Area Forecast Discussion
Issued by NWS Missoula, MT
FXUS65 KMSO 272041
Area Forecast Discussion
National Weather Service Missoula MT
241 PM MDT Thu Apr 27 2017
.DISCUSSION...And the rainy pattern continues! Showers are
becoming more widespread across western Montana and north central
Idaho. Snow has been visible on area webcams in locations sitting
around 4000 feet and higher. So far, snow is not sticking to road
surfaces, even those that traverse mountain passes. With both
ambient temperatures and road surface temperatures dropping
this evening, this could cause some areas to collect a quick
coating of snow (again: around and above 4000 feet). That being
said, snow will quickly melt around sunrise Friday.
Friday will be another day plagued by showers throughout the
day...but! The good news is: conditions should start to finally
improve through the evening and overnight hours, leading to a
mostly dry day on Saturday. Saturday morning will start out
chilly, but will warm to around the mid 50s to low 60s area wide.
And while the day should be a mix of sun and clouds, the only
exception will be afternoon showers that could develop across
northwest Montana and along the spine of the Divide.
Unfortunately the nice weather we`ll have Saturday will not last
long. We are watching another shortwave trough forecast to move
into the Northern Rockies Sunday. So, expect widespread showers
and overcast skies throughout the region for much of the day. The
mountains of northwest Montana and north-central ID will likely
see the more moderate, persistent rain and high mountain snow,
while the valleys will see a few brief periods with breaks in the
light rain. Gusty west-northwest winds will also be present in the
afternoon, with gusts up to 25-30 mph for the valleys of western
A moist northwesterly flow will linger over the region for Monday
and Tuesday, that will keep scattered valley rain showers and
mountain snow showers in the forecast. Tuesday afternoon will have
the best chance for more widespread moderate rainfall.
Temperatures will remain a few degrees below normal for this time
of the year.
The good news! We are gaining more and more confidence that we`ll
see a fairly strong ridge building over the region for Wednesday
and Thursday. We should see much drier weather and perhaps above
normal temperatures, with the warmest day of the year for
Thursday. Fingers crossed.
.AVIATION...Periodic rain showers will be common for all terminals
now through Friday, with some rain mixing with snow at times at
KGPI, KGVL, and KBTM after 28/0300Z or thereafter. Reduced
visibility and low ceilings will result for these aforementioned
terminals. Elsewhere, breezy N-NW winds and rain showers will be
the main aviation impact through Friday.