Scientific Forecaster Discussion
fxus65 kmso 211002
Area forecast discussion
National Weather Service Missoula Montana
402 am MDT Mon Oct 21 2019
Discussion...radar is showing rain and snow across central Idaho
through west central and southwest Montana. Cameras at MacDonald
and Homestake passes are showing snow covered roads thus the
winter weather advisories have been extended to southwest Montana
through mid morning when showers are expected to taper off.
After a brief break another short wave will pass through central
Idaho into west central and southwest Montana resulting in another
round of precipitation late this afternoon through Tuesday. The
difference with this system is snow levels will actually be rising
this evening through Tuesday. There could be an inch or two of
snow over Lolo and lookout passes this evening, however by
midnight snow levels should be above pass levels, around 7000 feet
by midnight and 7500 feet by Tuesday morning.
West-northwest winds will pick up and be quite brisk with gusts up
to 20-25 mph Tuesday afternoon. The chilly temperatures in the 40s
with winds will make it feel pretty raw outside Tuesday afternoon.
Dry conditions are expected Wednesday through Friday with a
gradual warming trend. Temperatures around 60 are possible Friday
Next weekend into early next week is expected to be much colder.
A large trough will develop over the region and open the door for
a cold Canadian air mass to establish itself over the region.
Showers are expected as the initial front moves in from Canada.
But it will quickly dry out Sunday into Monday with a 20 degree
drop in temperatures. Many valley locations can expect overnight
lows in the teens Sunday and Monday. It's likely areas across
southwest Montana and Lemhi County will experience single digit
lows. Temps with struggle to reach 40 Sunday and Monday.
intermittent precipitation will continue today. Lowering ceilings
and decreasing visibility accompany the more intense bands of
showers. Precipitation again becomes widespread tonight as moist
northwest flow continues into Tuesday night. Snow levels jump to
about 5000 ft this afternoon and continue to increase to around
7000-7500 feet at all terminals by Tuesday morning. Kbtm will
experience some gusty winds this afternoon after 21/1800z.
Montana...Winter Weather Advisory until 9 am MDT this morning
Winter Weather Advisory until 9 am MDT this morning
Winter Weather Advisory until 9 am MDT this morning above 4000
feet for the Lower Clark Fork region.