Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 252020
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
220 PM MDT Thu May 25 2017

.DISCUSSION...A broad trough remains over the area today and
Friday, allowing some afternoon instability and the chance for
isolated thunderstorms and showers over the mountains in the
afternoons. Then a ridge begins to build over the region for much
of the weekend, causing a gentle warm up into early next week.
Overall, expect very pleasant weather for Memorial Day weekend in
Central Idaho and Western Montana. Some isolated showers and
thunderstorms may persist under the ridge, mainly along the
Continental Divide this weekend.

For the holiday weekend, our main concern is the threat that
rising rivers pose. As recreationalists get outside this weekend,
rivers and streams will be running high, fast, and cold due to
increased run off from high elevation snow melt. Rivers in general
will be climbing slowly with the slow warm up, and some rivers
may reach flood stage again next week. Right now the Salmon River
near Salmon, ID and the Flathead River from Columbia Falls to
Flathead Lake are the biggest concerns.

Mid to late next week models start to diverge as usual, but in
general they are signaling a break down of the ridge with
thunderstorms, a weak cold front, and cooler but seasonable
temperatures.


&&

.AVIATION...Some afternoon clouds and showers will occur today
under the influence of a broad trough that moved over the region
yesterday. The trough has been very dry, so few other impacts are
expected through this evening.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&

$$


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