Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 240237
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
837 PM MDT Mon Apr 23 2018

.DISCUSSION...Weak showers over the far eastern part of the area,
roughly from Atlanta south and east to Fairfield, continue to move
southeast at about 20 mph as of 830 pm MDT. They are expected to
dissipate with the loss of daytime heating shortly after sunset.
Otherwise, winds will weaken overnight and skies are expected to
clear in the east, and remain clear elsewhere. No changes are
planned at this time.

&&

.AVIATION...VFR with mostly clear skies. Surface winds, variable 10-
15kts through Tuesday afternoon then southeasterly 10-15kts. Winds
aloft to 10k feet MSL, northerly 10-20kts then easterly Tuesday
afternoon 15-20kts.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Thursday...Scattered showers and
isolated thunderstorms early this evening in the Camas Prairie
and nearby due to the departing upper trough in eastern Idaho.
Otherwise clearing and warming through Thursday under an upper
level ridge.  Thursday will be the warmest day of the year so
far with high temps reaching 80 in the lower southern valleys,
and upper 60s through 70s in the rest of our CWA.  No significant
winds.

LONG TERM...Thursday night through Monday...Model differences begin
Friday and become significant Saturday regarding the approach of
upper low off the Oregon coast.  Latest model consensus begins a
cooling trend Friday, and the onset of showers and thunderstorms
in Oregon as the low comes inland. Saturday and Saturday night
will bring a better chance of showers and thunderstorms to all
areas as the low comes further inland. New forecast is trending
significantly wetter and cooler for Saturday. The upper level low
will continue inland and into the Great Basin with showers and
afternoon/evening thunderstorms expected through Monday. Model
differences will continue, as often happens with a closed upper
low. Therefore, while the forecast is of low certainty, cool and
unsettled weather is to be expected.

&&

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

&&

$$

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DISCUSSION...SP
AVIATION.....JC
PREV SHORT TERM...LC
PREV LONG TERM....LC/AB



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