Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 170935

Area Forecast Discussion
National Weather Service Missoula MT
335 AM MDT Tue Sep 17 2019

.DISCUSSION...Rainfall is meandering northward this morning out of
southern Idaho. It will continue this south-to-north trek,
spreading light rainfall across most of the Northern Rockies
region through later this afternoon. There will be a brief period
later today into tonight where rain will cease, but the next round
of precipitation will be hot on its heels.

By Wednesday morning, rain will once again move into our area.
This time, rain will enter from the west, spreading across north
central Idaho first before entering western Montana by Wednesday
afternoon. Isolated thunderstorms will also be possible during
this time, though few impacts are expected. Rain will linger
overnight and through the day as well on Thursday. We`re not
expecting an "all day soaker" by any means, but moreso periodic
rain showers interspersed with drier breaks. This makes
forecasting placement and timing of rain rather difficult, so be
prepared for highly changeable conditions during this time.

Plan on cool temperatures (highs in the 60s) and occasional
showers continuing Friday through early next week. There will be dry
periods, but forecast models have been struggling with
precipitation timing. The best chance for drier weather still
appears be later Saturday through much of Sunday.


.AVIATION...Rainfall has been very slow to move northward out of
southern Idaho and into western Montana. As such, the heaviest
rainfall is likely to occur later this morning, potentially after
sunrise, for terminals KSMN, KBTM, and KMSO. KGPI stands to
receive the least amount of precip, which will likely begin around
or after 17/1800Z. A break in the rain will occur this afternoon,
lasting through roughly 18/0600Z before the next round occurs.



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