Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 240938

Area Forecast Discussion
National Weather Service Boise ID
238 AM MST Tue Jan 24 2017

.SHORT TERM...Today through Wednesday...The large upper level low
that brought snow to much of the southern half of the area
yesterday is now off to our east, but still bringing light snow to
parts of the Western Magic Valley and to the mountains of
southwest and central Idaho. We expect light snow to continue in
these areas today, with around an inch of accumulation possible in
the Western Magic Valley. Temps today will be similar to, or a
couple degrees cooler than, yesterday. Tonight there will be more
dry air, and therefore slightly cooler temps than this present
morning. For Wednesday, expect around 5 degrees of cooling
compared to today. The chance for light snow decreases in the east
tonight and tomorrow, but increases slightly in the west owing to
a new trough axis that moves in as it weakens.

.LONG TERM...Wednesday night through Monday...A weak trough will
drop south over the forecast area Wednesday night and Thursday.
This system will bring increasing clouds along with a slight
chance of showers. Models do not have a good handle on this system
and change from model run to model run as to where precipitation
will fall. Current model trend will be for the precipitation to be
light and mainly over southern section of Harney and Malheur
counties in Oregon and areas south of the Snake River Plain, but
will leave slight chance pops over the central mountains of Idaho.
Upper level ridge will develop over the area Friday and Saturday
and will remain over the region into early next week. As the ridge
develops will see strengthening of valley inversion. Models
hinting at a weak disturbance that will ride over the top of the
ridge Sunday night and Monday, but for now looks like any
precipitation with this system will remain north of the forecast
area. Temperatures through the extended will remain well below


.AVIATION...Areas of IFR/LIFR conditions in low stratus, snow and
blowing snow in the Snake River Plain east of KMUO to KJER/KTWF
and south to the Nevada border this morning, with improving
conditions this afternoon. Otherwise VFR with mid level ceilings.
Surface winds westerly 5-15 knots with the strongest winds in the
Snake River Plain east of KMUO. Winds aloft northwest to north
20-30 knots up through 10K feet MSL.





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