

825 

WWUS20 KWNS 020036

SEL7

SPC WW 020036

KSZ000-OKZ000-020600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 417

NWS STORM PREDICTION CENTER NORMAN OK

740 PM CDT WED JUN 1 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST KANSAS

       OKLAHOMA PANHANDLE



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 740 PM

UNTIL 100 AM 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH OF

GARDEN CITY KANSAS TO 25 MILES EAST SOUTHEAST OF GUYMON OKLAHOMA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 412...WW 414...WW

415...WW 416...



DISCUSSION...SMALL BOWING COMPLEX OF TSTMS IS EXPECTED TO

MOVE/DEVELOP EWD ACROSS THE WATCH AREA THIS EVENING.  INFLOW AIR

MASS IS CHARACTERIZED BY STEEP LAPSE RATES AND A DEEP SUB-CLOUD

LAYER WITH MLCAPE/DCAPE VALUES OF AROUND 1500 J/KG.  WHEN COUPLED

WITH 40 KT OF DEEP-LAYER SHEAR...ENVIRONMENT WILL SUPPORT

FORWARD-PROPAGATION OF CONVECTIVE SYSTEM WITH THE PRIMARY HAZARD

BEING DAMAGING WIND GUSTS.



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 500. MEAN STORM

MOTION VECTOR 27035.





...MEAD

