Area Forecast Discussion
Issued by NWS Great Falls, MT

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979
FXUS65 KTFX 262300
AFDTFX

Area Forecast Discussion
National Weather Service Great Falls MT
500 PM MDT Fri May 26 2017

...UPDATED AVIATION SECTION...

.SYNOPSIS...

Dry weather is expected for most areas through the upcoming
Memorial Day weekend. However, an isolated afternoon shower or
thunderstorm cannot be ruled out, especially in the mountains.
Temperatures will gradually warm through the weekend, and into the
middle of next week. A better chance of showers and thunderstorms
may return by late next week.

&&

.DISCUSSION...

Tonight through Sunday...A high amplitude ridge over the interior
PacNW will drift slowly eastward through the weekend. The overall
forecast indicates dry and mild weather, but with isolated showers
and thunderstorms possible mainly over higher terrain. A weak
disturbance moving through the northerly flow aloft on Saturday
is forecast to maintain mostly cloudy skies across North-central
MT, but with otherwise little impact on the Holiday weekend
weather. High temperatures will gradually warm through the 70s to
near 80 by Sunday afternoon. Those spending time outdoors this
weekend are reminded to apply sun protection and to practice
safety when on or near water, as rivers are running strong and
cold. PN

Sunday Night through Friday...An upper level ridge of high pressure
will reside over much of the region from Sunday night through
Thursday. Expect a few isolated showers and thunderstorms to move
through the region from Sunday night through Wednesday night. The
best chance for any precipitation will be in the mountains, but a
passing shower or thunderstorm cannot be ruled out at lower
elevations. Shower and thunderstorm potential may increase Thursday
and Friday, when disturbances may begin to break-down the
aforementioned ridge. A gradual warming trend to much above normal
temperatures is expected by Wednesday and Thursday, while Friday may
have slightly cooler readings. Brusda/Jaszka

&&

.AVIATION...
Updated 2300Z.

VFR conditions will continue for at least the next 24 hours across
North Central and Southwest Montana. Lingering clouds, scattered
showers, and breezy northwest winds will likely diminish by 03Z,
with these calmer conditions continuing through 16Z. After 16Z, it
will be a similar situation to today, as daytime heating will
increase mid level cloudiness and mix down northwest winds, but
shower activity will likely be limited to the mountains.
Coulston

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  46  71  47  75 /   0  10  10  10
CTB  45  72  45  73 /   0   0  10  10
HLN  46  72  48  78 /  10  10  10  10
BZN  39  67  41  74 /  10  10  10  10
WEY  30  58  31  65 /  40  20  10  20
DLN  39  66  41  73 /  10  10  10  10
HVR  46  75  47  77 /  10  10   0  10
LWT  42  66  44  70 /  10  10  10  20

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

weather.gov/greatfalls



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