Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 282058

Area Forecast Discussion
National Weather Service Boise ID
258 PM MDT Fri Apr 28 2017

.SHORT TERM...Tonight through Sunday...Isolated showers
associated with an upper trough will end by late this afternoon or
early evening as drier northerly flow in Oregon shifts into SW
Idaho. Gusty northwest winds, especially in the Upper Treasure
Valley, will diminish after sunset. Upper ridge will slide into
the region on Saturday for dry weather and light winds. A weak
cold front will bring a chance of showers, mainly across the
northern high terrain, late Saturday night through Sunday. Breezy
northwest winds will develop behind the front in the afternoon.
High temperatures will be 4-8 degrees warmer on Saturday with
little change on Sunday.

.LONG TERM...Sunday night through Saturday...Cool temperatures
will persist on Monday, as the upper level flow trends
northwesterly behind an exiting cold front. An upper level short
wave, embedded in this northwesterly flow, will cut southeast
across eastern Oregon and southern Idaho late Monday night;
supporting stronger surface winds and isolated-to-scattered
showers through early Tuesday morning. (Precipitation will fall as
snow above 5000 feet, but any accumulation will be light.)
Significant drying will occur Tuesday, Wednesday, and Thursday as
a highly amplified Pacific ridge builds inland over the
Intermountain West. Expect mostly sunny skies and warm
temperatures in this pattern, with lower valleys warming into the
70s both Wednesday and Thursday. Showers and thunderstorms are
likely to return next weekend, as an incoming long wave trough
threatens to break down the upper ridge.


.AVIATION...Predominantly VFR under scattered-to-broken cumulus
clouds. Cloud bases generally 7K to 10K feet MSL. Isolated showers
will continue through 01Z, but ceilings will likely remain MVFR
or higher. Gusty west-northwest surface winds of 15 to 25 kt, with
gusts to 35 kt, will continue through 02Z. Winds, surface to 10K
feet, will be northwesterly 20-35 kt.

Weekend Outlook...Mostly sunny skies and VFR conditions on
Saturday. Gusty winds and scattered MVFR showers on Sunday, in
response to a passing cold front.





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