Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 180236

Area Forecast Discussion
National Weather Service Boise ID
836 PM MDT Mon Jun 17 2019

.DISCUSSION...Showers and thunderstorms have been occurring around
the periphery of the CWA for the past 6 hours or so, with isolated
storms occurring within. As of 8:30 pm MDT, all storms had moved
out of the area and/or weakened. We do not expect much activity
the remainder of tonight, but cannot rule out the possibility
completely. The current forecast has this handled well, and no
changes will be made at this time.


.AVIATION...VFR. Isolated thunderstorms dissipating shortly after
sunset. Clear and dry on Wednesday. Surface winds: generally
west/northwest 5-10 kts, with occasional gusts to 25 kts. Winds
calming overnight, then gusts 20-30 kts Wednesday afternoon. Winds
aloft near 10 KFT MSL: West/northwest 5-10 kts.


SHORT TERM...Tonight through Wednesday...Isolated thunderstorms
in the Wallowa Mountains of Oregon and in the West Central and
Owyhee Mountains of Idaho will diminish around sunset. Expect
clear skies and light winds overnight. The weather tomorrow will
be very similar to what occurred today with cumulus clouds
developing over the mountains in the afternoon. Isolated
thunderstorms are possible again on Tuesday afternoon in the
mountains with sunny and warm conditions continuing in valley
locations. A dry cold front will approach from the northwest on
Wednesday. Breezy northwest winds will increase ahead of the front
on Wednesday afternoon, especially in the Snake River Plain.
Temperatures will still be near seasonal normals ahead of the
front on Wednesday...then falling sharply behind the front on
Wednesday night.

LONG TERM...Wednesday night through Monday...An unseasonably cool
upper level trough over British Columbia will begin to move south
into the Pacific NW on Thursday. Temperatures will lower to around
15-20 degrees below normal on Thursday with breezy conditions during
the afternoon. Showers with this system will generally remain across
the high terrain north of Baker City, OR to McCall, ID through
Friday. A secondary trough begins to form over the great Basin on
Saturday, which will increase chances of precipitation, mainly over
the mountains during the afternoon. Brief warming expected on Sunday
and Monday before another trough begins to move down the West Coast
on Monday.  Below normal temperatures are expected through the
extended period.





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