333
FXUS65 KGGW 031936
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
136 PM MDT MON AUG 3 2026
KEY MESSAGES
- MUCH COOLER TONIGHT WITH LOWS IN THE 40S. TEMPERATURES CLIMB
THROUGH THE WEEK, RETURNING TO LOW 90S BY THURSDAY.
- PASSING RAIN SHOWERS MOVING WEST TO EAST WILL BRING LIGHT RAIN
TO THE REGION. RAIN TOTALS WILL STAY BELOW 0.10 INCHES.
- NORTHWEST WINDS THIS AFTERNOON AND EVENING WILL CAUSE IMPACTS
TO RECREATION ON FORT PECK LAKE. LAKE WIND ADVISORY THROUGH 9 PM
TONIGHT.
DISCUSSION
WEATHER PATTERN OVERVIEW:
AS THE UPPER TROUGH DEEPENS AND PUSHES EAST OUT OF THE REGION, IT
CONTINUES TO PUSH A COOLING AIRMASS SOUTHEASTWARD. WE'LL BE SEEING
MUCHBELOW AVERAGE TEMPERATURES THIS AFTERNOON AND TONIGHT WITH
LOWS IN THE 40S. AN ISOLATED DIP INTO THE UPPER 30S WILL NOT BE
OUT OF THE QUESTIONS, DEPENDING ON CLOUD COVER. PASSING RAIN
SHOWERS WILL CONTINUE THROUGH THE EVENING AS THEY MOVE EAST OUT OF
THE REGION. ACCUMULATION WILL OVERALL BE LIGHT, MOST LOCATIONS
SEEING NOT MUCH MORE THAN A FEW HUNDREDTHS, BUT COULD BE UP TO
0.10" IN SOME PLACES SEEING STEADIER RAINFALL AND BETTER UPPER
LEVEL SUPPORT.
LONGER TERM, ENSEMBLES FULLY EXIT THE TROUGH TO THE EAST BY
WEDNESDAY ALLOWING A NEW RIDGE TO ESTABLISH OVER THE PACIFIC
NORTHWEST. THIS WILL SLOWLY EXTEND INCREASING HEIGHT RISES AND
LOWERING RH VALUES OVER EASTERN MONTANA WITH NORTHWEST FLOW
ALOFT, BRINGING A STEADY INCREASE IN TEMPS. HIGHS THURSDAY WILL
REACH UP TO LOW 90S AND LOOK TO LAST INTO THE BEGINNING OF THE
NEXT WEEK. FRIDAY LOOKS TO BE THE HOTTEST DAY AT THIS TIME, BUT
FURTHER MODEL RUNS HAVE BEEN BRINGING WARMER TEMPERATURES EARLIER
TOWARDS MIDWEEK. THE CURRENT RIDGE CREST LOOKS LIKE IT MAY PASS
THE REGION AROUND SUNDAY, WHICH COULD INTRODUCE INCREASED CHANCES
FOR RAIN THEREAFTER.
FORECAST CONFIDENCE & DEVIATIONS:
DEVIATIONS FROM NBM INCLUDED ARW AND SREF BLEND FOR POPS THROUGH
THIS EVENING. INCREASED WINDS FOR A FEW HOURS THIS AFTERNOON
FOLLOWING OBS. USED HRRRSMOKE DATA IN FOR VIS, MOSTLY TO REMOVE
ERRONEOUS NBM/GLAMP LOWERED VISIBILITIES.
AVIATION
LAST UPDATE: 1830Z
FLIGHT CAT RANGE: VFR
DISCUSSION: PASSING RAIN SHOWERS MOVING WEST TO EAST WILL BRING
PERIODS OF LIGHT RAIN TO AREA TERMINALS. SHOWER WILL EXIT THE
REGION BY 0Z TONIGHT. DRIER CONDITIONS RETURN FOR TOMORROW.
WIND: NORTHWEST AT 15 TO 25 KTS BECOMING WEST AT 5 TO 10 KTS
DURING THE NIGHT. NORTHWEST WINDS 10 TO 15 KTS RETURN AFTER
SUNRISE.
GGW WATCHES/WARNINGS/ADVISORIES
LAKE WIND ADVISORY UNTIL 9 PM MDT THIS EVENING FOR CENTRAL AND
SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-GARFIELD-MCCONE-
PETROLEUM.
WEATHER.GOV/GLASGOW
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