Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 250907
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
307 AM MDT Thu May 25 2017

.SHORT TERM...Cool upper trough over our area currently extends from
a low in Saskatchewan.  Trough will be reinforced later today by a
short wave trough moving south from BC.  This will keep temps below
normal while increasing PoPs in northern areas this afternoon.
Air mass will be unstable enough for a slight chance of
thunderstorms in northern areas this afternoon.  An upper low will
form in central Idaho tonight, then weaken Friday as it moves east
into Wyoming.  Cyclonic flow around the low will maintain showers
through Friday especially in the Idaho mountains north of the Snake
Basin.  Slight chance of thunderstorms in central and south-
central Idaho Friday afternoon.  Oregon will dry out Friday as
big coastal upper ridge begins to come inland.  Light west or
northwest winds through Friday, except locally moderate wind
speeds in the Upper Treasure valley and western Magic Valley.

.LONG TERM...Friday night through Wednesday...The upper level trough
will depart Friday night, but enough moisture and instability will
remain over our area for isolated showers and thunderstorms over the
central Idaho mountains and the higher terrain along the Idaho-
Nevada border. On Saturday an upper level ridge building in from the
west will bring dry weather, and a warming trend which will continue
through Wednesday. Temperatures will be near normal on Saturday, and
rise to 10-15 degrees above normal by Wednesday.

&&

.AVIATION...Mainly VFR. Showers and isolated thunderstorms will
develop this afternoon over northern Harney and Malheur Counties,
Baker County, and the central Idaho mountains. Thunderstorms will
end by 06z Friday, but showers will continue, spreading south to the
Nevada border by 12z Friday. Surface winds will be northwest 5-10
kts. Winds aloft near 10k ft msl will be northwest to north 10-15
kts.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.

&&

$$

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

SHORT TERM...LC
LONG TERM....JT
AVIATION.....JT



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