High Wind in Wyoming, January 4 to 5, 2008

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
614 PM MST FRI JAN 4 2008

.DISCUSSION...WINDS HAVE INCREASED OVER MOST OF THE AREA ALONG AND
WEST OF THE LARAMIE RANGE SINCE SUNSET.  KARL HAS HAD A FEW GUSTS
OVER 60 MPH SINCE THAT TIME.  IN A RECENT FORECAST UPDATE HAVE
MOVED UP THE START OF THE HIGH WIND WARNING TO 01Z.  ALSO ADDED
AREAS OF BLOWING SNOW TO THE FORECAST BASED ON WYDOT REPORTS.

&&

.PREVIOUS DISCUSSION.../ISSUED AT 213 PM MST FRI JAN 4 2008/

SHORT TERM...TONIGHT THRU SUNDAY...MAIN WEATHER TO DEAL WITH TONIGHT
AND SATURDAY WILL BE WIND EVENT EXPECTED TO DEVELOP AS MID LEVEL
WINDS STRENGTHEN AHEAD OF POWERFUL UPPER LOW CURRENTLY MOVING ONTO
THE WEST COAST.  BEST DYNAMICS FOR STRONG WINDS OCCUR SAT MORNING
AND AFTN AS AREA BECOMES SITUATED UNDER RF QUAD OF PPER JET WHILE
SFC LEE TROF DEEPENS OVER ERN WY. TRICK IS DETERMINING HOW FAR EAST
THE STRONG WINDS WILL GET. CURRENT PROGS SHOW BEST DOWNWARD MOTION
OVER AND JUST EAST OF THE LAR RANGE BUT UPWARD MOTION JUST A BIT
FURTHER EAST OVER ERN WY.  RIGHT NOW DO NOT SEE A FAVORABLE SETUP
FOR STRONG WINDS OVER FAR ERN WY DUE TO MITIGATING FACTORS THUS WILL
LOWER THE HIGH WIND WARNING OVER THAT AREA.  WILL MAINTAIN WARNINGS
ELSEWHERE.  SFC COLD FRONT WILL SWEEP ACROSS THE CWA SATURDAY AFTN
WITH A PSUEDO-BORA WIND FOR A BRIEF TIME THEN WINDS WILL DIMINISH IN
THE EVENING.  OTHER THING IS CURRENT WINTER STORM WATCH FOR THE SRN
MTNS FOR SAT AFTN AND EVENING.  SEE NO REASON TO CHANGE THIS NOW AS
BEST PCPN STILL LOOKS TO BE ON TRACK FOR THAT AREA.  SOME CONCERN AS
TO HOW LONG IT WILL LAST AS DRIER AIR QUICKLY MOVES INTO THAT AREA
SATURDAY EVENING. WILL LET LATER SHIFTS PERUSE NEW DATA TO MAKE A
BETTER DETERMINATION OF BEST COURSE OF ACTION.  SATURDAY NIGHT AND
SUNDAY LOOKING MAINLY DRY BEHIND FRONT AND INITIAL UPPER TROF THO
SOME SNOW SHOWERS MAY PERSIST OVER THE SRN MTNS IN MODESTLY MOIST
WSW FLOW.

