Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 270917

Area Forecast Discussion
National Weather Service Missoula MT
317 AM MDT Sun May 27 2018

.DISCUSSION...The cutoff low pressure system that has been parked
over Nevada and Utah for the last several days finally starts to
move east again on Monday ushering in a few days of nice, warmer
weather for the northern Rockies. But that system moving on opens
the door for another trough and associated cold front to move into
the region Wednesday.

The cold front on Wednesday will cause some gusty winds in the
afternoon. Current models have the front moving through central
Idaho and parts of western Montana in the morning, so they won`t
warm up as much and won`t see as much wind. However, from about
Georgetown Lake south and east will see some 20 mph winds
Wednesday afternoon. This is also a very good pattern for some
thunderstorms to develop ahead of the front along the Continental
Divide Wednesday.

Behind the cold front temperatures will be around average for the
end of the week with 10-15 mph winds in the afternoon for many
areas of western Montana, and lighter winds in central Idaho.

Overall, the exiting cutoff low and cold front on Wednesday are a
pattern change that will bring the weather conditions back much
closer to seasonal averages.


Patchy fog in the valleys is possible this morning, particularly
locations that recently received rainfall last night. Otherwise,
VFR conditions are expected. Afternoon showers and thunderstorms
will develop once again over Lemhi County and southwest Montana,
which could begin impacting KSMN and KBTM after 27/2100Z with
gusty winds, brief downpours, lightning, and potentially small
hail. Activity should diminish after 28/0600Z.


MT...Flood Watch until 3 PM MDT this afternoon Flathead/Mission


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