Saturday, August 4, 2007

WATCHES: Severe Thunderstorm Watch Number 563

WWUS20 KWNS 042245
SEL3
SPC WW 042245
NEZ000-050400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 563
NWS STORM PREDICTION CENTER NORMAN OK
545 PM CDT SAT AUG 4 2007

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

CENTRAL NEBRASKA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 545 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH
SOUTHWEST OF NORTH PLATTE NEBRASKA TO 55 MILES EAST OF BURWELL
NEBRASKA. 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.

OTHER WATCH INFORMATION...CONTINUE...WW 562...

DISCUSSION...INTENSE THUNDERSTORMS EXPECTED TO CONTINUE/DEVELOP
INVOF SURFACE COLD FRONT SAGGING SWD INTO CENTRAL NEB THIS EVENING.
AIR MASS IS VERY UNSTABLE AND MODERATELY SHEARED. DESPITE WARM AIR
ALOFT...DEGREE OF INSTABILITY...LOW LEVEL CONVERGENCE AND SUFFICIENT
SHEAR FOR ROTATING UPDRAFTS ALL FAVOR THREATS OF LARGE HAIL/DAMAGING
WINDS WITH THE STRONGER STORMS.

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 600. MEAN STORM
MOTION VECTOR 33015.


..EVANS

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