Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 271540

Area Forecast Discussion
National Weather Service Boise ID
940 AM MDT TUE SEP 27 2016

.DISCUSSION...Upper level ridge will be over the area today for
clear skies, light winds, and above normal temperatures. Forecast
is on track for no updates.


.AVIATION...VFR under clear skies. Surface winds will be light
and variable at 10 kts or less. Expect light westerly winds aloft
at 10 kts or less.


SHORT TERM...Today through Wednesday...Temperatures will remain
about 10 to 12 degrees above normal today and Wednesday
underneath an upper level ridge. The temperatures should reach
the mid 80s today and then the upper 80s on Wednesday. The upper
level ridge begins to weaken Today and shift eastward Wednesday in
response to the next upper level trough for the end of week.

LONG TERM...Wednesday night through Tuesday...As the upper level
ridge transitions east through Thursday, a southerly flow will
strengthen which will aid monsoon moisture in its journey
northward out of the Desert Southwest. Showers and thunderstorms
will be possible with this moisture surge mainly over the central
Idaho mountains and over the Magic Valley and south through
Thursday night. The ridge and monsoon moisture will be kicked east
on Friday as a deep upper level trough descends out of the Gulf of
Alaska and into the Pacific Northwest. Will see a cold frontal
passage on Friday associated with the trough, which will bring a
5-10 degree temperature drop from the previous day and a round of
showers and thunderstorms to the region. Best chance of
precipitation is expected over the higher terrain. Unsettled
weather and cooling temperatures are expected into the beginning
of next week with the most dramatic temperature drop forecast for
Friday into Saturday with a 9-12 degree temperature drop.
Temperatures will be about 10 degrees below normal by Monday.





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