-V STRUCTURE SI RESULTING IN STRONG DCAPE OF 1200-1500 J/KG. STORMS WILL HAVE POTENTIAL TO PRODUCE DAMAGING WIND GUSTS AND LARGE HAIL AS THEY DEVELOP/SPREAD SWWD AT 25-30 KT. 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 550. MEAN STORM MOTION VECTOR 05025. ...WEISS Read more

http://www.spc.noaa.gov/products/watch/ww0432.html