textproduct: Glasgow
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- A warming trend will continue through Memorial Day Weekend. Highs could be approaching 100 degrees in some locations on Tuesday. - Hot temperatures, low humidity will raise fire weather concerns for Monday and especially Tuesday when gusty southeast winds develop.
- Scattered thunderstorms are expected by Tuesday evening moving in from west to east, with an isolated stronger storm possible.
DISCUSSION
WEATHER PATTERN OVERVIEW:
Upper ridging will continue to advance from the west over Memorial Day Weekend. Look for progressively warmer and even hotter daytime temperatures along with very dry afternoon relative humidity each day. High temperatures by Memorial Day will be well into the upper 80s to mid 90s for most of NE Montana while relative humidity reaches as low as 12 to 15 percent.
On Tuesday as the ridge slides over to the east, low level southeast winds will ramp up, with high temperatures in the 90s and humidity readings between 10 and 20 percent. This combination in the presence of dry fuels may lead to fire concerns. Even where green up is underway, curing may take place from consecutive hot and dry weather days. Gusty southeast winds may also present boating hazards for Fort Peck Lake.
On Tuesday evening, an upper trough will move in from the west while thunderstorms will across central Montana. These storms will make progress eastward into NE Montana. An isolated stronger thunderstorm is certainly possible, with the greatest coverage expected to be for areas west of a line through OPheim to Glasgow to Jordan.
FORECAST CONFIDENCE & DEVIATIONS:
Confidence is increasing that the culmination of hot, dry, and windy conditions along with drying fuels may present fire weather concerns by Tuesday. Meanwhile, there is growing indication by NBM on thunderstorms moving into the area during the evening. Details will come more into focus once this is captured by near term high resolution guidance solutions.
AVIATION
LAST UPDATED: Saturday May 23, 2026 at 1945Z.
FLIGHT CAT RANGE: VFR.
DISCUSSION: Mid level clouds will be present across area terminals at times through the taf period.
WIND: light and variable tonight, becoming west at 5 to 15 kts on Sunday.
EQUIPMENT: KSDY obs are unavailable and will be AMD NOT SKED.
GGW WATCHES/WARNINGS/ADVISORIES
None.
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