

000 

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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