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WWUS20 KWNS 202135

SEL6

SPC WW 202135

KSZ000-210400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 506

NWS STORM PREDICTION CENTER NORMAN OK

435 PM CDT TUE JUL 20 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PART OF WESTERN AND CENTRAL KANSAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 435 PM UNTIL

1100 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST OF

GARDEN CITY KANSAS TO 35 MILES NORTH OF HUTCHINSON KANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



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 502...WW 503...WW

504...WW 505...



DISCUSSION...TSTMS SHOULD CONTINUE TO DEVELOP ALONG LOW-LEVEL

BAROCLINIC ZONE ORIENTED NE-SW ACROSS THE AREA THROUGH THE EVENING.

BOUNDARY LAYER ALONG AND SOUTH OF THIS FRONT IS QUITE HOT AND

RELATIVELY MOIST...AND WHEN COUPLED WITH STEEP LOW- TO MIDLEVEL

LAPSE RATES...AIR MASS HAS BECOME MODERATELY UNSTABLE WITH MLCAPE OF

1500-2500 J/KG.  THIS INSTABILITY IN COMBINATION WITH SUFFICIENT

DEEP-LAYER SHEAR /I.E. 30-40 KT/ WILL BE SUPPORTIVE OF ORGANIZED

MULTICELL AND MARGINAL SUPERCELL STORM CLUSTERS WITH THE THREAT FOR

HAIL AND 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 28020.





...MEAD

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