Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 112000

Area Forecast Discussion
National Weather Service Missoula MT
200 PM MDT Tue Aug 11 2020

.DISCUSSION... Clear skies and warm temperatures will continue
again today across the Northern Rockies. Later this afternoon or
evening, a closed upper-level system of low pressure will slowly
traverse across the British Columbia-Alberta border in Canada. As
this trough digs south and moves east, a dry cold front will swing
through western Montana and central Idaho this evening. The front
will bring cooler, drier air and high winds. Dry and windy
conditions will stick around through Wednesday, while high
temperatures drop about 10 degrees from today. Due to the increase
in wind and low relative humidity, critical fire weather
conditions will exist. A Red Flag Warning is in effect from this
afternoon through Wednesday evening for southwest Montana, where
relative humidity will drop down into the lower teens. On
Thursday, high winds will continue as a strong jet streak aloft
dips down into the Northern Rockies from the northwest. Elevated
wind speeds will persist through Friday as we gradually return to
more seasonable temperatures under westerly flow aloft.

By Sunday, another ridge builds over the Northern Rockies as a
Four Corners high pressure system strengthens well to our south.
Temperatures will be above average starting on Sunday and lasting
well into next week.


.AVIATION... Clear skies continue today and Wednesday. Winds will
pick up this afternoon at all terminals by about 11/2100Z with
gusts to 25 knots possible. Winds will subside this evening and
pick up again Wednesday afternoon.


MT...Red Flag Warning until 9 PM MDT Wednesday Deerlodge/West
     Beaverhead...East Beaverhead.


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