Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 190936

Area Forecast Discussion
National Weather Service Missoula MT
336 AM MDT Sat Aug 19 2017

.DISCUSSION...The dry cold front that brought gusty westerly winds
to much of western Montana and north-central Idaho Friday, is
expected to linger over southwestern and west central Montana
through the day today. The frontal boundary will bring gusty winds
to portions the Beaverhead/Deerlodge National Forest in
southwestern Montana, along with very dry conditions. Due to this,
Red Flag Warnings will go into effect at noon today, through 9PM
this evening. Gusty winds will also return to portions of the
Bitterroot and Lolo National Forests this afternoon, so Red Flag
Warnings have now been issued for these areas, also going into
effect at noon today, through 9PM. Near critical fire weather
concerns will remain through the rest of the weekend, with a weak
shortwave moving through the region Sunday, with dry conditions

The Northern Rockies will transition to a more zonal (westerly)
flow Monday through mid week. This will allow for more seasonable,
if not slightly below normal temperatures for the first part of
the week. This flow will also produce partly to mostly cloudy
skies for a period of time Monday. So this could impact the
viewing of the solar eclipse, though there is low confidence on
timing of any cloud cover obscuring the eclipse.

A brief ridge of high pressure will build over the region
Wednesday, allowing for above normal temperatures to return.
However, it will be short lived with a strong low pressure moving
on shore of the Pacific NW by Thursday. This will allow for a
ridge breakdown and the development of a southwesterly flow. This
flow will be conducive for at least isolated showers and
thunderstorms to develop. These storms could be more on the dry
side, as there will be little moisture in the low levels.

There is the potential for another mostly dry cold frontal passage
by next weekend, though confidence in the timing and details is
low at this time.


.AVIATION...Winds will become breezy once again today for all air
terminals between 19/1800Z and 20/0200Z. Local wildfire smoke
will be a persistant impact once again for most terminals, but the
worst impacts from wildfire smoke will be KMSO and KBTM. Low
visibility from smoke is expected after 20/0200Z through the day
Sunday as a result of more stable conditions.


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

     Red Flag Warning from noon today to 9 PM MDT this evening
     Bitterroot...East Lolo.

     Red Flag Warning until 9 PM MDT this evening Deerlodge/West

     Red Flag Warning from noon today to 9 PM MDT this evening East


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