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FXUS65 KGGW 250032
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
632 PM MDT Thu May 24 2018

.DISCUSSION...
Evening Update...
Have updated PoPs to reflect the ongoing isolated to scattered
showers and storms across the area. These storms should dissipate
quickly after 8 to 9 PM with skies clearing out overnight. Chance
of a quick shower in the Glasgow area, but most of the
precipitation is expected to stay across northern and eastern
Valley County.

Original discussion...
Upper pattern continues to be progressive with an upper trough
moving out this afternoon from the NE zones. Scattered
thunderstorms in this area will diminish while an upper jet keeps
late day showers/thunderstorms going over the SW zones into the
early evening hours. Gusty winds may accompany these storms as
they bring the mid-levels winds to the surface.

Then an upper ridge builds into Montana as a closed upper low
moves into California. This scenario will allow temperatures to
warm, reaching 90 degrees for most areas Saturday afternoon.
Although not a record, this will feed the severe thunderstorm
threat late in the day.

This will come as the upper low moves east and effects begin to
move in on SW upper flow. SPC has the entire area in a marginal
risk.

Canadian high pressure dries out the northern zones for Sunday
while the upper low is slow to move east as a Tropical Storm moves
into the central Gulf coast. Then effects from the upper low north
for Sunday Night and Monday, mainly affecting the southern zones.
This finally moves to our east about late Tuesday, but an upper
longwave trough moves in for more unsettled conditions later in
the week. TFJ


&&

.AVIATION...
Flight Condition: VFR

Showers/thunderstorms will diminish this evening and stay mostly
away from the TAF sites. A small possibility of fog exists for
late tonight if skies can clear with light winds.

Great flying weather is expected Friday with warming conditions.
Winds will increase out of the west during the afternoon with
gusts up to 20 to 25 knots possible at times.
-Mottice

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

$$

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