Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 201349
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
749 AM MDT Wed Sep 20 2017

.UPDATE...Issued a winter weather advisory for the Butte/Blackfoot
region above 6000 feet.


&&

.DISCUSSION...A band of precipitation is causing accumulating snow
on roadways around Georgetown lake and is heading towards
MacDonald pass. This snow accumulation will cause a period of
difficult travel conditions through the morning hours.


&&

.AVIATION...

Periodically lowered ceiling and visibility will be likely for all
area terminals through the day today as precipitation lingers.
Gusty west winds are likely in the afternoon and evening,
especially in areas of heavier showers. Expect more of the same
going into Thursday.



&&

.PREV DISCUSSION... /ISSUED 323 AM MDT Wed Sep 20 2017/

..Snow down to 5000 feet through this morning...

DISCUSSION...Showers have been widespread across north central
Idaho and much of western Montana this morning. Mountain passes
have seen persistent precipitation through the night, with a light
coating of snow sticking to road surfaces over Lolo and Lost Trail
passes, specifically. Precipitation will continue through the day
into tonight, as the region remains under a dominant trough
pattern. Those in the back country above roughly 5000 feet should
expect cold and raw conditions with snow possible at times.

In fact, as a result of this pattern persisting through the end of
the week, expect wet, cool, and dreary conditions to last through
Friday, especially across southwest Montana. With snow levels
remaining around 5000 feet, Friday could be a snowy one for
locations like the mountains of the Butte/Blackfoot region,
Georgetown Lake, and south over Lost Trail Pass. Several inches of
new snow could impact these travel corridors through the day
Friday, so if you have plans to travel, take heed of the potential
for inclement conditions to occur.

Brief high pressure will help dry things out somewhat for the
weekend, with a gradual warming trend through the early part of
next week.

AVIATION...

Periodically lowered ceiling and visibility will be likely for all
area terminals through the day today as precipitation lingers.
Gusty west winds are likely in the afternoon and evening,
especially in areas of heavier showers. Expect more of the same
going into Thursday.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Winter Weather Advisory until 10 AM MDT this morning ABOVE 6000
     FEET for the Butte/Blackfoot Region.

     Winter Weather Advisory until 10 AM MDT this morning
     Bitterroot/Sapphire Mountains.

ID...None.
&&

$$


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