High Wind Warning 14, NWS Cheyenne, WY

575 
WWUS75 KCYS 101159
NPWCYS

URGENT - WEATHER MESSAGE
National Weather Service Cheyenne WY
459 AM MST Mon Feb 10 2020

WYZ110-101300-
/O.CAN.KCYS.HW.W.0014.000000T0000Z-200210T1300Z/
North Snowy Range Foothills-
Including the cities of Arlington and Elk Mountain
459 AM MST Mon Feb 10 2020

...HIGH WIND WARNING IS CANCELLED...

Locally strong winds between Arlington and Elk Mountain have
diminished this morning. Therefore, the High Wind Warning has been
cancelled. South to southwest winds may occasionally gust as high
as 50 mph for the rest of today. 

$$

Area Forecast Discussion
National Weather Service Cheyenne WY
1029 PM MST Sun Feb 9 2020

.UPDATE...
Issued at 949 PM MST Sun Feb 9 2020

Looking at latest WYDOT webcams and night time satellite
imagery...looks like the fog over the Summit has moved south into
northern Colorado. Went ahead and cancelled the fog advisory early
as impacts on the Summit have ceased. Updates have been sent.

UPDATE Issued at 704 PM MST Sun Feb 9 2020

Latest WYDOT webcams across the Summit and Vedauwoo showing areas
of dense freezing fog along with visibility measurements of under
a quarter mile. Went ahead with a freezing fog advisory till 1 AM
for the WYZ116.

&&

.SHORT TERM...(This evening through Monday night)
Issued at 245 PM MST Sun Feb 9 2020

Early afternoon WV/IR imagery revealed a split flow pattern aloft,
with a southern stream cutoff low over central CA and progressive
northern stream trough from the Upper Midwest to the central Rocky
Mountain region. Surface cold front extended from central IA through
southeast KS, central OK to eastern NM. Pacific moisture was streaming
northeast across the Four Corners region. Weak isentropic lift was
producing light snow showers along the I-80 corridor from west of
Laramie east through Cheyenne and Kimball. The precipitation will
gradually taper off through late afternoon and early evening. Despite
the occasional high cloudiness, overnight lows will plummet into the
single digits and lower teens, with sub-zero readings for the valleys
west of the Laramie Range.

Next Alberta clipper and associated cold front is forecast to quickly
move to the southeast across MT, WY and the Dakotas Monday. Snow
showers will develop over north-central WY by Monday morning, spread
into southeast WY Monday afternoon, and taper off Monday evening.
Accumulations will vary from less than an inch lower elevations, to
two inches over the mountains. High temperatures Monday will be a
few degrees milder for the high plains compared to Sunday. Gusty
northwest winds will develop in the wake of the frontal passage.
Expect even colder low temperatures Monday night as skies clear and
winds diminish, ranging from the single digits above zero east of I-25
and single digits below zero west of I-25.

.LONG TERM...(Tuesday through Sunday)
Issued at 245 PM MST Sun Feb 9 2020

Split flow transitions to a progressive high-amplitude pattern by
Wednesday, with a couple of trough and ridge passages into next weekend.
Northwest flow aloft will prevail through Thursday between a upper
ridge to the west and upper trough to the east. This will allow another
Alberta clipper to push southeast into the Northern Plains and Upper
Midwest. Temperatures will continue below normal with highs in the
20s and 30s and overnight lows in the single digits and teens. Westerly
winds will be increasing for wind-prone areas beginning Tuesday
afternoon as 700/850mb CAG-CPR gradients rise above 60mtrs, and remain
elevated through Wednesday morning. 700-800mb winds increase to 40-45kts.
Winds and gradients decrease late Wednesday, but increase once again
Thursday evening into Friday morning. High temperatures will moderate
into the 30s and 40s Friday with the passage of a ridge and southwest
flow aloft ahead of the next Pacific trough moving through the CWA
Saturday. Cooler temperatures Saturday will moderate once again Sunday
as the flow aloft becomes westerly. With regards to precipitation, there
will be chances for snow showers Wednesday, and Friday through Sunday.
The higher elevations can expect some accumulation, with lesser amounts
for lower elevations.

&&

.AVIATION...(For the 06Z TAFS through 06Z Monday night)
Issued at 1027 PM MST Sun Feb 9 2020

VFR conditions expected over next 24 hours with westerly
downsloping winds and dry conditions. Do start to see a chance of
snow showers returning late Monday evening that could drop
ceilings. At this time though...confidence not too high on which
airports will see these conditions. Stand by for later updates as
we closer to the event.

&&

.FIRE WEATHER...
Issued at 230 PM MST Sun Feb 9 2020

Existing snow pack, cold temperatures, non-critical humidities and
chances for more precipitation will preclude fire weather concerns
through most of the week. It will be breezy to windy during the mid-
to-late week period.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.
&&

UPDATE...GCC
SHORT TERM...MAJ
LONG TERM...MAJ
AVIATION...GCC
FIRE WEATHER...MAJ

Hazardous Weather Outlook
National Weather Service Cheyenne WY
1053 AM MST Sun Feb 9 2020

NEZ054-WYZ103>107-109>119-101800-
Kimball-North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
1053 AM MST Sun Feb 9 2020

This hazardous weather outlook is for portions of western
Nebraska...south central Wyoming and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Occasional snow showers will persist into the afternoon hours,
mainly along and south of the Interstate 80 corridor. Additional
accumulations will be less than an inch.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

Winds will increase late Tuesday and early Wednesday for the wind
prone areas of southeast Wyoming.

.Spotter information statement...

Spotter activation will not be required.

NEZ002-003-019>021-055-095-096-WYZ101-102-108-101800-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Cheyenne-North Sioux-
South Sioux-Converse County Lower Elevations-Niobrara County-
Goshen County-
1053 AM MST Sun Feb 9 2020

This hazardous weather outlook is for portions of western
Nebraska...east central Wyoming and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

The probability for widespread hazardous weather is low.

.Spotter information statement...

Spotter activation will not be required.

Special Weather Statement
National Weather Service Cheyenne WY
1134 PM MST Sun Feb 9 2020

WYZ110-100900-
North Snowy Range Foothills-
Including the cities of Arlington and Elk Mountain
1134 PM MST Sun Feb 9 2020

...STRONG WINDS WITH INCREASED BLOWOVER RISK ALONG INTERSTATE 80
NEAR ARLINGTON...

Through 2 AM Monday expect southwest winds of 35 to 40 mph
sustained with gusts approaching 60 mph to occur along Interstate
80 between mile markers 266 and 274. If traveling Interstate 80
late this evening into early Monday morning...be prepared for
sudden wind gusts that could blow your vehicle off the road. Winds
are expected to slowly ease through 2 AM Monday. The Wyoming
Department of Transportation has closed this portion of Interstate
80 to light weight and high profile vehicles until further
notice.