Middleton, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

456
FXUS65 KBOI 300224
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
824 PM MDT Thu May 29 2025

.DISCUSSION...A Pacific cold front passed through our CWA
this afternoon and will exit east late this evening. Front
produced gusty west/northwest winds 15-30 mph and slightly
reduced visibility due to blowing dust. Scattered showers
and isolated thunderstorms in eastern Owyhee and southern
Twin Falls Counties were fading as of 8 PM MDT. Tonight and
Friday morning will be slightly cooler behind the cold front,
but Friday will end up as warm as today as the main upper
ridge quickly rebuilds over the Great Basin. Saturday
continues to look hot. A Heat Advisory will be in effect
from late Saturday morning through early Saturday evening.
Sunday should be 15-20 degrees cooler and also windy as a
north Pacific cold front comes through, and Monday another
5 degrees cooler as the upper trough comes in. Current
forecast is on track. No update.

&&

.AVIATION...VFR. Showers and thunderstorms along the ID/NV
border and near the Magic Valley are weakening through the
evening. Mountains obscured in showers and thunderstorms.
Surface winds: W-NW 10-15 kt with gusts up to 20-25 kt through
the evening. Winds aloft at 10kft MSL: W/NW 10-20 kt.

KBOI...VFR. NW 8 to 12 kt with gusts to 20 kt. Gusts expected
to weaken after 04z.

Weekend Outlook...VFR. Record breaking heat Saturday, resulting
in high density altitude across the region. 15-30 percent chance
of showers and thunderstorms in SW ID Sunday afternoon and
evening, primarily along ID/NV border. Surface winds: mainly
variable to 10 kt through Saturday, then NW 10-20 kt with gusts
to 30 kt on Sunday.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Saturday night...A cold front will
move over the area this afternoon and evening. This will bring
breezy west-northwest winds up to 30 mph, except stronger winds
up to 45 mph possible over Baker County near Huntington OR and
Farewell Bend along the I-84 corridor this evening. Isolated
thunderstorms this afternoon, mainly over the Idaho mountains
ans southwest Idaho highlands. Thunderstorms this afternoon are
capable of producing erratic outflow winds up to 50 mph, mainly
over the southwest Idaho highlands and Owyhee Mountains. Some
of these outflows may move into the Treasure and Magic Valleys
producing areas of blowing dust in the evening. Then the hottest
temperatures of the season expected, with lower valleys near
100F and record breaking values on Saturday. A heat advisory has
been issued for Saturday afternoon for temperatures 95 to 102 in
the lower valleys.

LONG TERM...Sunday through Thursday...After likely record breaking
heat Saturday, Sunday and the rest of the long term stands to
be cooler. On Sunday, the upper-level ridge will move to the
east, giving way to a longwave upper-level trough to begin
impacting the region. Earlier model runs had a "bowling ball"
upper-level low move over the region, but recent model trends
have the cut-off low moving south along the coast of California.
That places SE OR and SW ID in a broader troughing pattern,
retaining NW flow for much of the extended. From this change,
cool temperatures and precipitation chances are tempered from
previous forecasts. Still, temperatures will be hovering near
normal for this time of year. Precipitation chances are highest
(30-50%) along the ID/NV border and Western Magic Valley Sunday
afternoon into evening, with thunderstorm chances mentionable
(15%) during this period. Subsequent precipitation chances later
in the week will likely trend down with this overall pattern
change. On Sunday and Monday, wind gusts up to 35 mph are
likely (50-80%) through the lower and upper Treasure Valley
and Western Magic Valley. Hint of zonal flow moving in is
shown late Thursday.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Heat Advisory from noon to 7 PM MDT Saturday
     IDZ012-014-016-033.
OR...Heat Advisory from noon MDT /11 AM PDT/ to 7 PM MDT /6 PM PDT/
     Saturday ORZ061>064.

&&

$$

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DISCUSSION...LC
AVIATION.....JY
SHORT TERM...KA
LONG TERM....CH