Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 251523

Area Forecast Discussion
National Weather Service Boise ID
923 AM MDT THU AUG 25 2016

.DISCUSSION...Current forecast on track with no updates expected.
Axis of a weak upper level trough is over the forecast area today
and will continue to sink to the south through this evening.
Models indicating a slight chance of precipitation along the
eastern border of the forecast area, but with little to no
activity in that area yesterday do not expect there will be
anything today. Forecast does have a mention of isolated afternoon
and evening showers over eastern Valley and Boise Counties and
water vapor imagery is showing some moisture, so will leave the
forecast for now but may take out any mention of precipitation for
this evening with the issuance of the afternoon forecast package.
Otherwise rest of the forecast will be dry with high temperatures
returning to near normal by Saturday.


.AVIATION...VFR with some MVFR and local IFR visibilities from
smoke, mainly over the Boise Mountains and between KBNO and KBKE.
Surface winds northeast to southeast 10 kts or less except 10-20 kts
with local gusts to 25 kts through the Snake River Valley. Winds
aloft at 10K ft msl north 5-10 kts.


SHORT TERM...Today through Friday...Northerly flow continues into
Friday as an upper trough remains positioned over the northern
Rockies. Moisture and instability will support isolated showers
over the eastern Boise mountains this afternoon, otherwise dry and
clear conditions will prevail across the area. Less flow and a
weaker surface pressure gradient will result in lighter winds
today. With little change to the airmass temperatures are within a
couple degrees of yesterday`s highs. Friday is dry and 2-5F
degrees warmer across all of southeast Oregon and southwest Idaho.

LONG TERM...Friday night through Wednesday...Dry northwest flow
is expected to turn to dry zonal flow over the area on Saturday
as an upper trough moves south along western Canada. By Monday,
the trough will be closer to, but north of Idaho, and transition
the area into a southwest flow. This pattern is expected to
continue through at least Thursday, and remain dry but warm
temperatures to near or just above normal.





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