Area Forecast Discussion
Issued by NWS Missoula, MT
FXUS65 KMSO 061058
Area Forecast Discussion
National Weather Service Missoula MT
358 AM MST Fri Dec 6 2013
...Dangerously cold temperatures & wind chill expected today
through Saturday morning...
.DISCUSSION...The second push of arctic air has finally made its
arrival across western Montana resulting in dangerously cold wind
chill readings early this morning. Windy conditions will continue
throughout the day as the frigid air filters into the region and
although the sun may shine, little warmth will be felt due to the
extreme wind chill. Temperatures will again take a nose dive
tonight, especially north of roughly Interstate 90 where mostly
clear conditions are anticipated. These locations will be the
most susceptible to extremely dangerous wind chill readings
tonight with some places eclipsing 40 and perhaps even 50 below
zero! South of Interstate 90 temperatures may take a little longer
to fall due to increasing cloud cover and developing light snow.
But bitter cold low temperatures are still expected to develop as
well as extremely dangerous wind chill values throughout the
Make no mistake about it, this is an extremely dangerous situation
for exposed human skin, family pets and livestock as frostbite
will be possible in a little as 10 minutes! Please take the
necessary precautions to ensure the safety of yourself and those
you love during these extreme conditions.
All models continue to show a period of drying throughout the
atmosphere Saturday night into Sunday morning. This should result
in a clear sky and most likely the coldest morning across all of
western Montana and central Idaho. Thankfully light winds are
expected across much of the area with only the more wind prone
locations (Helmville, Avon, Hellgate & Badrock Canyon for example)
will see extreme wind chill values. However many locations will be
approaching record low temperatures by Sunday morning.
Next week will start out under northerly flow with the flow eventually
turning more northwesterly and eventually westerly as the week
progresses. This type of flow is historically known to be fairly
tough to forecast with even the most subtle of weather features
having the potential to produce snowfall, especially when the
atmosphere is already very cold. So chances of precipitation will
steadily increase as the week progresses and the flow gradually
moistens. Temperatures will also show a gradual warming trend as
the arctic air mass modifies and moderates. Near normal temperatures
appear possible by next weekend.
.AVIATION...The arctic air mass has arrived in western Montana
bringing very cold wind chill and breezy northeast winds. KGPI and
KMSO will continue to see breezy winds throughout the day today. A
slight increase of pacific moisture will lead to growing cloud
coverage obscuring area terrain with very light snow showers
possible this afternoon into the evening for KSMN and KBTM.
MT...WIND CHILL WARNING until 11 AM MST Saturday Butte/Blackfoot
Region...Potomac/Seeley Lake Region...West Glacier Region.
WIND CHILL WARNING until 11 AM MST Saturday Bitterroot/Sapphire
Mountains...Kootenai/Cabinet Region...Lower Clark Fork
WIND CHILL WARNING until 11 AM MST Saturday Flathead/Mission
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