Ammon, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

352
FXUS65 KPIH 282243
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
443 PM MDT Sun Jun 28 2026

.KEY MESSAGES...

- Rain and snow showers with a few thunderstorms continues
  through Monday evening

- Breezy conditions across southeast and south-central portions
  of Idaho today and Monday

- Expect areas of frost and freeze conditions tonight tonight
  and Monday night

- Gradual warming trend through the week with potential for
  showers and thunderstorm to linger until Friday

&&

.DISCUSSION...
Issued at 1143 AM MDT Sun Jun 28 2026

Low pressure centered across Montana and the central mountains
will continue to keep most of the rain and snow showers and
embedded storms across the central mountains and eastern
highlands through tomorrow morning. Outside of that area, we do
expect showers and thunderstorms to develop a bit farther south
from the Shoshone Lava Beds to around Driggs and Tetonia this
afternoon. We are also expecting a few showers and storms to
develop along the Utah border. We are not expecting a lot of
wind with these storms, but we should see a brief shot of
precipitation, and with the low briefly overhead...it would be
unstable enough for some small hail. For tonight and tomorrow
morning, the main area of precipitation should shift slowly
south and east. A secondary area of showers will develop as part
of the low parked over Idaho shifts east. All of this will begin
to quickly shift north and east out of the state. There will be
some lingering showers and storms tomorrow evening from Stanley
to Driggs. Outside of the central mountains and along the
Montana border, precipitation amounts will be much lower and
more sporadic in some cases. In the central mountains and along
the Montana border, look for an additional 0.30-0.80", with some
locations along the Montana border and higher ridgelines like
the Lost River Range north into Lemhi County seeing
0.80-1.25". Snow has been observed down to between 7000-8000ft
and will likely continue at times, however light snow accumulation
should be mostly limited to at or above 7500ft...and highest
above pass level where several more inches are possible. It is
breezy and will be through tomorrow SOUTH of the main precipitation
shield. We seeing sustained winds up to 25 mph and gusts close
to 35 mph in those areas. We are hitting low end thresholds for
a LAKE WIND ADVISORY, so we have issued that headline through
9 PM this evening. Winds are expected to be a bit stronger
tomorrow before the low departs to the northeast. We have
sustained winds of 25-35 mph with gusts to 45 mph across the
Snake Plain, most of the Magic Valley, and bench areas from
Burley to Rexburg. We have issued a WIND ADVISORY for all of the
Snake Plain and Magic Valley for most of the daytime hours
tomorrow. With colder temperatures in place under this low, we
will see some colder overnight lows tonight and tomorrow night.
Colder mid and higher elevation valleys will likely be near to
below freezing. Across the Snake Plain and Magic Valley, we will
see mid 30s to low/mid 40s. The "coldest" spots will be across
Craters of the Moon and Arco Desert, down to around 35-36
degrees.

For the rest of this week and heading into the Fourth, a gradual
warming trend is expected. The trend, however, has been to keep
a bit more moisture around through most of the week. This, along
with one or more weaker storms pushing through, keeping the
potential for some lighter rain and thunderstorms around. Better
chances each day will across the central mountains and eastern
highlands. Highs push back closer to AVERAGE by Friday.
Temperatures take a bigger leap over the weekend, as we lose the
moisture and drier air works in from the south and west. We
might be dealing with increasing wind heading toward the week,
which could be interesting for any outdoor Fourth of July
festivities.

&&

.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 443 PM MDT Sun Jun 28 2026

We will see the wrap around moisture through the area overnight and
through at least 18z on Monday.  Areas of MVFR due to ceilings can
be expected at airports starting around 09z.  BYI and PIH should
start to clear and ceilings improved by 15z and IDA by 18z.  SUN and
DIJ will remain with rain showers through a good portion of tomorrow
with continued MVFR ceilings.  The Snake Plain can anticipate gusty
west to southwest winds after 18z with some gusts nearing or over
30kts.

&&

.FIRE WEATHER...
Issued at 1143 AM MDT Sun Jun 28 2026

Many areas have received beneficial moisture in the past 24-48
hours. Widespread amounts of 0.50-1.50" have fallen across the
central mountains and Zone 411 along the Montana border, with
more to come. Across the rest of southern and eastern Idaho,
amounts are more sporadic. Amounts range from a few hundredths
to around 0.80", dependent on elevation and where heavier
showers and storms occurred. The bulk of the moisture will
remain across the central mountains and along the Montana border
until the low moves out tomorrow evening. Elsewhere, we expect
some pockets of showers and thunderstorms through this evening,
plus a more concentrated band of showers tonight and tomorrow
morning shifting east. Across most of the central mountains
(475/476) and along the Montana border (411) we are looking for
an additional 0.30-0.80" of moisture, with some amounts across
higher ridgelines seeing potentially up to 1.25". For the rest
of central and eastern Idaho, amounts will be sparse except for
Zone 422 and around Driggs where 0.10-0.40" could fall where
heavier precipitation occurs. With the strength of this low,
gusty winds will continue outside of the central mountains and
Zone 411. Gusts of 20-35 mph are expected through this evening,
with gusts of 25-45 mph forecast. Humidity remains pretty high
and keeps us out of critical fire weather conditions, although
a fire or start could certainly catch if things aligned
correctly.

Temperatures are still looking to gradually climb until we hit
the upcoming holiday weekend. We have one or more weaker storms
crossing the state. There should enough moisture around for some
showers and storms daily, especially across the central
mountains and Zone 411. At the moment, we are definitely not
looking at precipitation numbers like we are seeing right now.
We will be back to lighter rain/virga and a few thunderstorms.
Looking toward the Fourth, this pattern appears to finally
break...which means much warmer and drier working back into
central and eastern Idaho.

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Wind Advisory from 8 AM to 9 PM MDT Monday for IDZ051>055.

&&

$$

DISCUSSION...Keyes
AVIATION...McKaughan/VP
FIRE WEATHER...Keyes