Area Forecast Discussion
Issued by NWS Missoula, MT
FXUS65 KMSO 252103
Area Forecast Discussion
National Weather Service Missoula MT
303 PM MDT SAT OCT 25 2014
.DISCUSSION...Pressure gradients are tightening ahead of an
approaching weather disturbance. Winds have strengthened in
Grangeville and the Camas Prairie with gusts of 25-35 mph. Expect
these to continue and possibly strengthen this evening and
overnight. Meanwhile, expect winds to increase across western
Montana overnight through Sunday afternoon as the front approaches
and moves through the region. Gusts of 20-30 mph are likely in
The other impact in the short term will be increasing
precipitation, especially in the mountains beginning early to mid
evening through Sunday. It will stay relatively warm tonight to
keep snow levels above 7000 feet through Sunday morning. After the
main upper low moves through by morning, snow levels will lower
to near 4500 feet by late Sunday afternoon and 4000 feet by Monday
morning. A secondary wave of energy behind the main weather
disturbance will bring another push of widespread precipitation
Sunday afternoon and night. Mountain passes, Lolo, Lookout and
Lost Trail, will be impacted with a potential for accumulating
snow, although amounts will depend on road temperatures. Expect
at least a coating of snow on the passes. Outside of roadways, expect
1-3 inches (locally more at higher elevations) above 4500 feet.
Lingering showers in the early morning hours on Monday will give
way to drier conditions Monday afternoon and overnight. Clouds are
expected to stick around, so a warm up is not expected.
The next system will move into the area Tue afternoon, with light
precipitation possible for much of the area. The Cabinet range,
Mission mountains, and passes in the high terrain could see an
inch or two of snow with this system, while the lower valleys of
western Montana and central Idaho will see light rain. Winds will
again be gusty in the higher terrain.
Currently, the end of the week looks to have a warming trend with
chances of precipitation being minimal under a building ridge.
.AVIATION...Expect mid level clouds the rest of this afternoon at
all terminals. A weather disturbance approaching the region will
bring increasing chances of rain after 26/0400z at KGPI. The main
impact for aviation will be strong gusty winds after 26/1200z at
kmso, kgpi, kbtm and ksmn.
ID...WIND ADVISORY until 5 AM PDT Sunday Orofino/Grangeville Region.