Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 250935

Area Forecast Discussion
National Weather Service Boise ID
335 AM MDT Tue Apr 25 2017

.SHORT TERM...Today through Wednesday...Showers continue to move
through the central Idaho this morning. Satellite is demonstrating
drier air, associated with a diving shortwave, moving into
eastern Oregon which will help to keep shower activity minimal
through the afternoon. A few showers across the West- Central and
Boise Mountains. Clearing expected with the drier air, allowing
temperatures to warm slightly. The moisture reprieve will be
brief, with the next Pacific system moving inland and into eastern
Oregon by late Tuesday evening. A stronger secondary push of
moisture will move inland after midnight, creating widespread
showers by early Wednesday morning. Models in good agreement that the
upcoming system will be rather potent in regards to moisture with
around a half inch possible in the valleys and close to 1 inch in
the mountains by Wednesday evening. Snow levels remain between
5000 and 6000 ft MSL, keeping snow and a rain-snow mix possible
through Wednesday. Colder temperatures expected due to the passage
of a cold front. Additionally, passage of this front will aid in
creating instability around the OR/ID border, with some
thunderstorms possible. Showers and thunderstorms will then
continue through Wednesday afternoon.

.LONG TERM...Wednesday night through Monday...As Wednesday`s
system exits the region, continued moisture within a northwesterly
flow aloft will prevail, though the focus of precipitation will
generally be over the higher terrain. Thicknesses drop across the
region Thursday and into Friday for temperatures 10-15 degrees below
normal and a slight chance of morning snow down to valley floors.
QPF amounts will be low however, and no accumulation is expected. A
shortwave ridge will push into the region late Friday, bringing a
brief period of drying and warming conditions through late Sunday
before the ridge breaks down and a moist northwest flow aloft sets
in once again. Temperatures will be within 5-10 degrees of normal
beginning Saturday through the end of the period with low 60s
expected across the Snake River Plain over the weekend.


.AVIATION...Generally VFR-MVFR in showers ending around 25/12Z.
Mountains will remain obscured through the morning. Drier and
clearer after 25/12Z, except for a chance of continued showers over
the Idaho Central Mountains. Showers will increase in coverage after
26/06Z. Surface winds: generally west to northwest 10-20 kts. Gusts
20-30 kts in Mountain Home, south and east, through to the Magic
Valley. Winds aloft near 10KFT MSL: northwest 20-30 kts, diminishing
to 10-15 kts by 25/15Z, becoming west 10-20 kts by 25/21Z.





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