Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 280303

Area Forecast Discussion
National Weather Service Boise ID
903 PM MDT Thu Apr 27 2017

.DISCUSSION...Circulation over central Idaho will continue to feed
shower development across higher terrain of southeast Oregon and
southwest Idaho tonight. Valleys are dry overnight, but will keep
some cloud cover into Friday morning. Winds are diminishing this
evening with the loss of upper air support, but open terrain will
keep a noticeable west wind overnight before it ramps up again on
Friday. The cold air mass and partial clearing will support chilly
low temperatures Friday morning, with a frost possible in lower
valleys. Current forecast is on track for tonight so no update.


.AVIATION...VFR with mid-upper level cloud cover. Showers continue
to press southeastward and are isolated in coverage. Surface winds,
west-north 10-15 kts with higher gusts remaining in the Magic Valley
through the night. Winds aloft to 10k feet MSL, northerly 15-30 kts.


SHORT TERM...Tonight through Saturday...Scattered showers (with
snow levels around 4500 feet) developed over the higher terrain
this afternoon, with little to no activity in the Treasure/Western
Magic Valleys. The showers will diminish in most areas after
sunset. The showers will persist in the SW Idaho mountains through
Friday as an upper trough lingers over the Intermountain West.
Dry weather returns late Friday night through Saturday as an upper
ridge builds into Oregon and SW Idaho. Winds will remain gusty,
reaching or exceeding advisory levels east of Boise, until around
sunset. The gusty winds return on Friday with the greatest winds
expected in the Upper Treasure Valley, where winds will approach
but not attain Wind Advisory levels. Lighter winds are expected
with the building ridge on Saturday. Temperatures will trend
warmer through the period - to near normal in SE Oregon and
slightly below normal in SW Idaho on Saturday.

LONG TERM...Saturday night through Thursday...An upper level
ridge builds over the region beginning Sunday and remain in place
through Thursday. Except for two fast moving shortwaves bringing a
chance of showers to the region Sunday afternoon and Tuesday
morning, the region will see drier and warmer conditions, with
temperatures around normal. The ridge reaches peak amplitude on
Thursday with temperatures reaching the mid to upper 70s in the
lower valleys.





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