Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 191615
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
1015 AM MDT Sat Aug 19 2017

.DISCUSSION...Clear skies and breezy conditions expected today and
tonight under a dry westerly flow. Smoke layers aloft will
continue. No updates to the forecast are needed at this time.

&&

.AVIATION...VFR through Monday. Increasing smoke layers will produce
slight reductions in visibility across southeast Oregon and
southwest Idaho. Surface winds will be northwest 10 to 20kts across
open terrain during the day, becoming light at night. Winds aloft
through 10k feet MSL will be west-northwest 10-20kts.

&&

.PREV DISCUSSION...
SHORT TERM...Today through Sunday...A dry west-northwest flow
aloft will continue through the weekend for mostly clear skies.
Temperatures will trend slightly cooler (down a couple degrees),
but will remain near normal. Winds will be generally northwest up
to 10 mph with local afternoon-evening gusts to 20 mph.

LONG TERM...Sunday night through Saturday...The long term
forecast continues to remain active. Monday is the least active of
these days as a short wave passes through which is just enough to
prevent the monsoonal moisture that was forecast earlier in the
week from making its way into our southern zones. The main player
for the long term is an upper level low that is off the British
Columbia coastline Monday afternoon and drops southward through
the forecast period. Tuesday afternoon and into the evening is
when our area first starts to feel the effects from this system.
Monsoonal moisture begins to press northward hitting our southern
zones during the late evening as this system continues to track
onshore. By Wednesday afternoon the frontal boundary is just off
the Pacific Northwest coastline. By early Thursday morning it hits
our CWA with precipitation increasing from west to east. Fairly
good alignment on the models with passage through the CWA sometime
Thursday. Some lingering precipitation remains through early
weekend for SW Idaho. Temperatures are above normal through
frontal passage on Thursday then drop below normal before climbing
back up above by Saturday.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.

&&

$$

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DISCUSSION...EP
AVIATION.....DG
PREV SHORT TERM...BW
PREV LONG TERM....JC



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