Area Forecast Discussion
Issued by NWS Missoula, MT

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

000
FXUS65 KMSO 182047
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
247 PM MDT Fri Aug 18 2017

.DISCUSSION...A dry cold front is approaching western Montana and
central Idaho this afternoon. Ahead of the front, dry and breezy
conditions will develop late this afternoon into the evening as
high pressure begins to flatten. The front will move through
tonight, likely maintaining breezy conditions, especially in the
higher terrain, into Saturday morning. This will be a critical
period for area wildfires due to the dry and breezy conditions.

The cold front will stall across southwest Montana for Saturday.
Cooler temperatures are anticipated for most locations behind the
front, though breezy winds will continue, especially in the
vicinity of the stalled front.

The Northern Rockies will be under zonal (westerly) flow aloft
Sunday into Monday keeping temperatures slightly cooler then the
past several days. The models are indicating a weak disturbance
moving through this flow pattern late Sunday night into Monday
morning. This feature does have the potential of bringing partly
to mostly cloudy conditions to the Northern Rockies during the
Solar Eclipse. Moderate confidence on the exact timing and the
amount of moisture associated with the disturbance.

A ridge of high pressure rebounds over the Northern Rockies
Tuesday into Wednesday causing temperatures to warm. The ridge
axis shifts to the east by Thursday, putting the Northern Rockies
in a southwesterly flow pattern. This pattern is conducive to
increased convection potential. These storms could be on the dry
side due to how dry the low levels have been for the past week.
The models are hinting at another dry cold front moving through
the latter part of the week, but details are limited at this time.

&&

.AVIATION...Breezy westerly winds are anticipated to mix down to
valley floors late this afternoon and through the evening. These
winds will help dissipate wildfire smoke from affected terminals.
The winds will diminish in the late evening which could allow the
smoke to settle into area valleys once again. KMSO continues to be
the most impacted terminal for area smoke.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Red Flag Warning until 9 PM MDT Saturday Deerlodge/West
     Beaverhead.

     Red Flag Warning until 6 AM MDT Saturday Bitterroot...East
     Lolo...Flathead/Glacier Park...Salish and Kootenai
     Reservation...West Lolo.

     Red Flag Warning until 9 PM MDT this evening Kootenai.

     Red Flag Warning from noon to 9 PM MDT Saturday East Beaverhead.

ID...None

&&

$$



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.