Wednesday, June 18, 2008

WATCHES: Severe Thunderstorm Watch Number 573

WWUS20 KWNS 190000
SEL3
SPC WW 190000
WYZ000-190600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 573
NWS STORM PREDICTION CENTER NORMAN OK
605 PM MDT WED JUN 18 2008

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

EASTERN WYOMING

EFFECTIVE THIS WEDNESDAY NIGHT FROM 605 PM UNTIL MIDNIGHT 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 50 MILES NORTH
NORTHEAST OF GILLETTE WYOMING TO 50 MILES SOUTH SOUTHEAST OF
DOUGLAS WYOMING. 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 568...WW 569...WW
570...WW 571...WW 572...

DISCUSSION...THUNDERSTORMS ARE INCREASING IN COVERAGE AND INTENSITY
OVER THE MOUNTAINS OF NORTHEAST WY IS REGION OF UPSLOPE LOW LEVEL
FLOW AND MODEST INSTABILITY. IT APPEARS LIKELY THAT STORMS WILL
PERSIST THROUGH MUCH OF THE EVENING AND TRACK SOUTHEASTWARD TOWARD
THE NEB/SD BORDER.

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 450. MEAN STORM
MOTION VECTOR 30030.


...HART

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