Alert archive / Idaho / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 6, NWS Pocatello, ID

April 12, 20266 counties in Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Apr 12, 2026, 2:57 PM MDT for 6 counties in Idaho. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 12, 2026, 2:57 PM MDT (20:57 UTC)
Expired: Apr 12, 2026, 3:30 PM MDT
In force: 33 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bannock County, ID, Bingham County, ID, Bonneville County, ID, Butte County, ID, Clark County, ID, Jefferson County, ID

The radar

The Pocatello radar (KSFX), 53 km from the middle of the area, began a volume at 20:58 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 9.0 hours before the alert went out and 323 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2180 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pocatello, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 12, 12:25 PM MDT, 2 hours 32 minutes earlier. Its key messages:

Strong to severe storms again this afternoon with gusts up to 60 mph and small hail the main threats.
Mountain snow on and off through Monday with isolated to scattered valley rain showers.
Seasonable temperatures through Wednesday before next system arrives bringing more precipitation and even cooler temperatures for Thursday and Friday.

Area forecast discussion, Apr 12, 12:25 PM MDT, 2 hours 32 minutes before

Area Forecast Discussion
National Weather Service Pocatello ID
1225 PM MDT Sun Apr 12 2026

.KEY MESSAGES...

- Strong to severe storms again this afternoon with gusts up to
  60 mph and small hail the main threats.

- Mountain snow on and off through Monday with isolated to
  scattered valley rain showers.

- Seasonable temperatures through Wednesday before next system
  arrives bringing more precipitation and even cooler
  temperatures for Thursday and Friday.

&&

.DISCUSSION...
Issued at 1221 PM MDT Sun Apr 12 2026

Another round of showers and thunderstorms is on tap for this
afternoon and evening as the low we've been talking about for
several days now continues to slowly make its way through northern
California/eastern Oregon and into central Idaho. We're already
starting to see things light up on radar this afternoon with very
pulse-y thunderstorms popping up. These storms today will once again
have the potential to produce strong to severe gusts to around 60
mph with small hail as all of Eastern Idaho is highlighted in SPC's
"Marginal" risk today. Surface CAPE isn't quite as strong today,
with the HREF ensemble generally showing ranges from 200-400 J/kg
across the area, but more clearing/heating than what we say
yesterday it will improve overall instability compared to yesterday.
It will also be windy outside of storms, too, with gusts of 35-45
mph for many. The cold front associated with this system will be
through by Monday, so highs on Monday afternoon will be cooler, only
making it into the low to mid 50s for most. We continue to see
showers into Monday, especially in the Central Mountains where snow
levels will fall to near 5000-5500 ft for Monday which means more
mountains snow ahead. Around Stanley, the forecast shows about 1 to
3 inches of snow while Galena Summit looks closer to 2 to 5 inches
of snow from this afternoon to tomorrow night. Snow totals will be a
bit lighter in the Eastern Highlands, less than an inch on Pine
Creek Pass and closer to 2 to 4 inches for Emigration summit.

By Tuesday, this system will be departing and we will get a bit of a
break in the activity, though a few isolated showers could linger in
the Eastern Highlands into the afternoon. As soon as early Wednesday
morning, our next system begins to move into the Central Mountains
and will spread eastward throughout the rest of our CWA during the
day. Wednesday will be a windy day, especially in the upper Snake
River Plain where gusts are already forecast to be pushing 40-45
mph. Thursday will also be breezy with widespread gusts of 30-40
mph. This system looks to bring in decent moisture for everyone and
colder temperatures as highs will go from mid to upper 50s on
Wednesday to low to mid 40s on Thursday. With temperatures dropping
and precipitation continuing, we are expecting more snowfall in the
mid to upper elevations, but there will also be some potential for
light snow down to valley floors early Thursday morning and early
Friday morning. Of course, this is several days away, so we will
watch this closely over the next few days.

&&

.AVIATION /18Z TAFS THROUGH 18Z MONDAY/...
Issued at 1139 AM MDT Sun Apr 12 2026

Another round of convection is expected this afternoon and
evening with PROB30 TSRA at each East Idaho terminal. VFR
conditions continue, though stronger storms could produce
temporary CIG restrictions to MVFR. Storms will be capable of
producing 45-50kt outflow winds once again, but the general wind
pattern will also support wind gusts outside thunderstorm
activity reaching 25-30kts. Expect dry conditions overnight for
BYI, PIH, and IDA, though SHRA/SHSN will be possible late
tonight into Monday morning for SUN and DIJ. Another round of
more consolidated SHRA reaches SUN for Monday afternoon,
spreading east but decreasing in coverage for the remainder of
the terminals.

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
None.

&&

DISCUSSION...AMM
AVIATION...DMH

In the hours before

Local storm report, Apr 12, 2:28 PM MDT, 29 minutes before

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Local storm report, Apr 12, 2:33 PM MDT, 24 minutes before

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Local storm report, Apr 12, 2:35 PM MDT, 22 minutes before

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Local storm report, Apr 12, 2:36 PM MDT, 21 minutes before

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Local storm report, Apr 12, 2:41 PM MDT, 16 minutes before

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Local storm report, Apr 12, 2:43 PM MDT, 14 minutes before

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The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 12, 12:33 PM MDT	Special Weather Statement	PIH	Cassia	27 min
Apr 12, 12:47 PM MDT	Special Weather Statement	PIH	Oneida	28 min
Apr 12, 1:37 PM MDT	Severe Thunderstorm Warning	PIH	Blaine, Cassia, Lincoln, Minidoka, Power	23 min
Apr 12, 1:42 PM MDT	Special Weather Statement	PIH	Bannock	33 min
Apr 12, 1:58 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Blaine, Butte, Cassia, Minidoka and 1 more	32 min
Apr 12, 2:12 PM MDT	Special Weather Statement	PIH	Bannock, Bear Lake, Caribou, Franklin	48 min
Apr 12, 2:28 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Blaine, Caribou, Power	32 min
Apr 12, 3:11 PM MDT	Special Weather Statement	PIH	Bear Lake	49 min
Apr 12, 3:16 PM MDT	Special Weather Statement	PIH	Clark	29 min
Apr 12, 3:29 PM MDT	Special Weather Statement	PIH	Clark, Jefferson	46 min
Apr 12, 4:11 PM MDT	Special Weather Statement	PIH	Clark, Fremont, Madison	49 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2026 Every severe thunderstorm warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.