SPC Tornado Watch 15

WW 15 TORNADO LA TX CW 251355Z - 252100Z
URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 15 NWS STORM PREDICTION CENTER NORMAN OK 755 AM CST WED JAN 25 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF WESTERN AND SOUTHERN LOUISIANA SOUTHEAST TEXAS COASTAL WATERS EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 755 AM UNTIL 300 PM CST. TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH OF NATCHITOCHES LOUISIANA TO 30 MILES SOUTH SOUTHWEST OF PORT ARTHUR TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5). 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 14... DISCUSSION...NRN PARTS OF E TX SQLN EXPECTED TO CONTINUE ENEWD INTO RECOVERING BOUNDARY LAYER ENVIRONMENT NEAR DIFFUSE WNW-ESE WARM FRONT NOW EXTENDING FROM N OF LUFKIN TX TO NEAR BATON ROUGE LA. AREA VWP DATA SHOW 50+ KT SSWLY LLJ SHIFTING EWD IN TANDEM WITH SQLN...ENHANCING LOW LVL SHEAR AND STRENGTHENING LOW LVL MOISTURE TRANSPORT. WHILE MID LVL LAPSE RATES WILL REMAIN WEAK...COMBINATION OF INCREASING LOW LVL MOISTURE/SHEAR AND MODEST SFC HEATING MAY YIELD AN ENVIRONMENT FAVORABLE FOR LEWPS WITH LOCALLY DMGG WIND AND ISOLD TORNADOES. OTHER STORMS MAY ARISE LATER THIS MORNING OR EARLY THIS AFTN WITHIN CONFLUENCE BAND NOW OVER THE HOUSTON AREA AHEAD OF SQLN. ANY SUSTAINED STORMS FORMING WITH THIS ACTIVITY MAY POSE A TORNADO THREAT LATER TODAY OVER SW LA. AVIATION...TORNADOES AND 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 21035. ...CORFIDI Read more

http://www.spc.noaa.gov/products/watch/ww0015.html