WATCHES: Severe Thunderstorm Watch Number 518

WWUS20 KWNS 252129
SEL8
SPC WW 252129
IAZ000-KSZ000-MOZ000-NEZ000-260500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 518
NWS STORM PREDICTION CENTER NORMAN OK
430 PM CDT WED JUL 25 2012

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

WESTERN IOWA
NORTH-CENTRAL AND NORTHEAST KANSAS
FAR NORTHWEST MISSOURI
EASTERN AND SOUTH-CENTRAL NEBRASKA

EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 430 PM UNTIL MIDNIGHT 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 85
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST
SOUTHWEST OF CONCORDIA KANSAS TO 10 MILES NORTHEAST OF TEKAMAH
NEBRASKA. 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.

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY LATE THIS AFTERNOON AND EVENING AHEAD OF SLOW-MOVING COLD
FRONT AND PRE-FRONTAL WIND SHIFT WITHIN A THERMODYNAMIC ENVIRONMENT
CHARACTERIZED BY MLCAPE OF 2500-4000 J/KG AND DCAPE OF 1500-1900
J/KG. THOUGH VERTICAL SHEAR WILL REMAIN MARGINAL FOR STORM
ORGANIZATION...THE DEGREE OF INSTABILITY WILL PROMOTE VIGOROUS
UP/DOWNDRAFTS CAPABLE OF DAMAGING WINDS AND SOME LARGE HAIL.

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 29020.


...MEAD

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