Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 270937

Area Forecast Discussion
National Weather Service Missoula MT
337 AM MDT Sat May 27 2017

.DISCUSSION...Even though a ridge of high pressure will be
building just west of the Northern Rockies, the area will be under
light northerly flow. This flow will be conducive to
afternoon/evening showers and possible thunderstorms. Temperatures
should warm to around 5 degrees above normal today. The ridge
continues to strengthen through Sunday but again the area will be
under light northwesterly flow with very subtle features moving
through. These features should allow for a slight increase in
showers and thunderstorm activity on Sunday afternoon/evening as
temperatures climb to 10 degrees above normal.

Warm temperatures will continue early next week under a ridge of
high pressure. A few showers and thunderstorms will be possible
over the terrain but most areas will remain dry. The ridge will
begin to breakdown mid week allowing weather disturbances and mid
level moisture to work together for a threat of thunderstorms
Wednesday afternoon through the end of the week. Forecast models
vary considerably on how much moisture will be drawn into the
region which will greatly impact thunderstorm coverage and
intensity but the flow pattern is favorable for a few strong

Area rivers and streams will continue to run high and fast this
weekend through next week. Use caution when venturing near swift
moving water.


.AVIATION...Light northerly flow will persist over the Northern
Rockies today as a ridge of high pressure strengthens to the west
of the area. A few showers and possible thunderstorm will develop
this afternoon and evening as the atmosphere destabilizes. These
showers will be capable of producing gusty and erratics winds.
Also if a shower does go over a terminal, expect MVFR conditions
for a period of time.



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