Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 170834
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
234 AM MDT Tue Apr 17 2018

.SHORT TERM...(Today and tonight)
Issued at 232 AM MDT Tue Apr 17 2018

A cold front is pushing through the area this morning shifting
wind flow to the northwest. 700mb temps look to be cold enough to
keep most precip snow but some areas will see a rain/snow mix.
this system is quick moving and should not create much in the way
of accumulation. However, the Cody Foothills could be an exception
with upslope winds around the Meeteetse Rim bringing slightly
higher amounts and winds creating low visibilities. The system
will exit the area around noon and leave a few lingering showers
which should slowly tapper off around midnight. Wednesday will see
the return of ridging and dry weather with a warming trend.
Thursday will be much the same except a cut-off low to the south
will bring increased winds from Sublet to Sweetwater Counties and
very isolated showers late in the evening to the southern areas.

.LONG TERM...(Wednesday through Monday)
Issued at 232 AM MDT Tue Apr 17 2018

An upper low is expected to push east across the Four Corners
region Friday, then into the southern High Plains Saturday. The
forecast area is on the northern fringe of this system, with most
of the precipitation remaining southeast of the forecast area.

A warming trend with mainly dry conditions is expected over the
weekend. Cannot rule out an isolated mountain shower over the
north. Temperatures look to be 5 to 10 degrees above average.

Both the ECMWF and GFS are showing a weak wave pulling across the
northern Rockies Monday and/or Tuesday which could give the area
some valley rain/high mountain snow.

&&

.AVIATION...(For the 06Z TAFS through 06Z Tuesday night)
Issued at 232 AM MDT Tue Apr 17 2018

West of the Continental Divide...KJAC, KBPI, KPNA, and KRKS

Snow showers will occur overnight through 15Z before becoming more
scattered in nature. MVFR to IFR conditions will occur at times.
At KRKS airport snow showers will be most likely between 12Z and
18Z. Expect frequent mountain obscuration A gusty wind will be
common at the terminal sites through 01Z. Then the wind will
decrease after 01Z Wed. VFR conditions  will prevail after 00Z at
the terminal sites.

East of the Continental Divide...KCPR, KCOD, KRIW, KLND, and KWRL

A cold front passes through the area morning. An area of snow will
develop over central WY after 12Z and last until 19Z. This area of
snow will impact the KBYG to KCPR area after 18Z through 00Z.
Lingering snow showers will occur until 03Z Wed. MVFR to IFR
conditions will occur during the snow showers, before returning to
VFR conditions once the area  of snow moves out. Mountains will
be frequently obscured at times. VFR conditions will prevail at
the terminals after 02Z Wed.

&&

.FIRE WEATHER...
Issued AT 232 AM MDT Tue Apr 17 2018

A cold front is pushing though the area this morning which will
bring cooler temperatures and higher RH. South winds will shift to
the west today with wind speeds as high as 30 to 40 mph along with
gusts to 50 mph in zone 279. Accumulating snowfall is likely
across much of Western and Central Wyoming today through this
afternoon. Wednesday will see the return of dryer weather with a
warming trend through Thursday.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory until noon MDT today for WYZ003.

&&

$$

SHORT TERM...Hulme
LONG TERM...Murrell
AVIATION...Ross
FIRE WEATHER...Hulme


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