428
FXUS65 KGGW 081006
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
406 AM MDT Tue Jul 8 2025

.DISCUSSION...

KEY MESSAGES:
1) Hot weather will return Tuesday and Wednesday with highs in
the 90s and near 100 respecitvely. A Heat Advisory exists for
Wednesday specifically.

2) Cooler conditions to follow Thursday and Friday with gusty NW
winds on Thursday.

3) Isolated to scattered showers/thunderstorms expected with a
cold front Wednesday evening through Friday morning. Some
thunderstorm wind bursts could be severe Wednesday evening.


WEATHER PATTERN OVERVIEW:
mainly sunny/clear conditions will linger into Wednesday morning
as an upper ridge will build into eastern Montana. With W or SW
flow (and compressional warming), temperatures will warm with
highs in the upper 80s and 90s Tuesday, 90s to low 100s Wednesday.
This will lower humidities to the teens in most areas on
Wednesday. At this point, west to SW winds will be less than 15
mph. Elevated fire weather conditions are possible with the low RH
but more wind would be needed for critical fire weather
conditions to occur. That being said a potential for dry
thunderstorms could lead to gusty or severe downburst winds which
attracts more attention Wednesday evening. Ther is no Watch Yet,
but if this hold it may exists this afternoon. Heat impact levels
are currently forecasted at high and a Heat Adviosry was put out
for areas that are expected exceed 100 degrees.

An upper trough moves across the Canadian Prairies Wednesday
night & Thursday which will bring a cold front through NE Montana
Thursday morning with cooler temperatures. The system will bring
a chance of showers and thunderstorms Wednesday night and possibly
Thursday Night. However, more thunderstorms than showers are
possible Wednesday night which could provide fire starts.

Cooler air is expected Thursday and Friday then warmer temperatures
return for the weekend. Another cool down will be possible Monday
with isolated chances for rain.


FORECAST CONFIDENCE & DEVIATIONS:
There is high confidence of temperatures reaching the 90s to near
100 for many locations by Wednesday.

Dry thunderstorms with gusty to severe Thurndserstorms late
Wednesday afternoon and early evening is only moderate to low
confidence.

Deviations include Sky set to clear rather than partly cloudy
through much of this morning and PoPs and Thunder raised across
the far western zones in the later afternoon as some HREF members
are dragging through thunderstorms a bit earlier than NBM
Wednesday.

GAH


&&

.AVIATION...

LAST UPDATED: 1030Z

FLIGHT CAT RANGE: VFR.

LLWS: Low level wind shear will be possible at the terminals from
roughly 06 to 11Z tonight.

DISCUSSION: Clear skies today with maybe a few high to mid clouds
moving ino tonight after sunset.

WINDS: SE to E at 5 to 15 kts through the day and into the
evening. Gaining a S component at KSDY and KGDV early Wednesday
morning.

GAH


&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Heat Advisory from 10 AM to 9 PM MDT Wednesday for Central and
Southeast Phillips-Central and Southern Valley-Dawson-Eastern
Roosevelt-Garfield-McCone-Northern Phillips-Petroleum-Prairie-
Richland-Southwest Phillips-Western Roosevelt-Wibaux.


&&

$$

weather.gov/glasgow