

007 

WWUS20 KWNS 250438

SEL9

SPC WW 250438

TXZ000-251200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 39

NWS STORM PREDICTION CENTER NORMAN OK

1035 PM CST SUN FEB 24 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST AND WEST-CENTRAL TEXAS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1035 PM UNTIL

600 AM CST.



HAIL TO 1.5 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTH

SOUTHEAST OF SAN ANGELO TEXAS TO 80 MILES NORTH NORTHWEST OF

MINERAL WELLS TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



DISCUSSION...TSTMS HAVE RECENTLY DEVELOPED NEAR THE INTERSECTION OF

A SWD-MOVING COLD FRONT AND AN EWD-MOVING PACIFIC FRONT OVER THE LOW

ROLLING PLAINS WITH ADDITIONAL STORM DEVELOPMENT ANTICIPATED SWD

ALONG THE PACIFIC FRONT INTO THE CONCHO VALLEY.  A STRONG...SLY LLJ

WILL CONTINUE TO ADVECT AN INCREASINGLY MOIST BOUNDARY LAYER BENEATH

VERY STEEP MIDLEVEL LAPSE RATES /REFERENCE 00Z MAF SOUNDING/...

CONTRIBUTING TO MUCAPE VALUES APPROACHING 1000 J/KG WITHIN THE WARM

SECTOR.  GIVEN THE STRONG FORCING FOR ASCENT AND VERTICAL SHEAR

ATTENDANT TO THE DEEP-LAYER CYCLONE MOVING INTO THE SRN PLAINS...THE

SETUP WILL PROMOTE SEVERE STORMS CAPABLE OF LARGE HAIL AND DAMAGING

WIND GUSTS.



AVIATION...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 400. MEAN STORM

MOTION VECTOR 24035.





...MEAD



555 

WWUS20 KWNS 250438

SEL9

SPC WW 250438

TXZ000-251200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 39

NWS STORM PREDICTION CENTER NORMAN OK

1035 PM CST SUN FEB 24 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST AND WEST-CENTRAL TEXAS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1035 PM UNTIL

600 AM CST.



HAIL TO 1.5 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTH

SOUTHEAST OF SAN ANGELO TEXAS TO 80 MILES NORTH NORTHWEST OF

MINERAL WELLS TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



DISCUSSION...TSTMS HAVE RECENTLY DEVELOPED NEAR THE INTERSECTION OF

A SWD-MOVING COLD FRONT AND AN EWD-MOVING PACIFIC FRONT OVER THE LOW

ROLLING PLAINS WITH ADDITIONAL STORM DEVELOPMENT ANTICIPATED SWD

ALONG THE PACIFIC FRONT INTO THE CONCHO VALLEY.  A STRONG...SLY LLJ

WILL CONTINUE TO ADVECT AN INCREASINGLY MOIST BOUNDARY LAYER BENEATH

VERY STEEP MIDLEVEL LAPSE RATES /REFERENCE 00Z MAF SOUNDING/...

CONTRIBUTING TO MUCAPE VALUES APPROACHING 1000 J/KG WITHIN THE WARM

SECTOR.  GIVEN THE STRONG FORCING FOR ASCENT AND VERTICAL SHEAR

ATTENDANT TO THE DEEP-LAYER CYCLONE MOVING INTO THE SRN PLAINS...THE

SETUP WILL PROMOTE SEVERE STORMS CAPABLE OF LARGE HAIL AND DAMAGING

WIND GUSTS.



AVIATION...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 400. MEAN STORM

MOTION VECTOR 24035.





...MEAD

