WATCHES: Severe Thunderstorm Watch Number 474

WWUS20 KWNS 022232
SEL4
SPC WW 022232
NEZ000-SDZ000-030500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 474
NWS STORM PREDICTION CENTER NORMAN OK
435 PM MDT MON JUL 2 2007

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

NEBRASKA PANHANDLE
FAR WESTERN SOUTH DAKOTA

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 435 PM UNTIL
1100 PM MDT.

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 EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF
BUFFALO SOUTH DAKOTA TO 15 MILES SOUTHWEST OF SIDNEY NEBRASKA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 472...WW 473...

DISCUSSION...STRONG HEATING AND SURFACE CONVERGENCE ERODED CAPPING
WITH A MODERATELY UNSTABLE AIR MASS OVER THE REGION LATE THIS
AFTERNOON. EFFECTIVE SHEAR OF 40-50 KT WILL BE MORE THAN FAVORABLE
FOR SUPERCELLS...AND WILL ENHANCE THE POTENTIAL FOR LARGE HAIL AND
DAMAGING WINDS AS ISOLATED CELLS SHIFT ESEWD THROUGH THE EVENING.

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 29015.

..EVANS

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