WATCHES: Severe Thunderstorm Watch Number 439

WWUS20 KWNS 032001
SEL9
SPC WW 032001
NEZ000-SDZ000-040300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 439
NWS STORM PREDICTION CENTER NORMAN OK
300 PM CDT SAT JUL 3 2010

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

MUCH OF WESTERN NEBRASKA
PARTS OF SOUTHWEST SOUTH DAKOTA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 300 PM UNTIL
1000 PM CDT.

HAIL TO 2.5 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 30 MILES EAST
SOUTHEAST OF SIDNEY NEBRASKA TO 75 MILES NORTH NORTHEAST OF
CHADRON NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 INCREASING IN NUMBER/INTENSITY ACROSS
THE HIGHER TERRAIN OF SERN WY. WITH GREATER INSTABILITY TO THE E
ACROSS THE WATCH AREA COUPLED WITH CONTINUED HEATING...SEVERE
THUNDERSTORMS ARE LIKELY TO DEVELOPS EWD WITH POTENTIAL FOR
SUPERCELLS. LARGE HAIL WILL BE THE PRIMARY THREAT
INITIALLY...PARTICULARLY WITH SUPERCELLS. HOWEVER STEEP LAPSE RATES
AND RELATIVELY HIGH BASES WILL LEAD TO DAMAGING WIND POTENTIAL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25020.

...HALES

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