Area Forecast Discussion
Issued by NWS Missoula, MT
FXUS65 KMSO 121029
Area Forecast Discussion
National Weather Service Missoula MT
429 AM MDT Wed Mar 12 2014
High pressure will be the dominant weather feature present today
over the Northern Rockies. Patchy dense valley fog will exist
through this morning across northwest Montana and north central
Idaho. Dense fog highlights will remain in-place for now, however
the proliferation of fog may need to be re-evaluated soon. Afternoon
temperatures will warm a bit, with mostly clear skies developing
throughout the day.
A weak disturbance will move over northwest Montana on Thursday,
bringing some very light precipitation and cloud cover to the
region. The most significant impact of this system will be to
A more significant storm system will arrive in the neighborhood on
Friday afternoon, providing widespread mountain snow and valley
rain/snow mix through midday Saturday. Snow accumulations over
area mountain passes will make for hazardous travel Friday evening
through Saturday morning. At worst, valley locations could see a
dusting of snow overnight Friday, however likely confined to only
grassy areas. Otherwise, precipitation amounts are projected to be
High pressure is expected to quickly redevelop over the Northern
Rockies Saturday afternoon and be present through at least Sunday
night. It is conceivable that Sunday afternoon temperatures will
be the warmest of 2014 thus far, with many valleys solidly in the
50s or warmer.
Another storm system has been advertised by model guidance Monday
through midday Tuesday, however consensus among the models appears
to have recently diminished. The ECMWF continues to depict a broad
wave and associated precipitation passing through the region while
the GFS is now washing out the system and absorbing the jet streak
into northwesterly flow aloft. The current GFS solution would
translate to more of an increase in cloudiness and little else. At
worst, this system will be similar to the one anticipated the
upcoming weekend, with mountain snow and valley rain/snow.
High pressure will be present over the Northern Rockies during the
next 24 hours. A resurgence in fog is possible through 12/1800Z
for KGPI and KMSO, limiting visibility at times to less than one
quarter mile. After 12/1800Z, mostly clear skies and light winds
will be present at all Northern Rockies airfields.
MT... DENSE FOG ADVISORY until Noon MDT today Flathead/Mission
Valleys...Kootenai/Cabinet Region...Lower Clark Fork Region.
ID...DENSE FOG ADVISORY until 11 AM PDT this morning
Orofino/Grangeville Region...Southern Clearwater Mountains.
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