056
FXUS65 KRIW 290920
AFDRIW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
220 AM MST MON DEC 29 2025
KEY MESSAGES
- TEMPERATURES BACK NEAR NORMAL TODAY WITH NEARLY CLEAR SKIES.
- WARMING TEMPERATURES THROUGH THE REST OF THE WEEK WITH HIGHS
IN THE 40S.
- NO PRECIP ACROSS WESTERN AND CENTRAL WY THROUGH THE REST OF
THE WEEK, WITH ONLY LIGHT SNOW POSSIBLE FOR THE WESTERN
MOUNTAINS THIS WEEKEND.
DISCUSSION
ISSUED AT 132 AM MST MON DEC 29 2025
HIGH PRESSURE WILL BE HOLDING CONTROL ALONG THE NORTHERN ROCKIES
DURING THE NEXT SEVERAL DAYS, DEFLECTING THE STORM TRACK BACK
INTO CANADA AND KEEPING MILD TEMPERATURES GOING FOR WYOMING.
LOWS THIS MORNING HAVE BEEN COLD, WITH TEMPS WELL BELOW ZERO FOR
THE WESTERN VALLEYS, AND IN THE SINGLE DIGITS ABOVE ZERO EAST OF
THE DIVIDE. SOUTHWEST FLOW RETURNS TODAY, HELPING TO CARVE OUT
SOME OF THE COLD POOL THAT HAS SETTLED IN THE REGION. WITH THE
COLD POOL NOT OVERLY STRONG AND NOT REINFORCED BY ANY SNOWPACK,
EXPECT A GOOD RECOVERY OF TEMPERATURES INTO THE 30S THIS
AFTERNOON. WESTERN VALLEYS THAT DO HAVE SNOWPACK AND ARE
STARTING A LOWER TEMPERATURES WILL HAVE MORE TROUBLE GETTING
OUT OF THE TEENS THIS AFTERNOON. THIS PATTERN WILL CONTINUE
THROUGH THE REMAINDER OF THE WEEK, AS THE RIDGE HOLDS IN PLACE,
PUSHING SYSTEMS OFF TO THE NORTH AND CONTINUING TO CARVE UP ANY
REMAINING COLD POOL. MOST AREAS WILL BE BACK IN THE 40S BY
WEDNESDAY, WITH JACKSON HOLE AND STAR VALLEY HOLDING BACK A BIT
DEPENDING ON HOW FAST SURFACE SNOW THINS OUT.
THE RIDGE TRIES TO SHIFT MORE EAST LATE IN THE WEEK, OPENING THE
DOOR FOR SOME MOISTURE TO GET BACK INTO THE WESTERN MOUNTAINS,
BUT A LACK OF SIGNIFICANT SUPPORTING STORM SYSTEMS WILL KEEP ANY
SNOWFALL ON THE LIGHTER SIDE FOR THE TIME BEING.
AVIATION /06Z TAFS THROUGH 06Z TUESDAY/
ISSUED AT 930 PM MST SUN DEC 28 2025
VFR CONDITIONS EXPECTED THROUGHOUT THE ENTIRETY OF THE PERIOD.
LIGHT WINDS AND SCATTERED HIGH CLOUDS OVERNIGHT. MID LEVEL
CLOUDS PUSH THROUGH DURING THE LATE MORNING AND AFTERNOON
HOURS. WINDS INCREASE AT RKS UP TO 18KTS AND CPR UP TO 30KTS
DURING PEAK HEATING AND MIXING BETWEEN 16-00Z BEFORE DIMINISHING
TO 10KTS OR LESS WITH RADIATIONAL COOLING AFTER SUNSET. ALL
OTHER SITES REMAIN 10KTS OR LESS THROUGHOUT, LESS DURING NIGHT
TIME HOURS. OTHERWISE, DRY CONDITIONS WITH NO OTHER WEATHER
ELEMENTS EXPECTED.
PLEASE SEE THE AVIATION WEATHER CENTER AND/OR CWSU ZLC AND ZDV FOR
THE LATEST INFORMATION ON ICING AND TURBULENCE FORECASTS.
RIW WATCHES/WARNINGS/ADVISORIES
NONE.
UPDATE...DZIEWALTOWSKI
DISCUSSION...STRAUB
AVIATION...LOWE
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