

453 

WWUS20 KWNS 282038

SEL3

SPC WW 282038

TXZ000-290100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 13

NWS STORM PREDICTION CENTER NORMAN OK

240 PM CST THU JAN 28 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL TEXAS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 240 PM UNTIL

700 PM CST.



HAIL TO 1 INCH 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH

NORTHWEST OF DALLAS TEXAS TO 50 MILES SOUTHWEST OF WACO TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...ORGANIZED AND FAST MOVING SQUALL LINE IS APPROACHING

THE DFW METRO AREA...WITH A HISTORY OF DAMAGING WINDS.  BOUNDARY

LAYER AIRMASS APPEARS TO HAVE BARELY SUFFICIENT INSTABILITY TO ALLOW

STRONGER WIND GUSTS TO REACH THE SURFACE.  ACTIVITY WILL LIKELY

MAINTAIN A RISK OF LOCALLY DAMAGING WINDS FOR ANOTHER 2-3 HOURS AS

IT PROGRESSES ACROSS HIGH POPULATION AREAS.  STORMS ARE EXPECTED TO

WEAKEN AFTER DARK AS THEY MOVE EAST OF THE LOW LEVEL JET AXIS AND

INTO AN EVEN MORE STABLE ENVIRONMENT.



AVIATION...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 300. MEAN STORM MOTION

VECTOR 25045.





...HART

