Area Forecast Discussion
Issued by NWS Riverton, WY

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970
FXUS65 KRIW 241800
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
1100 AM MST Fri Feb 24 2017

.UPDATE...

The Winter Storm Warnings and Advisories will be allowed to expire
today at 11am this morning as the low pressure system that brought
significant snowfall and strong winds to the region continues to
dissipate and move into northern Colorado.

&&

.PREV DISCUSSION... /issued 1033 AM MST Fri Feb 24 2017/

SHORT TERM...Today through Sunday night

Pattern begins to settle down today, as the main storm system
continues its trek over the Great Lakes. Most of the major impacts
from Thursday have diminished this morning. Apart from a few
locations, winds have subsided across the area. Light snow continues
over the area as well, as cloud tops warm. Will keep warnings
going this morning and let the day shift decide whether to cancel
early or not, after assessing any impacts for the morning commute.
The forecast challenge today and Saturday will be with 1 or 2
leftover upper level lows, that could produce light amounts of
snow. The best chances for snow will occur over the northern and
western mountains, as a remnant circulation over NE ID continues
to weaken and fill as it meanders toward SW MT. A weak and dry
Canadian cold front will merge/wash out, as it sweeps across
Wyoming Saturday night. A ridge will then build over the area
Sunday, as another storm system dives southward along the West
Coast.

LONG TERM...Monday through Friday

Unsettled weather Monday and Tuesday with periods of snow in the
west. Scattered light snow is possible east of the divide. Temps
remaining on the cold side both days. Northwest flow aloft for
Wednesday through Friday. Some moisture in this northwest flow
will bring some light snow at times in the northwest mountains and
the northern Bighorn mountains. The rest of the region will be
dry. A cold front may brush the north and northeast zones
Wednesday night. The cooling will not be that much, as warmer air
comes back quick on Thursday afternoon to those areas. Temps will
be a little milder Thurs and Fri for most places. Low temps will
be tricky due to the new snowfall in parts of the region. Plus
breezy to windy areas Wed and Fri will also impact low temps,
keeping them milder than the valleys that do not see any mixing.

AVIATION.../18Z ISSUANCE/

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

Borderline MFVR ceilings and some vicinity light snow will be
possible at the very beginning of the forecast period early this
afternoon at several of the TAF sites. Conditions will improve
this afternoon with scattered snow showers mainly confined to the
mountains, VFR conditions becoming prevalent across the valleys.
Clearing will continue tonight with a few snow showers mainly
confined to the extreme northwest corner of Wyoming 6z-12z
Saturday. Expect VFR conditions and lighter winds for the area
after 12z Saturday through the end of the forecast period.

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

The main area of upper level low pressure system will continue to
move east across the Central Plains tonight and Friday morning.
Widespread MVFR/IFR conditions will remain across the area with
areas of light snow, but winds will continue to diminish through
this morning.  Low level upslope easterly flow will shift westerly
Friday afternoon with snow ending, ceilings lifting and dissipating,
VFR conditions prevailing mid to late Friday afternoon.  Clouds will
continue to lift and scatter out Friday night. Southwest winds will
increase to 15-25 knots vicinity KCPR-50 SM NE KRKS 6z-12z Saturday.

FIRE WEATHER...

Light snow will linger through the day today, before ending across
much of the area tonight. Light snow will be confined to the
northern and western mountains through the weekend. Gusty west winds
will return across southern and southwestern portions today, but
will subside this evening. Temperatures will be below normal for the
next few days. Expect inversions, especially in the central basins,
over the weekend as skies clear and winds become light.

&&

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

&&

$$

SHORT TERM...LaVoie
LONG TERM...AR
AVIATION...Team Riverton
FIRE WEATHER...LaVoie



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