

252 

WWUS20 KWNS 272142

SEL8

SPC WW 272142

KSZ000-OKZ000-280300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 528

NWS STORM PREDICTION CENTER NORMAN OK

440 PM CDT SAT JUN 27 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHEAST KANSAS

       PARTS OF NORTH AND WEST OKLAHOMA



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 440 PM UNTIL

1000 PM CDT.



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 40

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTH

SOUTHWEST OF GAGE OKLAHOMA TO 20 MILES EAST NORTHEAST OF CHANUTE

KANSAS.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 525...WW 526...WW 527...



DISCUSSION...WEAK FRONTAL ZONE STRETCHES FROM ERN KS SWWD INTO TX

PANHANDLE.  ALONG AND AHEAD OF FRONT THE AIR MASS IS HOT WITH

CONSIDERABLE INSTABILITY PARTICULARLY ERN PORTION OF WATCH.  PULSE

TYPE THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY VICINITY

FRONTAL CONVERGENCE.  HIGH BASES WITH DCAPES IN EXCESS OF 1500

J/KG...SUPPORTS POTENTIAL FOR DAMAGING DOWNBURST WINDS WITH ANY

STRONG UPDRAFT THAT DEVELOPS.  STORM MOTION WILL BE SLOW WITH THE

VERY WARM AIRMASS LIMITING THE HAIL SIZE TO GENERALLY LESS THAN 2

INCHES IN MOST INTENSE STORMS.



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 550. MEAN STORM

MOTION VECTOR 2705.





...HALES

