522
FXUS65 KBYZ 300853
AFDBYZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
153 AM MST SUN NOV 30 2025
KEY MESSAGES
- COLDER THAN NORMAL TEMPERATURES THROUGH MONDAY MORNING; HIGHS IN
THE TEENS AND 20S TODAY.
- INCREASED WINDS ALONG THE WESTERN FOOTHILLS MONDAY NIGHT AND
TUESDAY; LOCALIZED BLOWING SNOW POSSIBLE.
- ANOTHER SYSTEM MAY BRING RAIN AND SNOW SHOWERS, TUESDAY INTO
WEDNESDAY (MODERATE CHANCE) WITH SOME SNOW ACCUMULATIONS.
DISCUSSION
TODAY THROUGH SATURDAY...
AN UPPER TROUGH IS DROPPING THROUGH IDAHO THIS MORNING, BRINGING
A SLIGHT INCREASE IN CLOUD COVER OVER THE WESTERN MOUNTAINS AND
FOOTHILLS. THERE IS A LOW CHANCE (AROUND 15%) FOR LIGHT SNOW
SHOWERS OVER THE SOUTHWEST MOUNTAINS THIS MORNING BEFORE DRY
CONDITIONS ARE FORECAST ACROSS THE AREA THROUGH MONDAY.
THE MAIN MESSAGE FOR THE REST OF TODAY AND INTO MONDAY MORNING IS
A SURFACE HIGH BRINGING COLD TEMPS. SEVERAL LOCATIONS HAVE DROP
INTO THE SINGLE DIGITS TO 10F BELOW ZERO THIS MORNING, WITH
APPARENT TEMPERATURES IN THE TEENS TO 20S BELOW ZERO AS WELL. THIS
IS SOMETHING THAT WILL BE MONITORED THROUGH THE MORNING. HIGH
TEMPERATURES WILL BE IN THE TEENS AND 20S TODAY, WITH THE COLDEST
TEMPS IN THE EAST AS WELL AS AROUND YELLOWSTONE COUNTY WHERE
GREATER SNOWFALL OCCURRED FRIDAY AND SATURDAY.
IN ADDITION TO THE COLD, PATCHY TO AREAS OF FOG AND LOW CLOUDS
ARE FORECAST THIS MORNING IN THE EAST. AS OF 1:30AM, FOG HAS
DEVELOPED AROUND BILLINGS AND MILES CITY AIRPORTS. EXPECT FOG AND
LOW CLOUDS TO DIMINISH BY LATE MORNING.
MODELS CONTINUE TO SHOW INCREASING HEIGHTS ON MONDAY, WITH A
KLONDIKE CHINOOK BRINGING A PERIOD OF GUSTY WINDS IN THE WESTERN
MOUNTAINS AND FOOTHILLS. THE PROBABILITY FOR GUSTS EXCEEDING 50
MPH AROUND LIVINGSTON AND NYE MONDAY INTO TUESDAY, IS 60 TO 70%.
THERE IS SOME CONCERN ON BLOWING SNOW POTENTIAL ACROSS THE WESTERN
FOOTHILLS DURING THIS TIMEFRAME. THE CURRENT FORECAST SHOWS HIGHS
IN THE 20S TO UPPER 30S (WARMER IN THE WEST), IF THIS IS THE CASE
THEN THE THREAT OF BLOWING SNOW WOULD BE LIMITED.
ENSEMBLES CONTINUE TO DEPICT AN UPPER TROUGH DROPPING INTO THE
NORTHERN ROCKIES ON TUESDAY, WITH ENERGY SPLITTING NORTH AND
SOUTH. THE NORTHERN ENERGY LOOKS TO DROP THROUGH THE AREA, WHILE
THE SOUTHERN ENERGY DIVES INTO THE GREAT BASIN. AS IT STANDS,
THERE IS A MODERATE TO HIGH CHANCE (40-80% CHANCE) FOR RAIN/SNOW
SHOWERS TO MOVE THROUGH THE AREA STARTING TUESDAY AFTERNOON,
CONTINUING INTO WEDNESDAY. WHILE PRECIPITATION COULD BE A
RAIN/SNOW MIX FOR THE LOWER ELEVATIONS, ACCUMULATING SNOW IS
POSSIBLE FOR THE FOOTHILLS AND MOUNTAINS. THE PROBABILITY FOR 2 OR
MORE INCHES OF SNOW IS ROUGHLY 20-50% FOR AREAS ALONG AND SOUTH
OF I-90. AN UNSETTLED PATTERN WILL CAUSE TEMPERATURES TO SWING
BACK AND FORTH FROM THE 30S AND 40S, TO THE 20S AND 30S AT TIMES
THROUGH THE REMAINDER OF THE WEEK WITH PRECIPITATION CHANCES AND
PERIODS OF WIND ALONG THE WESTERN FOOTHILLS. STP/PM
AVIATION
FOG IS FORECAST OVER PORTIONS SOUTH-CENTRAL AND EASTERN MONTANA,
AND NORTHERN WYOMING, THIS MORNING. WHILE IMPACTS TO TAF SITES
REMAIN UNCERTAIN, KMLS AND KBIL HAVE ALREADY SEEN SOME IMPACTS
FROM PATCHY FOG. ANY FOG THAT DEVELOPS THIS MORNING SHOULD LIFT
AFTER SUNRISE. ALONG WITH THE FOG, AN AREA OF LOW STRATUS OVER
EASTERN MONTANA IS EXPECTED TO PERSIST THROUGH THE EARLY MORNING
HOURS TODAY. WITH THIS, MVFR CEILINGS AS LOW AS 1,000 FEET HAVE
BEEN OBSERVED AT KBHK. OUTSIDE OF THIS, VFR CONDITIONS WILL
PREVAIL TODAY. OVER THE ABSAROKA- BEARTOOTH MOUNTAINS, THERE IS A
SLIGHT CHANCE OF LIGHT SNOW THIS MORNING, BUT IMPACTS LOOK TO
REMAIN LITTLE TO NONE. ARENDS
PRELIMINARY POINT TEMP/POPS
TDY MON TUE WED THU FRI SAT
-------------------------------------------------------
BIL 019 008/032 024/037 015/026 016/036 025/039 026/039
0/B 00/B 15/W 51/B 01/B 22/W 34/W
LVM 027 011/036 026/037 017/033 018/039 025/041 029/042
0/B 00/B 26/J 40/B 01/B 33/W 45/W
HDN 019 002/033 018/037 013/025 009/036 020/039 022/037
0/B 00/U 17/W 72/J 02/J 34/W 45/W
MLS 018 004/028 017/035 009/019 008/035 023/036 021/032
0/U 00/U 03/W 40/E 01/B 32/W 44/W
4BQ 022 009/032 019/037 014/021 011/036 023/037 023/036
0/B 00/U 03/J 60/E 00/B 22/W 33/W
BHK 016 000/025 012/034 003/016 003/034 020/036 015/029
0/B 00/U 02/J 40/E 00/B 32/J 43/J
SHR 025 005/037 017/038 014/027 009/039 019/041 022/040
0/B 00/U 05/J 82/J 01/B 33/W 34/W
BYZ WATCHES/WARNINGS/ADVISORIES
MT...NONE.
WY...NONE.
WEATHER.GOV/BILLINGS
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