Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 282049
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
149 PM MST Mon Nov 28 2016

.SHORT TERM...(This evening through Tuesday night)
Issued at 149 PM MST Mon Nov 28 2016

Main problems here will be with winds especially over the plains
on Tuesday.

Snow has pretty much diminished across se Wy today with snow
confined over and close to the higher mtns. Still some blowing
snow evident on webcams around the Snowy Range foothill areas but
latest reports indicate much of the snow has blown out of the area
and I-80 is open. Expect snow showers to continue over the Snowy
and Sierra Madre Ranges this evening before tapering off. Will
keep current hilites in place though they may be able to be
dropped later this evening.

A large upper low currently over eastern North Dakota will move
little through Tuesday then begin drifting east Tuesday night.
A belt of strong mid-level winds will develop over the northern
high plains overnight with 700H wind speeds of 50 to 55kts across
eastern WY and the western Panhandle by morning. These stronger
winds then translate southward during the day Tuesday. Direction
not really favorable for high winds across se Wy but looks like a
solid wind advy for the Panhandle where pattern is more favorable.
Not out of the question for high wind criteria to be approached
especially near the WY/Neb border so will need to watch closely.
Otherwise isolated snow showers should continue over the CWA
Tuesday before ending Tuesday night. Again most of the snow should
fall over the mtns but amounts not looking too high. Cool and
breezy Tuesday night.

.LONG TERM...(Wednesday through Sunday)
Issued at 149 PM MST Mon Nov 28 2016

An active weather pattern will continue late in the week and through
the weekend with a mix of snow, wind, and cold temps. The long
wave trough will begin to exit to the east on Wednesday, with a
vigorous vort max moving southeast on its western fringe Thursday.
Ahead of this wave, shortwave ridging will move overhead on
Wednesday bringing breezy/windy conditions for much of the
forecast area. Then snow will develop over the mountains Wednesday
night, spreading east through Thursday as the upper wave and
attendant cold front drop southeast across the forecast area. Snow
accumulations look light, with not much more than a light dusting
lower elevations, and a few inches of accumulation in the Snowy
and Sierra madres. Temperatures will remain quite cold through
this time within the long wave trough, with overnight lows in the
single digits/teens Thurs/Fri/Sat mornings. High pressure will
build over the eastern Pacific and along the CA/OR/WA coast
through the early part of the weekend. Sfc high pressure building
over the Great Basin in this pattern should strengthen the sfc
pressure gradient across Wyoming, leading to windy conditions in
the wind prone areas Friday night/Saturday morning. Will start to
see a steady warmup as well this weekend, although values will
only return to near normal readings for this time of year.

&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon)
Issued at 1125 AM MST Mon Nov 28 2016

Northwest winds will remain quite gusty at all terminals through
the period. 25 to 35 kts will be common, with perhaps weaker
winds tonight in the high valleys west of the Laramie Range. Snow
showers with brief MVFR conditions may affect locations across
Carbon County this afternoon. These snow showers should spread
east across the plains tonight through Tuesday morning.

&&

.FIRE WEATHER...
Issued at 149 PM MST Mon Nov 28 2016

No fire weather concerns seen for the rest of the week with cool
temperatures continuing to keep min RHs up. There will be some
rather strong and gusty winds through Tuesday over many areas...
especially the Nebraska Panhandle on Tuesday.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...Winter Storm Warning until 5 AM MST Tuesday for WYZ112-114.

     Winter Weather Advisory until 5 PM MST this afternoon for WYZ110-
     111.

NE...Wind Advisory from 10 AM to 5 PM MST Tuesday for NEZ002-003-
     019>021-054-055-095-096.

     Wind Advisory until 3 PM MST this afternoon for NEZ054-055.

&&

$$

SHORT TERM...RE
LONG TERM...RJM
AVIATION...RJM
FIRE WEATHER...RE



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