Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 050937

Area Forecast Discussion
National Weather Service Missoula MT
337 AM MDT MON OCT 5 2015

.DISCUSSION...Clear skies and light winds have allowed
temperatures to drop quite fast this morning for some valleys in
western Montana and central Idaho. Temperatures are expected to be
a few degrees below freezing in many valleys of western Montana by
sunrise. Therefore, the freeze warning for the Missoula/Bitterroot
valleys will continue until 9am this morning.

A warming and drying trend will begin today as a ridge of high
pressure builds over the region. Temperatures are expected to run
5-10 degrees above normal for this time of the year for most. The
ridge will begin to weaken Wednesday and Thursday as a weak
impulse of energy tries to make its way through the ridge. Not a
lot of moisture is expected, though an increase in clouds and
slightly cooler temperatures will occur. Some light showers may be
possible in central Idaho and southwestern Montana.

The ridge of high pressure will build back over the Northern
Rockies Friday and through the first part of the weekend.
Temperatures could be as warm as 10-15 degrees normal for some,
with highs in the mid to upper 70s.

The unseasonable warm temperatures won`t likely last long. Some
forecast models have a fairly strong system impacting the region
as early as Sunday morning. This system could bring widespread
showers and cooler temperatures to most locations of western
Montana and central Idaho. A strong jet stream will also accompany
this system that has the potential to bring gusty winds,
especially to the higher terrain if all this comes to fruition.


.AVIATION...High pressure will continue to move into north central
Idaho and western Montana today. Model cross sections show that
winds should be fairly light through today with mostly clear
skies. Valley temperatures will again become fairly cold tonight
as valley inversions develop.


MT...Freeze Warning until 9 AM MDT this morning Missoula/Bitterroot


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