Posted by JAC on 4/17/2009, 11:57 am, in reply to "Strong Rotating Cells refiring over Cntrl TX"

URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 160 NWS STORM PREDICTION CENTER NORMAN OK 1025 AM CDT FRI APR 17 2009 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHEAST TEXAS COASTAL WATERS EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1025 AM UNTIL 500 PM CDT. TORNADOES...HAIL TO 2 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 75 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTH SOUTHEAST OF PORT ARTHUR TEXAS TO 50 MILES SOUTH SOUTHWEST OF COLLEGE STATION TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0). 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 159... DISCUSSION...MCS CURRENTLY OVER SCNTRL TEXAS WILL CONTINUE EWD ALONG A GRADIENT OF MODERATE INSTABILITY. A 45 TO 55 KT LOW-LEVEL JET WILL CREATE A LOW-LEVEL SHEAR ENVIRONMENT FAVORABLE FOR A FEW TORNADOES. AVIATION...TORNADOES AND 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 500. MEAN STORM MOTION VECTOR 24020. ...BROYLES/HART Hazard Tornadoes EF2+ Tornadoes Likelihood Moderate Low Severe Wind 65 kt+ Wind Moderate Moderate Severe Hail 2"+ Hail Moderate Moderate SEL0 URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 160 NWS STORM PREDICTION CENTER NORMAN OK 1025 AM CDT FRI APR 17 2009 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHEAST TEXAS COASTAL WATERS EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1025 AM UNTIL 500 PM CDT. TORNADOES...HAIL TO 2 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 75 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTH SOUTHEAST OF PORT ARTHUR TEXAS TO 50 MILES SOUTH SOUTHWEST OF COLLEGE STATION TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0). 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 159... DISCUSSION...MCS CURRENTLY OVER SCNTRL TEXAS WILL CONTINUE EWD ALONG A GRADIENT OF MODERATE INSTABILITY. A 45 TO 55 KT LOW-LEVEL JET WILL CREATE A LOW-LEVEL SHEAR ENVIRONMENT FAVORABLE FOR A FEW TORNADOES. AVIATION...TORNADOES AND 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 500. MEAN STORM MOTION VECTOR 24020. ...BROYLES/HART Hazard Tornadoes EF2+ Tornadoes Likelihood Moderate Low Severe Wind 65 kt+ Wind Moderate Moderate Severe Hail 2"+ Hail Moderate Moderate Note: Click for Watch Status Reports. WOUS64 KWNS 171521 WOU0 BULLETIN - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH OUTLINE UPDATE FOR WT 160 NWS STORM PREDICTION CENTER NORMAN OK 1025 AM CDT FRI APR 17 2009 TORNADO WATCH 160 IS IN EFFECT UNTIL 500 PM CDT FOR THE FOLLOWING LOCATIONS TXC015-039-041-051-071-089-157-167-185-199-201-239-245-291-313- 321-339-361-407-471-473-477-481-172200- /O.NEW.KWNS.TO.A.0160.090417T1525Z-090417T2200Z/ TX . TEXAS COUNTIES INCLUDED ARE AUSTIN BRAZORIA BRAZOS BURLESON CHAMBERS COLORADO FORT BEND GALVESTON GRIMES HARDIN HARRIS JACKSON JEFFERSON LIBERTY MADISON MATAGORDA MONTGOMERY ORANGE SAN JACINTO WALKER WALLER WASHINGTON WHARTON GMZ330-335-350-355-430-450-172200- /O.NEW.KWNS.TO.A.0160.090417T1525Z-090417T2200Z/ CW . ADJACENT COASTAL WATERS INCLUDED ARE MATAGORDA BAY GALVESTON BAY COASTAL WATERS FROM FREEPORT TO MATAGORDA SHIP CHANNEL TX OUT 20 NM COASTAL WATERS FROM HIGH ISLAND TO FREEPORT TX OUT 20 NM SABINE LAKE COASTAL WATERS FROM CAMERON LA TO HIGH ISLAND TX OUT 20 NM ATTN...WFO...HGX...LCH... Hazard Tornadoes EF2+ Tornadoes Likelihood Moderate Low Severe Wind 65 kt+ Wind Moderate Moderate Severe Hail 2"+ Hail Moderate Moderate Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas. SAW0 WW 160 TORNADO TX CW 171525Z - 172200Z AXIS..75 STATUTE MILES NORTH AND SOUTH OF LINE.. 55SSE BPT/PORT ARTHUR TX/ - 50SSW CLL/COLLEGE STATION TX/ ..AVIATION COORDS.. 65NM N/S /63SSW LCH - 57ESE AUS/ HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS. MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24020. LAT...LON 28129366 28829669 31009669 30299366 THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS FOR WOU0. Watch 160 Status Report Message has not been issued yet.