WATCHES: Severe Thunderstorm Watch Number 318

WWUS20 KWNS 212043
SEL8
SPC WW 212043
KSZ000-NEZ000-220400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 318
NWS STORM PREDICTION CENTER NORMAN OK
345 PM CDT SAT MAY 21 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

NORTH-CENTRAL AND NORTHEAST KANSAS
CENTRAL NEBRASKA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 345 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES EAST
NORTHEAST OF TOPEKA KANSAS TO 25 MILES NORTH NORTHWEST OF RUSSELL
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 316...WW 317...

DISCUSSION...HIGH-BASED TSTMS ONGOING OVER CNTRL NEB INTO N-CNTRL KS
ARE EXPECTED TO INTENSIFY AS THEY ENCOUNTER AN INCREASING MOIST AND
UNSTABLE AIR MASS WHERE MLCAPE HAS INCREASED TO 2000-2500 J/KG.
ADDITIONAL STORM DEVELOPMENT WILL BE POSSIBLE LATE THIS AFTERNOON
FROM VICINITY OF SURFACE LOW NEAR SLN SWD ALONG DRYLINE AS CAP IS
GRADUALLY ERODED. AREA PROFILER/VAD DATA SHOW VERTICALLY VEERING
WIND PROFILES WITH 35-40 KT OF DEEP-LAYER SHEAR WHICH WILL BE
SUPPORTIVE OF SUPERCELLS CAPABLE OF MAINLY LARGE 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 26025.

...MEAD

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