Area Forecast Discussion
Issued by NWS Boise, ID

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
000
FXUS65 KBOI 280233
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
833 PM MDT Mon Mar 27 2017

.DISCUSSION...Showers have mostly diminished across the region
this evening as the upper level trough exited. An Upper level
ridge will begin to build in early Tuesday for dry conditions into
early Wednesday. Sheltered valleys could see patch fog develop
Tuesday morning. Next upper level trough still on track for late
Wednesday through Thursday. This system is expected to bring
significant precipitation to the region and will likely cause more
river and small stream flooding later this week. No updates need
at this time.

&&

.AVIATION...Mostly VFR with showers dissipating rapidly then mostly
clear on Tuesday. LIFR/IFR fog possible in mountain valleys from
28/10Z to 28/16Z. Surface winds: generally west/northwest around 10
kts with gusts to 20 kts in the Magic Valley. Winds aloft near 10
KFT MSL: Northwest 15 - 20 kts.

&&

.HYDROLOGY...Flood advisory continues until Tuesday afternoon in
Camas and northern Elmore Counties with flow still high on the
Camas Creek. The Boise River at Glenwood Bridge in Boise will
remain in minor flood. The Snake River at Weiser dropped below
flood stage this afternoon so the warning was cancelled. It will
remain just below flood stage through Thursday, then is forecast
to rise more significantly Friday and especially Saturday. This
and other rivers like the Malheur River near Vale will continued
to be monitored for flood potential later this week.

&&

.PREV DISCUSSION...
SHORT TERM...Scattered light rain and snow showers in the higher
terrain will end by sunset.  Clearing and colder tonight.  Patchy
valley fog late tonight and Tuesday morning.  High pressure
surface and aloft will bring dry, mild weather Tuesday through
Wednesday morning.  On Wednesday a Pacific frontal system will begin
rain in Baker County, spreading southeastward during the day.
By late afternoon the leading edge will be Challis, ID - Ontario,
OR - Steens Mountain, OR.  Low temps tonight will be 30 to 35 in
the lower valleys, 20s in the mountains.  Highs Tuesday in the
lower to mid 50s in the valleys, 40s to lower 50s in the mountains.
Tuesday night will be slightly warmer as clouds increase especially
in Baker County.  Wednesday will be about 10 degrees warmer than
Tuesday in southern areas, but about the same as Tuesday in the
cloudy north.  Light to moderate west winds Tuesday, light southeast
winds Wednesday.

LONG TERM...Wednesday night through Monday...A very moist
Southwesterly flow aloft will take aim on the region Wednesday night
through Thursday ahead of an approaching PacNW trough. Snow levels
during the period of heaviest precip (Wednesday night through
Thursday morning) will average 8500 feet, thus snowfall will be
limited to the mountain peaks. QPF amounts look impressive, with
total amounts of up to 0.50 inches in the valleys and up to an inch
in the mountains. Locally higher amounts are possible. The PacNW
trough will become a closed upper low in Nevada on Thursday, or near
the ID/OR/NV triple point depending on model solution. The track of
the low will determine the amount and extent of wrap-around QPF
Thursday night through Friday. Snow levels will fall to around 4000
feet MSL Thursday night with accumulating snows likely at higher
elevations along the ID/NV border. Windy conditions will develop
Thursday afternoon which will persist into Friday. The upper low
will shift well to our East as an upper ridge builds into the area
on Saturday for dry weather, mild temperatures, and light winds.
Next Pacific system brings a chance of showers and cooler
temperatures Sunday and Monday.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.

&&

$$

www.weather.gov/Boise
www.facebook.com/NWSBoise
www.twitter.com/NWSBoise

DISCUSSION...JDS
AVIATION.....EP
HYDROLOGY...JDS
PREV SHORT TERM...LC
PREV LONG TERM....BW/DD



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.