FXUS65 KGGW 192007
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
207 PM MDT Fri Jul 19 2024

.DISCUSSION...

KEY MESSAGES:

- Isolated/scattered thunderstorms are again possible mainly late
  in the day Saturday mainly over the eastern zones.

- Highs will be in the upper 80s or the 90s most of the time for
  the next several days. Some locations will have highs near 100
  beginning the middle of next week, possibly 110 Thursday.

- Haze from Canadian wildfires is expected to move into the area
  the next couple days.

WEATHER PATTERN OVERVIEW:

Upper air pattern showing a strong upper ridge over the western
states and provinces of Canada. A weak disturbance will bring
another chance of late-day thunderstorms Saturday, with the best
chance over the eastern zones. Then things remain nearly
stationary into Tuesday.

Then the upper ridge intensifies over the area by the middle of
next week as an upper low moves into British Columbia. This will
push the mercury up over the century mark as a SW upper flow
develops. Right now, NBM 90 Percentile is giving some areas 110
for highs on Thursday. This will require Heat headlines if this
materializes. Stay tuned.

Beyond this, the upper low weakens as it moves east so no
significant cool down is expected and low level westerly flow will
push instability/humidity over to the Dakotas. TFJ

FORECAST CONFIDENCE & DEVIATIONS:

High confidence of the ridge intensifying early next week with
highs in the 90s most of the time and some areas near 100
Wednesday and Thursday.

Confidence in the specific location and timing of any
thunderstorms is low to medium at this point.


&&

.AVIATION...
FLIGHT CONDITION: VFR, brief MVFR with any heavy rainshowers.

DISCUSSION: Scattered thunderstorms this afternoon are moving
slowly, producing brief heavy downpours, and may contain
gusty/erratic winds in their vicinities.

Otherwise, thunderstorms will diminish this evening with light and
variable winds expected into Saturday morning.

Scattered thunderstorms can be expected again Saturday afternoon
in a similar location to today. TFJ

&&

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

$$

weather.gov/glasgow