FXUS65 KRIW 271140

AFDRIW



Area Forecast Discussion

National Weather Service Riverton WY

540 AM MDT Mon Oct 27 2025



.KEY MESSAGES...



- Valley rain and mountain snow will continue across the region

  today, with snow accumulations continuing above 8000 feet.

  Winter conditions will continue for most mountain passes

  through the day.



- Gusty northwest winds return today, with widespread gusts

  above 30 mph expected.



- Cold temperatures continue Tuesday before moderating through

  the rest of the week.



&&



.DISCUSSION...

Issued at 221 AM MDT Mon Oct 27 2025



The broad trough continues to sweep across the northern Rockies

this morning. This is keeping the moisture feed off the Pacific

well placed for lift along local mountain ranges. Models

continue to show elevated lift aloft through the rest of the

day, which will continue to aid in snow production. Peak times

for the northwest mountains should be between now and around

noon, with the focus shifting briefly east to the Bighorns this

afternoon. Additional snowfall accumulations of 3 to 6 inches is

expected before the system moves out tonight. Current warnings

and advisories mesh well with the current timings, so will not

need any adjustments here. As the system moves east this 

evening, a brief period of rain/snow mix will develop for 

Natrona and Johnson Counties, with snow accumulations up to a 

half inch possible.



Winds will also come up across the state today, as the northwest

flow aloft mixes down to the sfc. Widespread wind gusts above 

30 mph are expected, except for the more shaded places across NW

WY. The southern half of the state will see even higher gusts

this afternoon, with frequent gusts 40 to 50 mph likely (>60%).



High pressure builds in for Tuesday, with much colder

temperatures. Highs will struggle to reach 40 degrees, before

falling into the teens and low 20s Tuesday night. H5 ridging

builds across the Rockies midweek, deflecting the next system

into Montana. Right now it would only provide some high clouds

during the day. Models differ on the next system which may pass

through Friday night, with a wide range of strength and moisture

available. Current trend is for a drier passage, with milder

temperatures in the 50s and 60s remaining through the weekend.



&&



.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/...

Issued at 524 AM MDT Mon Oct 27 2025



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



Light snow continues to fall around KJAC this morning, but

breaks are starting to be noted on satellite. Conditions should

be improving through the morning, but snow will likely continue

to hold down visibility through 18Z. A few showers are also

still possible at KBPI/KPNA, but clouds are already decreasing

quickly, so no predominant precip at those sites. Main issue at

KRKS will be very gusty winds returning later this morning, with

frequent gusts around 40kts this afternoon.



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



Main issue will be gusty northwest winds picking up quickly this

morning. All sites will be gusting to at least 25kts, with

KLND/KRIW/KCPR gusting to 35kts. Some light rain is possible

this morning at KCOD, but chances are fairly low. Precip shifts

east toward KCPR this afternoon, with chances for rain through

early evening. Some brief switchover to snow is possible between

00Z and 06Z, but impacts remain low.



&&



.RIW WATCHES/WARNINGS/ADVISORIES...

Winter Storm Warning until 6 PM MDT this evening for WYZ001-

012.



Winter Weather Advisory until noon MDT today for WYZ002-014-

015-024.



Winter Weather Advisory until 6 PM MDT this evening for WYZ008.



&&



$$



DISCUSSION...Straub

AVIATION...Straub