Area Forecast Discussion


386 
FXUS65 KBOI 110336
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
836 PM MST Sun Dec 10 2017
.DISCUSSION...Very little change is expected through Monday with 
the inversion and resultant fog/stratus which extends across most
of the lower elevations of southeast Oregon and southwest Idaho. 
No updates.
&&
.AVIATION...Widespread stratus and patchy fog in the valleys 
through Monday, with widespread MVFR ceilings and local IFR/LIFR 
conditions. Surface winds light and variable. Winds aloft at 10 
KFT MSL variable 5-15 kts.
&&
.AIR STAGNATION...Little change is expected with the inversion
for the next several days. Winds will remain light through the 
inversion layer for continued stagnant conditions.
&&
.PREV DISCUSSION...
SHORT TERM...Tonight through Tuesday...Continued ridge with 
inversion will keep low stratus/fog around the area today and 
Monday. Models continue to show a weak disturbance moving north of
the area along the ridge for Tuesday. This will help to briefly 
flatten the ridge and provide a brief reduction in low stratus/fog
presence, mainly across the northern third of the forecast area. 
Otherwise, cool and dry conditions will remain with light wind. 
LONG TERM...Tuesday night through Sunday...Persistent forecast 
through Thursday afternoon for the CWA with the upper level ridge 
still camped out over the Pacific Northwest. As this ridge 
retreats further SW, a weak disturbance is able to drop down and 
make its way into the area Friday morning. This first disturbance 
will be quick moving with precipitation isolated to northern 
portions of the CWA. Temperatures and snow levels are favorable 
with the onset of this disturbance to see a wintry mix for 
valleys. A more potent storm system makes its presence known 
Saturday afternoon, however, we sit in the warm sector through the
end of the forecast period meaning precipitation will be in the 
form of rain with snow above 4000 feet MSL. 
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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DISCUSSION...BW
AVIATION.....JT
AIR STAGNATION...BW
PREV SHORT TERM...KB
PREV LONG TERM....JC/WH