Area Forecast Discussion
Issued by NWS Boise, ID

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000
FXUS65 KBOI 271557
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
957 AM MDT Thu Apr 27 2017

.DISCUSSION...Winds are increasing and it will become very windy
east of Boise today where a Wind Advisory is in effect. The winds
will diminish after sunset. Forecast will be updated for slightly
stronger winds and wind gusts from Mountain Home to Twin
Falls/Jerome. Large upper trough will hang back over the area and
support showers, mainly over the higher terrain. Precip amounts
will be light. Temperatures will be cool (10-15 degrees below
normal) with highs only in the mid 40s to mid 50s.

&&

.AVIATION...VFR under mid-to-high level ceilings. Scattered
showers developing this afternoon. Surface winds: west to
northwest 15-25 kts, except 25-35 kts with gusts to 45 kts from
KMUO south and east through the Western Magic Valley. Winds will
diminish across the region around sunset. Winds aloft near 10k ft
MSL: northwest 20-35 kts.

&&

.PREV DISCUSSION...
SHORT TERM...Gusty west/northwest wind will be the main issue
today and Friday as surface high pressure builds eastward from
Oregon under strong northwesterly flow aloft. Current wind
advisory for the Western Magic Valley and southern Twin Falls
County will be expanded to include the Upper Treasure Valley east
of Boise, and extended until 9 PM MDT this evening. Friday will be
almost as windy as today. Numerous rain and snow showers are
expected in the central Idaho mountains today and Friday, with
scattered coverage in the Boise Mountains and southern Idaho
highlands, but only isolated coverage in the valleys. Air mass
will be too stable for thunderstorms today but on Friday there
will be enough instability for a slight chance of afternoon
thunderstorms Friday in eastern-most Idaho zones. Continued cold
today and tonight but about 5 degrees warmer Friday.

LONG TERM...Friday night through Thursday...An upper level ridge
will build into the region in the previous trough`s wake. Will see
a drying and warming trend, with temperatures around 5-10 degrees
below normal. Two fast moving shortwaves will flatten the ridge
and bring a chance of showers to the region Sunday through
Tuesday. The focus of the precipitation will generally be over the
higher terrain north of the Snake River Plain and across Baker
County. By Wednesday, a longwave ridge will slide from off the
Pacific and into the region bringing warm and dry conditions once
more. Temperatures will rise to 5-10 degrees above normal for the
rest of the period as snow levels jump up to 9500+ft MSL for
Thursday.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Wind Advisory until 9 PM MDT this evening IDZ014-016-030.
OR...None.

&&

$$

www.weather.gov/Boise
www.facebook.com/NWSBoise
www.twitter.com/NWSBoise

DISCUSSION...BW
AVIATION.....JS
PREV SHORT TERM...LC
PREV LONG TERM....AB



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