Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 290311

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

.DISCUSSION...Isolated showers have dissipated this evening and
cloud cover is quickly diminishing. Winds will weaken overnight
under a developing surface high. The clear skies and light winds
will support sub-freezing temperatures in the mountains and near
freezing temperatures at lower elevations Saturday morning.
Forecast for tonight is on track, so no updates.


.AVIATION...VFR. Mostly clear skies with some mid-upper level cloud
cover pushing in late Saturday. Surface winds, variable 5-15 kts.
Winds aloft to 10k feet MSL, north-west 10-30 kts.

Weekend Outlook...Increased cloud cover late Saturday into Sunday.
Chances of showers push through Sunday afternoon into the evening.
Gusty winds Sunday afternoon.


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.





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