Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 032335
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
535 PM MDT Fri Apr 3 2020

.SHORT TERM...This evening through Saturday night
Issued at 216 PM MDT Fri Apr 3 2020

Clear skies and calm winds will continue across much of the forecast
area this afternoon. Mostly cloudy to overcast skies continue to
hang over northwestern portions. Light snow showers will be possible
in this area through tonight, becoming isolated late tonight into
Saturday. The main trough axis of the longwave trough has shifted
east over the Plains. This trough will continue to fill tonight,
with a shortwave ridge building over the region through the day
Saturday. Progressively higher sun angle will assist in melting the
widespread fresh snow pack today, pushing temps back into the 30s
and 40s this afternoon. With midlevel temps tonight a good 5 to 7
degrees Celsius above current levels, lows tonight should only fall
into the teens and lower 20s for most areas, with some single digits
possible for cold-prone locations and higher elevations. The
shortwave ridge will bring warmer temps into the region for
Saturday, with highs returning closer to near normal in the 40s and
50s for lower elevations, and into the lower 30s for higher
elevations. Pacific moisture will return to far western portions
Saturday night, as another storm system digs southward along the
West Coast. A few inches of new snow will be possible with this
activity and likely continue into Sunday. More on this in the next
section.

.LONG TERM...Sunday through Friday
Issued at 216 PM MDT Fri Apr 3 2020

A series of minor shortwaves will move through the trough Sunday
morning, Monday and then again on Tuesday morning bringing more
bouts of rain and snow to western Wyoming. The temperatures will
rebound across the state in the continued southwest flow. Monday and
Tuesday, the main low will become cutoff and track southward along
the CA coast with a trough splitting off to the north and tracking
into Canada and skimming northern Wyoming. Most of the precipitation
impact with this system will be in western Wyoming through Tuesday.
There will be strong winds for the mountains and areas east of the
Divide on Monday as the southwest flow strengthens a bit.

Wednesday and Thursday look to be fairly quiet weather wise, with
temperatures showing a nice warmup through the week. Thursday looks
to be a bit gusty along the southern wind corridor and across the
mountain ranges. Models continue to eject the cutoff low from CA on
Thursday, but each run continue to track further south. As of right
now impacts look minimal.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday)
Issued at 515 PM MDT Fri Apr 3 2020

East of the Divide...KCOD/KCPR/KLND/KRIW/KWRL Terminals

VFR conditions will occur at the terminal sites. Expect breezy
conditions out of the southwest at KCPR through 02Z this evening.
There is an outside chance for some patchy fog Saturday morning at
KLND and KRIW, but confidence is low so we kept it VCFG.

West of the Divide...KBPI/KJAC/KPNA/KRKS Terminals

VFR conditions will prevail at the terminal sites. Isolated snow
showers will occur in the western mountains through 02Z, but will be
very light and isolated. Local MVFR conditions will occur with
partial mountain obscuration. Breezy southwest winds return to KRKS
Saturday afternoon.

Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for
the latest information on icing and turbulence forecasts.

&&

.FIRE WEATHER...
Issued AT 216 PM MDT Fri Apr 3 2020

Clear skies, light winds and mainly dry conditions will be in
place across the area this afternoon, as Thursday`s snow quickly
melts. Snow showers will occur this afternoon and tonight over
northwestern portions. Temperatures will slowly recover the next
couple days, returning to near normal in the 40s and 50s by
Sunday. Despite the melting snow, humidity levels be below 30
percent east of the Divide and zone 279. A new round of
precipitation will impact far western portions Saturday night into
Sunday.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

$$

SHORT TERM...LaVoie
LONG TERM...Hulme
AVIATION...Hulme
FIRE WEATHER...LaVoie



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