Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 200935

Area Forecast Discussion
National Weather Service Missoula MT
335 AM MDT Tue Apr 20 2021

.DISCUSSION...A ridge is building over the region today and
Wednesday. It is bringing mostly clear skies and some drier air
with it. So while it`s very cold this morning, the daytime high
temperatures will be rising today and tomorrow. Wednesday looks to
be the warmest day of the week with temperatures in the low 60s in
western Montana and low 70s in central Idaho.

Thursday another cold front arrives. It looks similar to the last
one, but not as strong. East winds will once again increase
Thursday with some precipitation. Only rain is expected in the
valleys and some snow in the mountains. The Continental Divide
from about Roger`s Pass north could receive several inches of
snow, but snow amounts drop off quickly further west and at lower

Next weekend and early next week the overall pattern changes. The
persistent ridge over the Pacific Coast will break down with more
troughing in that region. That will set the northern Rockies up
for southwest flow. The southwest flow coming in from the ocean
typically carries more moisture with it, and it`s also a good
pattern for thunderstorms. Models really don`t agree yet on a good
time for thunderstorms, but we`re likely to see some in central
Idaho next weekend or early next week. Overall, the change in the
flow should bring the region into a wetter regime so we can start
making up for the dry start to this Spring.


.AVIATION...VFR conditions are expected for the next few days as a
ridge builds over the region. East winds, which are unusual for
this time of year will continue through most of the day, though
they are expected to be light.



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