Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 272038

Area Forecast Discussion
National Weather Service Boise ID
238 PM MDT Tue Jun 27 2017

.SHORT TERM...Tonight through Thursday...A weak frontal boundary
across the Wallowa Mountains toward the north central Idaho
mountains will continue to trigger isolated thunderstorms this
afternoon mainly northeast of McCall. This boundary will slowly
move south late this afternoon and overnight. Isolated showers
are expected mainly across the higher terrain of the Owyhee and
Boise Mountains as the frontal boundary moves south. Drier and
slightly cooler northwest flow arrives on Wednesday, pushing the
moisture and instability toward the southeast. A slight chance of
afternoon thunderstorms on Wednesday afternoon across the higher
terrain south of the Snake Plain, and the central Idaho mountains.
Dry conditions expected on Thursday as upper level ridging begins
to build into the Pacific NW.

.LONG TERM...Thursday night through Tuesday...Upper level trough
will exit Thursday night as a ridge builds in over the region.
Temperatures will increase slightly each day as the ridge deepens and
a thermal trough moves through. The ridge will not reach its maximum
potential however as a shortwave trough moves across the Canadian
border Saturday suppressing the ridge`s growth. There is a slight
chance of afternoon showers/thunderstorms Saturday night with the
trough passage from the Wallowa Mountains east through the West
Central Mountains. The ridge will rebuild in its wake come Sunday
with temperatures continuing their climb. Upper level flow turns
southwesterly Monday as a trough digs into the Pacific Northwest,
bringing temperatures down Tuesday as it moves into the area.
Temperatures will be 3-8 degrees above normal through the period.


.AVIATION...VFR. Dry and mostly clear skies across most of the
region with isolated thunderstorms possible over the West Central
Mountains. Surface winds, west-northwest 10-20 kts with gusts 25-35
kts in and around thunderstorms. Winds diminish overnight. Winds
aloft to 10k feet MSL, westerly 15-25 kts.





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