

931 

WWUS20 KWNS 172201

SEL3

SPC WW 172201

KSZ000-OKZ000-TXZ000-180300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 163

NWS STORM PREDICTION CENTER NORMAN OK

500 PM CDT FRI APR 17 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHWEST KANSAS

       PARTS OF WESTERN OKLAHOMA

       PARTS OF EASTERN TEXAS PANHANDLE AND NORTHWEST TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 500 PM UNTIL

1000 PM CDT.



HAIL TO 2 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 40

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST

NORTHWEST OF GARDEN CITY KANSAS TO 145 MILES SOUTH SOUTHEAST OF

CHILDRESS 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.



OTHER WATCH INFORMATION...CONTINUE...WW 160...WW 161...WW 162...



DISCUSSION...THUNDERSTORMS WILL DEVELOP ALONG N/S DRY

LINE/CONVERGENCE ZONE WHERE AIR MASS HAS BECOME UNSTABLE AHEAD OF

STRONG UPPER LOW.  PRIMARY THREAT WILL BE LARGE HAIL...PARTICULARLY

ASSOCIATED WITH ANY SUPERCELL THAT IS ABLE TO DEVELOP. WHILE DEEP

LAYER SHEAR IS STRONG...LOW LEVEL SHEAR SHOULD RESULT IN PRIMARY

LARGE HAIL THREAT.



AVIATION...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 450. MEAN STORM

MOTION VECTOR 19030.





...HALES

