Area Forecast Discussion
Issued by NWS Great Falls, MT

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FXUS65 KTFX 271758
AFDTFX

Area Forecast Discussion
National Weather Service Great Falls MT
1155 AM MDT Thu Apr 27 2017

...Aviation Section Updated...

.UPDATE...

Areas of rain and mountain snow continue today under mostly cloudy
skies. Temperatures will remain well below average. Highway
reports indicate generally wet roads on mountain passes, so winter
weather advisories were cancelled for Marias and Kings Hill
passes. New snow accumulation is not expected on road surfaces
over SW MT, but roads there remain icy in sections, so will allow
the winter weather advisory to continue through expiration at
noon. Raised PoPs with this update for today, and expect showers
or periods of light rain to continue throughout the afternoon and
evening across all but far southwest MT. PN

&&

.AVIATION...
Updated 1755Z.

Scattered rain and snow showers are expected to continue through the
remainder of the daytime hours and into the night across most of
North Central and Southwest Montana. VFR with temporary MVFR
conditions (in heavier showers with lowering ceilings) will be
present through the daylight hours today, with the potential for
some IFR conditions tonight and during the early morning hours
tomorrow at the KLWT terminal. Mountains are expected to be obscured
at times through the 2718/2818 TAF period. - Moldan

&&

.PREV DISCUSSION...
/ISSUED 550 AM MDT Thu Apr 27 2017/
Today through Friday...An upper level trof of low pressure will
continue to reside over the region today. As a
result...scattered/numerous showers will affect much of the region
through the day today. Snow is likely in the
mountains...especially above 6000 feet. The winter weather
highlights will continue, with overall new snow accumulations
generally 1 to 2 inches this morning. The highlights could be
extended later today into tonight/Friday morning, as an additional
2 to 5 inches is possible at higher elevations. Otherwise
afternoon temperatures will be below normal once again today. The
cool temperatures will continue into Friday. The precipitation
should begin to diminish over the north on Friday, but
scattered/likely chances for precipitation will continue across
the Southwest. Brusda

Friday Night through Next Thursday...Unsettled weather will persist
into the upcoming weekend as a longwave upper trough exits the CWA
to the east Friday night into Saturday, while a shortwave trough
dives southeastward into our area Saturday night into Sunday. For
Monday and Tuesday, flow aloft becomes northwesterly in response to
upper ridging building-in from the west, yet multiple disturbances
embedded in the flow look to traverse the region from northwest to
southeast. Thus, scattered precipitation should persist. By
Wednesday and Thursday of next week, a drying and warming trend is
expected for North-Central and Southwest Montana as the
aforementioned ridge continues to build over the CWA. Lows will tend
to be near normal throughout the period. As for highs, values will
remain slightly below normal this weekend through Tuesday. Highs
should then moderate to near or slightly above normal by next
Wednesday and especially Thursday. Jaszka

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  46  33  50  30 /  90  50  40  10
CTB  42  32  50  31 /  80  40  20  20
HLN  50  34  52  33 /  50  30  50  20
BZN  45  31  47  28 /  60  50  60  20
WEY  36  23  39  22 /  60  50  40  20
DLN  44  28  48  28 /  40  30  40  20
HVR  47  34  54  32 /  70  40  20  10
LWT  44  32  44  27 /  70  60  60  10

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory until noon MDT today above 6000 feet for
Gallatin...Madison.

&&

$$

weather.gov/greatfalls



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