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000
FXUS65 KBOI 220249
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
849 PM MDT Sun Apr 21 2024

.DISCUSSION...High clouds are moving across the region this
evening as a broad upper level plume of moisture moves across
the northwest. Skies will clear later this evening, allowing for
overnight temperatures to plummet to near or below freezing
across much of the region. A warming trend will return tomorrow
through Tuesday afternoon, along with calmer winds and dry
conditions as an upper level ridge builds into the area. The
next chance of precipitation and cooler temperatures looks to
arrive late Tuesday, along with a chance for thunderstorms near
the Nevada border. Current forecast handles this well, so no
updates are necessary.

&&

.AVIATION...VFR with decreasing clouds. Surface winds: NW 5-15
kt through the early evening, becoming variable less than 10 kt
overnight. Winds aloft at 10kft MSL: W 20-30 kt, becoming WNW
by 22/12Z.

KBOI...VFR with high clouds diminishing overnight. Surface winds
will be NW 10-20 kt until 22/08Z, when they will become light
and variable.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Tuesday night...After today`s cold
front, temps will be nearly the same tomorrow, but with weaker
winds. Then a nice warm up begins Monday into Tuesday. An upper
level ridge will move toward and then over the region Monday and
Tuesday. Southwest flow will move in late Tuesday, bringing an
increase in moisture and instability and introducing a chance
(10-40%) of showers and thunderstorms Tue aft/eve. Temps both
Mon will be a couple of degrees above normal, moving up to
around 10 degrees above normal Tuesday.

LONG TERM...Wednesday through Sunday... An upper level trough
will develop and then deepen to our west Wed and Thu before
moving through late Thu and Thu night. This will bring a chance
of showers each day, and even a few thunderstorms Wed aft/eve.
Additional troughing will then move into the PacNW Friday and
move through late Friday night into Saturday. Showers will
continue through at least Saturday. Models diverge importantly
Sunday, with some showing relatively dry NW flow aloft while
others show a more moist SW flow. Therefore, confidence in the
chance of precipitation Sunday is below normal for this time
range. Confidence is higher that precip will be above normal and
temps will be near normal Fri-Sat.

&&

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

&&

$$

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DISCUSSION...SA
AVIATION.....SA
SHORT TERM...SP
LONG TERM....SP