Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 102228
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
328 PM MST Sat Dec 10 2016

.Short Term...Tonight Through Sunday

Moist zonal flow across the west into western Wyoming will bring
periods of snow to the west and south tonight and Sunday. Snowfall
rates are expected to decrease and the Winter Storm Warning has
been cancelled. While some strong winds will blow through the
night the areal coverage is expected to decrease with the high
wind warning has been cancelled. Temperatures will continue to be
very tricky with the windy areas warming significantly and the
calm areas remaining trapped with colder temperatures.

.Long Term...Sunday Night Through Saturday

Areas of light snow will continue in the west with much less
accumulation as moisture and lift decrease in the west flow aloft.
Snowfall may increase on Tuesday and Wednesday with a better
chance of heavy snow Wednesday night through Friday. the extended
models continue to show an outbreak of arctic air moving south
across the area Friday and Saturday with low single digit highs
and lows to -25 to -30 possible Saturday morning.

.Aviation.../00Z Issuance/

EAST OF THE DIVIDE...KCOD/KCPR/KLND/KRIW/KWRL ROUTES

VFR conditions are expected through 03Z. A gusty southwest
wind will occur at KCPR and this will continue into this
evening. Isolated snow showers will occur in the north today.
A cold front pushes into northern WY after 00Z with a wind
shift to the north or northwest. This wind shift will reach
central WY by midnight tonight. Scattered light snow
will develop over the north this evening with local MVFR
conditions and this snow may move into central WY after 07Z
Sunday. All stations should return to VFR conditions by 17Z
Sunday.

WEST OF THE DIVIDE...KBPI/KJAC/KPNA/KRKS ROUTES

Snow will occur in the west through 01Z. MVFR to IFR
conditions will prevail with local LIFR conditions. Gradual
improvement will occur in the west through after 02Z as the
snow decreases and ceilings and visibilities rise. KRKS will
remain VFR until about 00Z, then MVFR to IFR conditions
will develop there as snow moves into that terminal site.
The snow is expected to linger through 12Z Sunday in southern
WY including the KRKS airport. VFR conditions should prevail after
12Z Sunday in most although low VFR in some areas. There will still
be occasional mountain obscurations and spotty MVFR conditions may
occur near KJAC with higher elevation flurries and snow showers.

.Fire Weather...

Moist zonal flow across the west into western Wyoming will bring
periods of snow to the west and south tonight and Sunday. Snowfall
rates are expected to decrease and the Winter Storm Warning is
still scheduled to end at 6 pm mst this evening. While some strong
winds will blow through the night the areal coverage is expected
to decrease with the high wind warning expiring at 6 pm mst also.
Temperatures will continue to be very tricky with the windy areas
warming significantly and the calm areas remaining trapped with
colder temperatures. low mixing heights will result in poor smoke
dispersal most areas.  The windier areas may mix out the have low
end good smoke dispersal Sunday afternoon.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

SHORT TERM...C.Baker
LONG TERM...C.Baker
AVIATION...Hattings
FIRE WEATHER...C.Baker


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