LONG TERM...SUNDAY NIGHT THROUGH FRIDAY...
AN UPPER TROUGH WILL BEGIN TO MOVE ACROSS THE ROCKIES SUNDAY NIGHT
AND WILL MOVE ACROSS THE CWA MON.  THIS WILL RESULT IN COLDER
TEMPERATURES AND A CHANCE OF SNOW...STARTING IN THE WESTERN PORTION
OF THE CWA SUN NIGHT AND SPREADING EAST ACROSS THE REST OF THE AREA
BY MON MORNING.  WEST TO NORTHWEST FLOW WILL BE ALOFT TUES AS THE
UPPER TROUGH MOVES TO THE EAST.  DOWNSLOPE WINDS WILL RESULT IN DRY
CONDITIONS ACROSS THE FORECAST AREA WITH THE EXCEPTION OF THE
SOUTHERN MOUNTAINS...WHERE A CHANCE OF SNOW WILL CONTINUE.  ANOTHER
UPPER TROUGH WILL MOVE ACROSS THE AREA ON WED...BUT DOWNSLOPE WINDS
EAST OF THE MOUNTAINS WILL LIMIT CHANCE OF SNOW TO AREAS WEST OF THE
LARAMIE RANGE.  DRY CONDITIONS PREVAIL ONCE AGAIN ON THURS AS AN
UPPER RIDGE DEVELOPS OVER THE PAC NW AND NW FLOW OCCURS ALOFT OVER
THE CWA.  FLOW ALOFT BECOMES NORTHERLY AND CYCLONIC ON FRIDAY WHICH
WILL RESULT IN A CHANCE OF SNOW ACROSS THE AREA.  HIGH TEMPERATURES
WILL BE AROUND NORMAL MONDAY...AROUND 5 DEGREES BELOW NORMAL FOR
TUESDAY...AND AROUND NORMAL FOR WEDNESDAY THROUGH FRIDAY.

&&

.AVIATION...MAINLY VFR CONDITIONS EXPECTED OVER MOST OF THE CWA THRU
SATURDAY EXCEPT FOR WRN SECTIONS WHERE MVFR/LOCAL IFR CONDS SHOULD
DEVELOP TONIGHT AS UPPER SYSTEM AND SFC COLD FRONT APPROACHES.
OTHERWISE STRONG WINDS SPREADING OVER AND CLOSE TO THE MTNS TONIGHT
AND CONTINUING THROUGH SAT AFTN AS MID LEVEL WIND FIELD STRENGTHENS.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...HI WIND WRNG FROM 6 PM FRIDAY TO 5 PM SAT FOR WYZ059-WYZ061-
     WYZ062-WYZ064-WYZ066-WYZ067.
     HI WIND WRNG FROM 2 AM SAT TO 5 PM SAT FOR WYZ065.
     HI WIND WRNG 11 AM TO 5 PM SAT FOR WYZ069.
     WS WATCH 11 AM TO 11 PM SAT FOR WYZ063.
NE...NONE.

&&

WEILAND

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
403 AM MST FRI JAN 4 2008

NEZ001>003-019>021-054-055-WYZ059>070-051115-
SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-
CHEYENNE-CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON-
SNOWY RANGE-NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE-
PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS-
403 AM MST FRI JAN 4 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA
PANHANDLE AND SOUTHEAST WYOMING.

.DAY ONE...TODAY AND TONIGHT

HIGH WIND WARNINGS ARE IN EFFECT TONIGHT ACROSS PORTIONS OF SOUTH-
CENTRAL AND SOUTHEAST WYOMING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

HIGH WIND WARNINGS WILL CONTINUE THROUGH SATURDAY AFTERNOON ACROSS
SOUTHEAST WYOMING. A WINTER STORM WATCH IS ALSO IN EFFECT FOR THE
SNOWY AND SIERRA MADRE RANGES FROM MIDDAY SATURDAY THROUGH
SATURDAY NIGHT.

A STRONG SURFACE LOW IS EXPECTED TO FORM OVER EASTERN COLORADO
SUNDAY NIGHT WITH POTENTIAL FOR PRECIPITATION INCREASING ACROSS
SOUTHEAST WYOMING MONDAY AFTERNOON.

VERY STRONG WINDS WILL BE OVER THE AREA TUESDAY AND TUESDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT VERY STRONG WINDS TONIGHT AND
SATURDAY...AND SPOTTERS IN THE HIGHER TERRAIN OF THE SNOWY AND
SIERRA MADRE RANGES ARE ENCOURAGED TO REPORT DANGEROUS WINTER
CONDITIONS SATURDAY AFTERNOON THROUGH EARLY SUNDAY.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE