Glasgow, Montana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

816
FXUS65 KGGW 150835
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
235 AM MDT Fri Aug 15 2025

.DISCUSSION...

KEY MESSAGES:
- A ridge developing to the west will raise temperatures into the
  upper 80s and 90s for highs through the weekend and into next
  weekend.

- Next isolated chances(10-30%) for Precip over 0.10" exist
  Saturday and Sunday evening with passing thunderstorms.

- A marginal risk for severe thunderstorms exist Saturday
  afternoon and evening.


WEATHER PATTERN OVERVIEW:
Morning showers and thunderstorms are occurring across the area
today. These should dissipate before noon while lifting to the
northeast slowly.

Tonight into next week, a ridge to the west will slowly begin to
build. this ridge will slowly and subtly shift upper level flow
depending on what side of Montana it sits on at any moment. When
it moves more toward the east or gets repressed from the north
showers will be more likely, when it moves west or amplifies drier
conditions will hold sway.

That being said both Saturday and Sunday evening appear to be
periods where the ridge flattens enough to allow some lift and
pacific moisture to move into the area and generate a few isolated
to scattered showers and thunderstorms during peak heating and
hold on till about midnight. Saturday in particular already has a
marginal risk for severe thunderstorms with small chances (~5%)
for damaging winds or large hail in northeast Montana. Both
evenings also have a slight chance(10-30%) for rain up to 0.10"
for parts of northeast Montana.

The peak of the western CONUS ridge will move across northeast
Montana Tuesday and Wednesday. Using Glasgow as an example, while
highs currently hover around 93-94 degrees for these days the
temp range from the NBM10 to NBM90 is very wide, with 91-105
respectively. Highs have already risen 3 degrees in the last 12
hours and bias correction from the last month`s worth of much
cooler temps may finally give way to near 100 degrees for these
days with future forecasts. These periods will be watched for heat
advisory potential in future forecasts. Fully expect the warming
trend to continue.


FORECAST CONFIDENCE & DEVIATIONS:
Minor hourly deviations in PoPs and Sky were made for the first
15 hours of the forecast based on current radar and satellite
trends. NPoP CAMs models were used to replace NBM data during
these times.

Confidence is high in scattered showers and thunderstorms Saturday
and Sunday evening.

Confidence is moderate to low in isolated severe storm pockets
Saturday evening.

Confidence is moderate in very hot temperatures Tuesday and
Wednesday which may approach 100 degrees.


&&

.AVIATION...

LAST UPDATED: 0800Z

FLIGHT CATEGORY: VFR.

DISCUSSION: Scattered showers and a few isolated thunderstorms
formed just south of the MIssouri River early this morning and may
impact KSDY, KOLF, and KGDV at times through roughly 18Z. There
is not expected to be enough precip with these storms to drop
visibility below VFR this morning. Afterward, conditions should
clear out through the remainder of the TAF cycle.

WIND: NE to E at 5 to 10 knots this morning. Veering E and
increasing to 10 to 15 kts this afternoon and evening.

GAH


&&

.GGW WATCHES/WARNINGS/ADVISORIES...
None.


&&

$$

weather.gov/glasgow