239
FXUS65 KBYZ 252029
AFDBYZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
229 PM MDT SAT OCT 25 2025
KEY MESSAGES
- GUSTY WINDS OVER THE MOUNTAINS AND FOOTHILLS WEST OF BILLINGS
TODAY INTO SUNDAY. WIND GUSTS 40 TO 60 MPH, STRONGEST AROUND
LIVINGSTON TO NYE AND IN THE PARADISE VALLEY THIS AFTERNOON AND
EARLY EVENING.
- WEATHER SYSTEM BRINGS COOLER TEMPERATURES, BREEZY CONDITIONS,
AND THE CHANCE OF PRECIPITATION (20-60%) ACROSS THE AREA TONIGHT
INTO MONDAY. BEST PRECIPITATION EXPECTED OVER THE ABSAROKA-
BEARTOOTH MOUNTAINS (6 TO 10 INCHES OF SNOW). 10-50% CHANCE FOR
GREATER THAN 0.25 INCHES OF PRECIPITATION ACROSS THE REGION.
- DRY CONDITIONS WITH SEASONAL TEMPERATURES TUESDAY THROUGH
SATURDAY.
DISCUSSION
TONIGHT THROUGH FRIDAY...
WIND...
A COLD FRONT ASSOCIATED WITH A CLIPPER SYSTEM WILL DECREASE MIX
DOWN WINDS OVER THE FOOTHILLS TONIGHT. WINDS WILL REMAIN ELEVATED
FOR LIVINGSTON OVERNIGHT HOWEVER DUE TO AN INCREASING IDAHO FALLS
TO LEWISTOWN PRESSURE GRADIENT NEAR 10 MB AND FORECAST SOUNDINGS
INDICATING AN INVERSION SETTING UP. WINDS WILL REMAIN BREEZY
OVERNIGHT FOR MOST FOOTHILLS LOCATIONS DUE TO 700 MB WINDS IN THE
40S KTS AND DOWNSLOPING WINDS PREVENTING THE FORMATION OF A LOW
LEVEL INVERSION FOR MANY LOCATIONS. WIND GUSTS IN THE 30S MPH WILL
BE COMMON DURING THE OVERNIGHT.
WINDS ARE EXPECTED TO INCREASE ACROSS THE FORECAST AREA SUNDAY
WITH THE COLD FRONTAL PASSAGE. 700 MB WINDS OF 30-40 KTS AND
FAVORABLE LAPSE RATES WILL LEAD TO WIND GUSTS INTO THE 30S MPH.
WINDS FOR FOOTHILLS LOCATIONS ARE EXPECTED TO BE IN THE 40S MPH.
THE CHANCE FOR A WIND GUST OVER 40 MPH IS 50-90% FOR LOCATIONS
FROM YELLOWSTONE COUNTY AND WEST WITH 10-30% CHANCES EAST OF
YELLOWSTONE COUNTY.
PRECIPITATION...
PRECIPITATION CHANCES (40-60%) INCREASE IN THE WESTERN FOOTHILLS
TONIGHT BEFORE SPREADING OVER THE LOWER ELEVATIONS SUNDAY (20-30%).
THERE IS A CHANCE (10%) FOR A BRIEF PERIOD OF A RAIN/SNOW MIX
OVER THE FOOTHILLS SUNDAY MORNING WITH RAIN BEING THE DOMINANT
PRECIPITATION TYPE OTHERWISE. SUNDAY NIGHT INTO MONDAY, A SECOND
UPPER LEVEL WAVE MOVES THROUGH THE REGION BRINGING ADDITIONAL
PRECIPITATION CHANCES (20-30%). HIGH PRESSURE WILL CONTINUE TO
MOVE INTO THE REGION SUNDAY NIGHT LEADING TO WIDESPREAD LOW
TEMPERATURES IN THE HIGH 20S TO MID 30S ACROSS THE REGION. THIS
WILL LIKELY BRING A CHANGEOVER TO SNOW FOR THE FOOTHILLS AND A
RAIN/SNOW MIX FOR LOWER ELEVATIONS. THE CHANCE FOR GREATER THAN 1
INCH OF SNOW REMAINS BELOW 10% FOR ALL NON-MOUNTAIN LOCATIONS. THE
CHANCE FOR GREATER THAN 0.25 INCHES OF PRECIPITATION TONIGHT
THROUGH MONDAY IS 10-50% WITH THE BEST CHANCES OVER THE MOUNTAINS
AND FOOTHILLS.
TEMPERATURES ARE EXPECTED TO BE IN THE 50S TO LOW 60S F OVER THE
NEXT WEEK. PREDOMINANT ABOVE AVERAGE 500 MB HEIGHTS IS EXPECTED
TO LEAD TO DRY CONDITIONS. TORGERSON
AVIATION
18Z DISCUSSION...
MID AND HIGH LEVEL CLOUDS WITH VFR CONDITIONS WILL CONTINUE FOR
MOST OF THE PERIOD THROUGHOUT THE REGION. GUSTY WESTERLY WINDS
WILL MOVE IN AFTER 00Z FOR ALL SITES WITH GUSTS REACHING 30KTS AT
TIMES. IN THE FOOTHILLS AROUND KLVM GUSTS COULD GET MUCH HIGHER
(UP TO 50KTS) BETWEEN 03-07Z OUT OF THE SOUTHWEST. MOUNTAIN SNOW
WITH FOOTHILL SHOWERS MOVES INTO SOUTH-CENTRAL MT AROUND 03Z. SNOW
SHOWERS MAY BEGIN IN THE BIGHORN MOUNTAINS AT THE VERY END OF THE
PERIOD. MOUNTAINS WILL BE PARTIALLY TO FULLY OBSCURED FOR THE
ENTIRE PERIOD.
KBIL CAN EXPECT TO SEE BREEZY WEST-SOUTHWESTERLY WINDS GUSTING UP
TO 30KTS WITH MINIMAL TO NO PRECIP THROUGH THE PERIOD. WMR
PRELIMINARY POINT TEMP/POPS
SUN MON TUE WED THU FRI SAT
-----------------------------------------------------------
BIL 044/056 034/051 029/050 031/060 034/055 033/058 043/063
13/W 22/W 00/U 01/B 10/B 00/B 11/B
LVM 035/050 028/044 021/048 027/060 031/054 029/057 039/060
64/W 53/J 00/U 01/B 10/B 00/B 11/N
HDN 042/058 032/052 027/051 027/060 031/055 027/058 037/063
13/W 33/W 00/U 01/B 20/B 00/B 11/B
MLS 044/059 032/052 029/050 026/059 034/053 029/056 038/062
12/B 22/W 00/U 01/B 20/B 00/B 11/B
4BQ 046/058 035/049 030/048 027/058 034/052 030/056 037/062
12/W 33/W 00/U 00/B 10/B 00/B 01/B
BHK 042/059 032/050 026/048 022/055 029/052 025/052 031/060
01/N 33/W 10/U 00/B 10/B 00/B 01/B
SHR 039/058 029/047 023/048 022/060 029/053 026/057 033/063
02/W 34/W 10/U 00/B 21/B 00/B 11/B
BYZ WATCHES/WARNINGS/ADVISORIES
MT...WIND ADVISORY IN EFFECT UNTIL 3 AM MDT SUNDAY FOR ZONES
65-66.
WY...NONE.
WEATHER.GOV/BILLINGS
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