Area Forecast Discussion
Issued by NWS Missoula, MT
FXUS65 KMSO 251805 AAC
Area Forecast Discussion...UPDATED
National Weather Service Missoula MT
1105 AM MST THU DEC 25 2014
.UPDATE...Allowed all remaining winter weather advisories to
.DISCUSSION...Given that snowfall has all but totally diminished
across the Northern Rockies, and associated travel threats have
greatly reduced as a result, the winter weather advisories were
allowed to expire.
.AVIATION...Snow will be on the decrease through north central
Idaho and western Montana today as a trough and low pressure
system exit the region. Some clearing of cloud cover is showing up
on current satellite loops in northern Idaho and northwest Montana
and this is expected to expand southward through today. There will
be a mix of light snow showers, cloud cover, and a little sun
through today. Another shortwave will pass tonight that will bring
increased cloud cover, obscured terrain, and light snow.
PREV DISCUSSION... /ISSUED 340 AM MST THU DEC 25 2014/
.Widespread snow followed by wind and cold this weekend...
DISCUSSION...Most people throughout western Montana and north
central Idaho will wake up to a fresh coating of snow. Light snow
will fall through this morning in many locations with little if
any additional accumulation after around 7 AM MST. Snow advisories
will remain through this morning mainly for snow covered roadways.
Some clearing is possible through today as weak high pressure
passes through the region.
Another shortwave passing out of Canada tonight will bring light
snow overnight and through Friday. Any accumulations are expected
to be light and generally less than half an inch.
The main story for rest of the forecast is the likelihood of
another snow event, followed by a very cold temperatures,
beginning Saturday afternoon. North central Idaho and northwest
Montana are in the path for best snow accumulations Saturday
afternoon through Sunday though most of the area will see snow
accumulations by Sunday afternoon. Widespread travel impacts are
likely with this storm system. There is also good agreement that
gusty north and east winds will develop late Sunday as an arctic
front moves through the region. Widespread single digit
temperatures with below zero temperatures along the divide are
expected Monday morning. Wind chill -10 to -20 will also be
common. Low temperatures are likely to be even colder on Tuesday
with cold high temperatures through the middle of the week.
Stay tuned for updates as there is a high potential for widespread
impacts this weekend.