332
FXUS65 KGGW 182058
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
258 PM MDT Wed Sep 18 2024

.DISCUSSION...
KEY MESSAGES:

1) Lots of rainfall in Petroleum and eastern Fergus counties (3 to
4+ inch amounts) with the latest storm, that will continue to
give a heightened awareness for rising streams in mainly
Petroleum County.

2) A High Wind Warning remains in effect for gusts to near 60 in
Petroleum County through 9 pm. A Lake Wind Advisory is now in
effect from Midnight tonight through 6 PM Thursday.

WEATHER PATTERN OVERVIEW:
A vertically stacked/occluded low pressure system over eastern
Montana will continue to drift northeast tonight. The wrap-around
rainfall over central Montana is expected to weaken as it passes
over NE Montana tonight. NW winds will increase from SW to NE
tonight as the low pulls away. A Lake Wind Advisory is in effect
from Midnight tonight till 6 PM Thursday.

On Thursday, the backside of the storm will exit with clearing
from SW to NE. Temperatures will rebound a few degrees, but remain
close to normal.

A broad upper trough over western Canada will help to send in
another cold front late Friday. This will allow for a cool down
for the weekend. Shower chances should remain over the southern
zones Friday Night.

An upper ridge will build into area beginning Tuesday allowing for
a warm up. Look for temps to return to above normal levels.

FORECAST CONFIDENCE & DEVIATIONS:

Didn`t stray from model consensus too much, but did blend with
NBM90 for winds into this evening.


&&

.AVIATION...
Last Updated: 2030Z

CATEGORY: Occasional MVFR tonight then becomes VFR Thursday.

DISCUSSION: Light rainshowers will move northeast into the TAF
sites later tonight and weaken but MVFR ceilings will follow.
These ceilings are then expected to dissipate or lift Thursday.

WINDS: A surface low moving NE across the TAF sites bringing a
period of variable winds through early evening (till 03Z) will
move to our northeast and NW winds will then increase tonight.
Speeds of 10 to 20 knots are expected late tonight into Thursday
morning before diminishing late in the day.


&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory from midnight tonight to 6 PM MDT Thursday
for Central and Southeast Phillips-Central and Southern Valley-
Garfield-McCone-Petroleum.

High Wind Warning until 9 PM MDT this evening for Petroleum.

&&

$$

weather.gov/glasgow