Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 240255
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
855 PM MDT Wed Aug 23 2017

.DISCUSSION...Thunderstorms in SW Idaho produced several outflow
boundaries. A couple boundaries pushed through the Treasure Valley
producing wind gusts of 30-40 mph. Activity is diminishing
somewhat in SW Idaho, although it has been increasing in SE
Oregon over the past couple hours. Showers and thunderstorms are
expected to diminish across the south but may linger through the
night across the north. Focus for convection on Thursday will be
along a front as it approaches from the northwest, reaching a
Baker City to McCall position by late afternoon. No changes at
this time.

&&

.AVIATION...VFR. SCT-BKN mid and high level clouds. Smoke layers.
Isolated thunderstorms mainly over the higher terrain. Surface
winds variable 5-15kt except gusts to 40kt possible in the
vicinity of thunderstorms. Winds aloft at 10kft MSL west 5-15kt.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Friday...A weak upper wave will lift
through the area overnight, keeping a slight chance of showers and
thunderstorms over the higher terrain of east-central Oregon and
the west-central ID mountains through early Thursday morning.
Showers and storms and could produce brief heavy rain and gusty
winds to 40 mph through the early evening. Southwest flow
increases Thursday with a mid-level front stretching from east-
central Oregon into southwest MT acting as the focus for shower
and thunderstorm development. Drier air south of the front will
keep southeast Oregon and much of southwest Idaho dry. The front
weakens Thursday night into Friday laving a slight chance of
showers/storms across higher terrain of s-central ID. Temperatures
will run near normal through Friday. Also, expect the southwest
flow and precipitation to improve the haze conditions in the short
term.

LONG TERM...Friday night through Wednesday...Smoky conditions are
expected into Saturday as winds aloft bring smoke from central
Oregon under weak and dry westerly flow. Strong upper level ridging
is expected to build across the West on Sunday, bringing above
normal temperatures and dry conditions through Monday. Oregon
wildfire smoke under the ridge will be carried toward the north,
with smoky conditions lingering in the central ID mountains.
Temperatures expected to be around 10-15 degrees above normal under
this ridge but just under records. By Monday, monsoon moisture could
come into play, increasing clouds and thunderstorm chances through
Wednesday.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Red Flag Warning until 3 AM MDT Thursday IDZ400>403-421-423-426.
OR...Red Flag Warning until 3 AM MDT /2 AM PDT/ Thursday
     ORZ636-637-646.

&&

$$

www.weather.gov/Boise
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www.twitter.com/NWSBoise

DISCUSSION...BW
AVIATION.....JT
PREV SHORT TERM...DG
PREV LONG TERM....KA


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