940
FXUS65 KGGW 201845
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
1245 PM MDT FRI MAR 20 2026
KEY MESSAGES
- ELEVATED GRASS FIRE CONCERNS THROUGH THIS EVENING.
- LOWER TEMPERATURES THIS WEEKEND WITH LIGHT RAIN SHOWER CHANCES
ACROSS CENTRAL AND PARTS OF NORTHERN MONTANA.
- MILD CONDITIONS NEXT WEEK WITH LOW END CHANCES FOR ANOTHER
WEATHER SYSTEM AFTER MIDWEEK.
DISCUSSION
WEATHER PATTERN OVERVIEW:
A FINAL WARM DAY IS EXPECTED OVER NE MONTANA TODAY. ISOLATED RAIN
SHOWERS AND BREEZY CONDITIONS WILL CONTINUE THROUGH THE EVENING.
WITH RELATIVE HUMIDITY RANGING FROM THE LOW 20S TO MID 40S AND
RAIN THAT FALLS WILL HAVE TO SATURATE THE AIR SUFFICIENTLY IN
ORDER TO REACH THE GROUND. GRASS FIRE POTENTIAL REMAINS A CONCERN
TODAY, BUT MARGINALLY. DRY FUELS AND LOW RH ARE THE MAIN FACTORS
TODAY. AS FOR PRECIPITATION TOMORROW, MODEL AGREEMENT IS HIGH FOR
LIGHT RAIN IN THE AFTERNOON. LITTLE TO NO ACCUMULATION IS
EXPECTED BOTH TODAY AND TOMORROW.
ENSEMBLES SHOW UPPER RIDGING RETURNING ACROSS THE WESTERN U.S. FOR
EARLY NEXT WEEK WITH DRY WEATHER AND WARMING TEMPERATURES AGAIN.
THAT SAID, EMBEDDED SHORTWAVES AND RIDGE FLATTENING TOWARD THE
MIDDLE OF THE WEEK WILL KEEP THE WARM UP SHORT LIVED AND RAIN
SHOWER CHANCES REMAINING ACTIVE ACROSS THE REGION.
FORECAST CONFIDENCE & DEVIATIONS:
BLENDED HRRR FOR DAY 1-2 WINDS AND NBM90 FOR DAY 1-2 WIND GUSTS.
USED A BLEND OF HIRES MODELS TO NUDGE MIN RH VALUES LOWER IN
SOUTHWEST ZONES AND MAINTAIN MODERATE RH IN THE NORTHEAST ZONES.
AVIATION
LAST UPDATE: FRIDAY MARCH 20 AT 1800Z
FLIGHT CATEGORY: VFR
DISCUSSION: VFR CONDITIONS THROUGH THE TAF CYCLE. SCATTERED,
BRIEF RAIN SHOWERS ARE POSSIBLE THROUGH THE AFTERNOON.
WIND: WEST AT 10 TO 20 KTS, DECREASING TO 5 TO 10 KT TONIGHT.
WINDS INCREASE BACK TO 20 TO 20 KTS AND VEER NORTH TOMORROW.
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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