Area Forecast Discussion
Issued by NWS Great Falls, MT

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FXUS65 KTFX 232128
AFDTFX

Area Forecast Discussion
National Weather Service Great Falls MT
328 PM MDT Fri Sep 23 2016

.DISCUSSION...

Tonight through Sunday...The Pacific trough responsible for the
widespread precipitation the last couple of days will gradually
move out of the area through Saturday. Moisture wrapping around
the main upper low pressure area will keep isolated showers over
North Central Montana and scattered showers over the southwest as
the low moves east across Wyoming. Breezy westerly winds will also
spread over the area during this time. Although skies will
partially clear across North Central Montana tonight, am thinking
that there will be enough wind to prevent widespread fog
development, but will keep an eye on the situation. A high
pressure ridge will then begin building into Montana Saturday
night into Sunday, bringing drying and warming conditions to the
area with continued breezy westerly winds. Lows mostly in the mid
30s to mid 40s tonight will likely cool mostly into the 30s for
Saturday night due to less cloudiness and wind. Highs over the
weekend will gradually warm into the upper 50s to mid 60s by
Sunday.  Coulston

Sunday night through Friday...Next week will start off with upper
level ridging over the Northern Rocky Mountains. Dry conditions
will prevail Sunday night through Wednesday morning with
temperatures warming to near 70 on Monday and into the upper 70s
Tuesday. Wednesday afternoon through Sunday will see an
increasingly moist west to southwest flow aloft as the ridge is
flattened by a weather system moving through western/central
Canada and another trough develops along the Pacific Northwest
Coast. Am expecting to see a gradual decrease in high
temperatures Wednesday through Friday with isolated/scattered
showers possible each day, especially over the western mountains.
mpj

&&

.AVIATION...
Updated 1740Z.

Mid- to upper-level low pressure center over Northeast UT will
move northeastward to near Southeast MT by 18Z/Sat. Predominantly
VFR expected during period. However, occasional MVFR/IFR CIGS/VIS
are possible in and near rain showers, especially along and east
of a KHVR to KBZN line. Expect widespread mountain obscuration,
especially through 12Z/Sat. Abundant cloud cover and some
strengthening of surface winds should preclude fog formation
overnight tonight. Jaszka

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  46  58  40  66 /  20  20  10   0
CTB  43  57  39  66 /  10  20  10   0
HLN  43  60  39  69 /  30  10  10   0
BZN  41  58  36  65 /  50  30  10   0
WEY  32  50  27  60 /  80  20   0   0
DLN  38  57  34  65 /  40  20   0   0
HVR  47  62  39  66 /  20  20  10   0
LWT  45  54  38  62 /  50  40  10  10

&&

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

$$

weather.gov/greatfalls



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