Brockton, Montana Weather Forecast Discussion

678
FXUS65 KGGW 240632
AFDGGW
Area Forecast Discussion
National Weather Service Glasgow MT
1232 AM MDT Wed Sep 24 2025
.DISCUSSION...
KEY MESSAGES:
- Warm temperatures will decrease a bit after today due to a few
  dry cold frontal passages tomorrow and Friday.
- The next disturbance is forecast to arrive on Tuesday next week,
  but uncertainty is high for precipitation with this system.
WEATHER PATTERN OVERVIEW:
An upper level ridge moving over western Montana will bring warm
and dry conditions. The trough that moved through Montana earlier
this week has deepened and formed a quasi omega block with another
low off the southern California coast. Zonal flow over northern
Montana and Canada will keep the region dry and drive southwest
flow today. A shortwave in this zonal flow aloft will flatten the
ridge enough tonight to allow a weak cold front through the
forecast area with somewhat cooler temperatures on Thursday. A dry
upper trough on Friday will cool temperatures a few more degrees
and bring breezy conditions. There is high confidence a Lake Wind
Advisory will be needed for Thursday night into Friday.
FORECAST CONFIDENCE & DEVIATIONS:
Increased winds with a mix of the NBM and NBM 90 for Day 1 and Day
2 night. Increased wave heights for the arrival of the cold front
on Thursday night into Friday. Confidence is covered in the
discussion above.
&&
.AVIATION...
UPDATE: 0730Z, September 24
FLIGHT CAT RANGE: VFR
DISCUSSION: Skies will remain mostly clear with FEW-SCT high level
clouds through the TAF cycle.
WIND: For KGGW, southeast at 5 to 10 knots, becoming southwest at
10 to 15 knots after 18Z, becoming north at 5 to 10 knots after
04Z. For all other sites, light and variable becoming southwest at
10 to 15 knots after 18Z, becoming light and variable after 02Z.
EQUIPMENT: KSDY AMD NOT SKED will remain in place
until METARs comms issue is repaired.
&&
.GGW WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
weather.gov/glasgow

NWS GGW Office Area Forecast Discussion