

405 

WWUS20 KWNS 171545

SEL8

SPC WW 171545

TXZ000-172300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 178

NWS STORM PREDICTION CENTER NORMAN OK

1045 AM CDT MON MAY 17 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST TEXAS



EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1045 AM UNTIL 600

PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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 90 MILES NORTHWEST OF

ABILENE TEXAS TO 50 MILES SOUTH SOUTHEAST OF BROWNWOOD TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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...CLUSTER OF TSTMS OVER THE S PLAINS OF W TX CONTINUES TO

THRIVE AMIDST MLCAPE AXIS OF 2000-2500 J/KG.  ACTIVITY SHOULD

CONTINUE ESE ALONG A WEAK FRONT INTO PARTS OF NW/CNTRL TX THROUGH

THE AFTN.  WNWLY MID-LVL FLOW OF 30-35 KTS AND WEAK BUT MOIST SELY

LLVL FLOW WILL MAINTAIN THE THREAT FOR BOWING LINE SEGMENTS CAPABLE

OF DMGG WINDS.  LARGE HAIL CAN ALSO BE EXPECTED OWING TO VERY STEEP

MID-LVL LAPSE RATE ENVIRONMENT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 31040.





...RACY/HALES

