Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 181520
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
920 AM MDT Wed Jul 18 2018

.DISCUSSION...Warm and dry today with passage of a weak dry cold
front later this afternoon. Satellite showing an upper level low
pressure system moving across Washington state this morning which
will continue east into Northern Idaho/Western Montana this
afternoon. The associated cold front will move through the
forecast area allowing for northwesterly winds with gusts up to
25 MPH. Large fires continue across Owyhee, Twin Falls and Gooding
counties with a few of them producing some smoke this morning.
Also seeing smoke and haze in Baker County this morning from fires
in Northeast Oregon. Fires should become more active this
afternoon and produce smoke layers across south-central Idaho. Do
not think they will significantly affect temperatures or
visibility except in close proximity to the fires. Have increased
the wind forecast for today with the frontal passage. Update will
be out shortly.

&&

.AVIATION...VFR in most areas of southwestern Idaho and southeastern
Oregon except in the vicinity of wildfires, including KBKE, where
smoke and haze will reduce visibility to MVFR in the morning.
Northwest surface winds of 10 to 15 kts will clear smoke and improve
visibilities in the afternoon. Winds aloft near 10 KFT MSL: west-
southwest 15-20 kts.

&&

.PREV DISCUSSION...
SHORT TERM...Today through Thursday...Drier air now coming into
our CWA under moderate westerly flow aloft.  Skies will be clear
through Thursday except for smoke in Owyhee and Twin Falls
Counties.  High temperatures today will change little from
yesterday, but Thursday will be a little cooler due to an upper
low in the Queen Charlotte Islands.

LONG TERM...Thursday night through Wednesday...Hot and dry through
the extended period with a ridge of high pressure dominating the
weather pattern across the region. A trough of low pressure will
briefly graze Oregon and Idaho late Friday into Saturday, but will
do little to change the situation. An increase in wind, a slight
moderation in temperatures, and a few thunderstorms near the Nevada
border are anticipated with the trough. By late in the weekend and
early next week high pressure will rebound overhead and continue our
deep summer pattern.

&&

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

&&

$$

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DISCUSSION...JDS
AVIATION.....JB
PREV SHORT TERM...LC
PREV LONG TERM....MC


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