799
FXUS65 KGGW 051917
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
117 PM MDT MON OCT 5 2026
KEY MESSAGES
- COOLER TEMPERATURES AND INCREASED CLOUD COVERAGE TOMORROW
THROUGH THURSDAY.
- WARMER TEMPERATURES AND CLEAR SKIES FRIDAY.
- OVERCAST SKIES, POSSIBLE PRECIPITATION, AND MUCH COLDER
TEMPERATURES THIS WEEKEND AND INTO MONDAY.
DISCUSSION
AN UPPER-LEVEL RIDGE OVER THE FOUR CORNERS REGION WILL RESULT IN
FAIR WEATHER THIS AFTERNOON. HOWEVER, THE RIDGE WILL WEAKEN
THROUGH MIDWEEK AS SHORTWAVE-INDUCED MINOR PERTURBATIONS
PROPAGATE THROUGHOUT THE JET STREAM OVER MONTANA. EXPECT COOLER
TEMPERATURES AND INCREASED CLOUD COVERAGE TOMORROW THROUGH
THURSDAY AS A RESULT.
THE RIDGE WILL RECOVER AS THE WORK WEEK COMES TO A CLOSE.
TEMPERATURES WILL REBOUND AS SKIES CLEAR BY FRIDAY.
FAIR CONDITIONS WILL NOT PERSIST THIS WEEKEND. THE RIDGE WILL
WEAKEN AND EXIT EASTWARD AHEAD OF AN UPPER-LEVEL TROUGH THAT WILL
DIG OVER MONTANA BY SATURDAY MORNING. THE TROUGH WILL AMPLIFY AS
THE WEEKEND PROGRESSES, WITH THE ASSOCIATED LOW DIGGING AS FAR
SOUTH AS OREGON BY SUNDAY. SUBSEQUENT STRONG COLD AIR AND MOISTURE
ADVECTION WILL PRODUCE OVERCAST SKIES, POSSIBLE PRECIPITATION,
AND DAILY HIGH TEMPERATURES IN THE 50S AND 40S THIS WEEKEND AND
INTO MONDAY.
PRECIPITATION CHANCES THIS WEEKEND ARE UNCERTAIN, BUT SATURDAY
AFTERNOON RAIN COULD POTENTIALLY BECOME SNOW SUNDAY AND MONDAY AS
TEMPERATURES DIVE. IF SNOW OCCURS, GROUND ACCUMULATION IS NOT
LIKELY.
FORECAST CONFIDENCE & DEVIATIONS:
- NO CHANGES FROM THE NBM.
- THERE IS LOW CONFIDENCE IN PRECIPITATION TYPE AND AMOUNTS THIS
WEEKEND.
- THERE IS HIGH CONFIDENCE IN MUCH COOLER TEMPERATURES OCCURING
THIS WEEKEND.
DON
AVIATION
LAST UPDATED: 1930Z
FLIGHT CAT RANGE: VFR
DISCUSSION: FEW/SCT MID-TO-HIGH CLOUDS OVER THE NEXT 24 HOURS.
WINDS: S-SW AT 10 TO 12 KT WITH GUSTS UP TO 22 KT, BECOMING LIGHT
AND VARIABLE OVERNIGHT. WINDS WILL VEER SW-NW AT 05 TO 10 KT
TOMORROW MORNING.
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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