

000 

WWUS20 KWNS 261918

SEL3

SPC WW 261918

KSZ000-NEZ000-270300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 753

NWS STORM PREDICTION CENTER NORMAN OK

215 PM CDT SAT JUL 26 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL AND NORTHEAST KANSAS

       EXTREME SOUTH CENTRAL AND SOUTHEAST NEBRASKA



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 215 PM UNTIL

1000 PM CDT.



HAIL TO 3 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 NORTH AND SOUTH OF A LINE FROM 65 MILES NORTH

NORTHWEST OF RUSSELL KANSAS TO 25 MILES NORTH OF TOPEKA KANSAS.

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...THUNDERSTORMS ARE INTENSIFYING ALONG THE KS/NEB BORDER

TO THE NORTH OF HLC...WHILE ELEVATED STORMS ARE SPREADING EWD INTO

NORTH CENTRAL KS.  THE STORMS ARE LIKELY TO BECOME INCREASINGLY

SURFACE-BASED AS THEY MOVE EWD/ESEWD INTO LOW LEVEL

MOISTURE/INSTABILITY AXIS EXTENDING INTO EAST CENTRAL KS WHERE

SURFACE DEW POINTS ARE IN THE LOW/MID 70S AND MLCAPE IS 2500-3500

J/KG.  THIS AREA IS ALONG THE SRN EDGE OF STRONGER WESTERLY FLOW

ALOFT...AND WHEN COMBINED WITH THE LOW LEVEL EASTERLY WINDS IS

RESULTING IN EFFECTIVE BULK SHEAR OF 35-45 KT.  THE ENVIRONMENT

FAVORS DEVELOPMENT OF SUPERCELL STORMS CAPABLE OF PRODUCING LARGE

HAIL AND DAMAGING WIND GUSTS.  IF STORMS CAN GROW UPSCALE...A BOWING

MCS IS ALSO POSSIBLE WITH INCREASING THREAT OF MORE CONTINUOUS

WIDESPREAD DAMAGING WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 27020.





...WEISS

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