Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 110547
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
1047 PM MST Sat Dec 10 2016

.Short Term...Tonight Through Sunday (Issued at 328 PM MST)

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.../06Z Issuance/

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

VFR conditions will prevail overnight through Sunday evening.
Local MVFR conditions due to lower ceilings will occur until
12Z. Otherwise, a gusty southwest wind will occur at KCPR
from 19Z Sunday through 06Z Monday.

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

Snow in southern WY will end toward 12Z. Expect MVFR/IFR conditions.
Then VFR conditions will occur southern WY by 14Z. KRKS airport
will have a gusty wind Sunday into Sunday night. Otherwise,
scattered light snow will continue in the western WY mountains
through Sunday night. The KJAC terminal site will see snow at
times through Sunday night. MVFR conditions will prevail after
20Z at the airport.

.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...AR
FIRE WEATHER...C.Baker



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