FXUS65 KBOI 110336
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.
.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.
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.
PREV SHORT TERM...KB
PREV LONG TERM....JC/WH