Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 240245

Area Forecast Discussion
National Weather Service Boise ID
845 PM MDT Wed May 23 2018

.DISCUSSION...Shower and thunderstorm coverage will continue to
thin out and weaken this evening with the loss of daytime
heating. While most areas dry out by midnight, southeast Oregon
and the west-central Idaho mountains will keep a slight chance of
showers through the night. Have updated the forecast for evening
precipitation chances.


.AVIATION...Mostly VFR. Showers diminishing overnight. Showers and
thunderstorms expected again after 24/18Z. Gusty winds to 30 kts
near storms, but otherwise expect surface winds to be variable and
less than 8 kts. Winds aloft near 10 KFT MSL: Southwest 5-10 kts.


SHORT TERM...Tonight through Saturday...Scattered showers and
thunderstorms have developed on the Oregon side this afternoon, but
less on the Idaho side.  Upper low in western WY this morning has
moved away and a short wave ridge has come in over our CWA.  A weak
impulse in the southwesterly flow over Oregon will continue showers
and thunderstorms this evening in eastern Oregon and in the west
central Idaho mountains.  Otherwise tonight should be generally dry
on the Idaho side with only a slight chance of lingering showers on
the oregon side.  Thursday will be warmer than today under the upper
ridge, but showers and thunderstorms will develop in the afternoon
especially in northern mountains.  Pacific upper low off California
will circulate moisture from the south into central and eastern
Oregon late Thursday night and Friday morning leading to widespread
showers and thunderstorms there, gradually shifting eastward into
Idaho late Friday through Saturday.  Models develop strong
instability for thunderstorms north of the Snake basin in Idaho
Saturday afternoon.

LONG TERM...Saturday night through Wednesday...An upper level low
moving through southern NV through the weekend will bring showers
across the area with afternoon thunderstorms. SE Oregon will begin
to dry out Monday and remain dry through the remainder of the
forecast period. Showers linger in SW Idaho through the end of the
period, but do remain confined to mostly the higher elevations.
Temperatures will hover right around normal for this time of year.





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