Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 240245

Area Forecast Discussion
National Weather Service Boise ID
845 PM MDT Sat Sep 23 2017

.DISCUSSION...Dry northerly flow aloft continues over the area
through tomorrow. Temps tonight will be cold, especially in parts
of the western Magic Valley, but frost should be minimal due to
dry air and brief period of cold temps. No changes at this time.


.AVIATION...VFR. Continued clearing through the night with mostly
clear skies for Sunday. Surface winds, light and variable
overnight and into early morning then mostly northerly 10-15 kts
with gusts 20-25 kts within the Upper Treasure and Magic Valley.
Winds aloft to 10k feet MSL, north 10-15 kts.


SHORT TERM...Tonight through Monday...The warming and drying
trend will continue with each day warming a few degrees as the
upper low continues to move to the east and an upper ridge builds
into the Pacific Northwest. Most low valley locations will reach
into the 60s over the next two days, while mountain valleys will
reach into the 50s. However, before the warming trend takes hold,
many valley locations will drop to near-freezing temperatures just
before daybreak; this will be especially true tonight as skies
become mostly clear. This may lead to areas of patchy fog, but
opted not to include this feature in the forecast as conditions
will be generally drier than last night. Winds are expected to
increase Sunday afternoon as a north-northwest flow aloft mixes
down to the surface. Areas near Mountain Home, south and east
will see gusts up to 20 mph. By Monday, winds will calm and cloud
cover will increase as moisture embedded in the flow aloft spreads
across the region.

LONG TERM...Monday night through Saturday...Persistent high pressure
over the area will keep generally dry conditions through the work
week. A weak wave may impact the West Central Mountains of Idaho
Monday night, resulting a in a few higher terrain showers, but
confidence in this development is not strong. Another weak wave
may move through the northern portion of the forecast area early
Saturday, but impacts look minimal with no showers expected.
Temperatures will continue to warm through the period, with near-
normal values of low 70s expected in the valleys by Tuesday and
then warming to the mid to upper-70s by Thursday.





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