Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 111012

Area Forecast Discussion
National Weather Service Boise ID
312 AM MST Mon Dec 11 2017

.SHORT TERM...Today through Tuesday...Upper ridge remains anchored
over the intermountain NW with a 1040 mb surface high centered
over Ontario Oregon. The widespread stratus and locally dense fog
will persist under this pattern continuing to fill most valleys
under 5k feet. As with the past couple of days, areas in the
central Snake Plain will see the fog/stratus erode some in the
afternoon allowing for a brief period of sun. High temperatures in
the valleys will remain below normal. Mountain valleys and
elevations above 5k feet will continue to see mostly sunny skies
and above normal temperatures through Tuesday.

.LONG TERM...Tuesday night through Sunday...No significant changes
to the long term as the upper ridge remains over the Pacific
Northwest. Weak system rides over this ridge Wednesday but really
does not do anything the the inversion...but would bring abundant
clouds (besides the stratus deck across the lower valleys) to the

The ridge begins to flatten by the end of the week as a weak feature
slides into the Pacific Northwest. This should be enough to scour
out the inversion and bring a threat of rain and snow to mainly
north of Burns Oregon and Boise. Still looks like a more potent
storm moves into the region through the weekend. The moisture
associated with this feature appears to be coming from the areas
south of Japan. The southern portions of the forecast area should be
more of a rain event as snow levels rise 4-5000 feet generally south
of a Burns-Boise line Saturday afternoon and over 6000 feet Sunday
and Monday. Accumulating snow is possible across the west central
mountains of Idaho Saturday Night and into Sunday.


.AVIATION...Stratus and fog throughout the valleys creating MVFR
and localized IFR conditions. Surface winds, light and variable.
Winds aloft to 10 KFT MSL, variable 5-15 kts.


.AIR STAGNATION...Inversion remains in place and will persist
with little change into Friday. The best chance for breaking the
inversion comes with a system late Friday.





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