WATCHES: Severe Thunderstorm Watch Number 13

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

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