Hail in Idaho, September 2, 2021

Name: Hail in Idaho, September 2, 2021
Start: 2021-09-02T17:45
End: 2021-09-02T19:35
Location: Idaho

September 2, 2021 · NWS PIH · 6 events in 2 counties and zones

A long tracking supercell produced severe weather in southeast Idaho.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $9,000
Crop damage: None recorded
Events: 6

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS PIH wrote it up.

A long tracking supercell produced severe weather in southeast Idaho.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Sep 2, 12:34 PM MST, 5 hours 11 minutes earlier.

Area forecast discussion, Sep 2, 12:34 PM MST, 5 hours 11 minutes before

Area Forecast Discussion
National Weather Service Pocatello ID
134 PM MDT Thu Sep 2 2021

.SHORT TERM...Tonight through Sunday.
Throughout today, there have been isolated rain showers and
thunderstorms in the southeast part of the state forming along the
Utah border. These storms have brought with them brief heavy
downpours, gusty winds, and isolated chances for small hail. A
shortwave trough of low pressure continues to work across the
Northern Rockies, which supports the continuation of these showers
and thunderstorms into tonight and early tomorrow for the
southeast corner of the state. An upper level trough moves through
the area into Friday, disrupting southwest flow and leading to
improvement in regional smoke by Friday and into the start of the
weekend. This trough will keep precipitation chances for Friday,
just east of the Idaho into Wyoming, with dry and warming
conditions expected through the weekend. Temperatures for Friday
will be in the 70s, with warmer conditions expected working
through the weekend ahead of a high pressure ridge building just
south of Idaho.
CM/DMH

.LONG TERM...Sunday through Thursday.
Large upper level ridge will dominate the long term period with very
dry and hot conditions expected Sunday through Wednesday.   High
temperatures will be around 10 degrees or so above normal with many
low elevations in the 90 degree or warmer range possible once again.
 Blend of models now delaying any shower or thunderstorm activity
until Thursday which is a day later than yesterday.  Again not
confident in this scenario and the trend of breaking down strong
ridges too soon.  Not expecting strong winds in the upper ridge
scenario although will likely see an increase Wednesday and
Thursday.
GK

&&

.AVIATION...
Will have VFR conditions and expect nothing less than 6 mile
visibility in smoke conditions overnight.   Most thunderstorms will
stay south and east of all TAF sites this evening but have a short
period of vicinity at PIH.  Will have clear skies Friday.
GK

&&

.FIRE WEATHER...
Main impact in the short term will be isolated to scattered
thunderstorms this evening mainly in zones 413 and 411 with the
brunt in 413.   Friday through next Wednesday will be dominated by
high pressure and hot conditions with low humidity and poor
recovery.
GK

&&

.AIR STAGNATION...
Southwest flow will continue through the rest of Thursday, ahead
of a upper level trough moving through the area come Friday. Smoke
continues to linger in the area as a result, but improving
conditions are expected into the later parts of Friday and the
start of the weekend.
CM/DMH

&&

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

The radar

The Pocatello radar (KSFX), 64 km away, was scanning. The volume nearest the first event began at 00:43 UTC.

Open the radar archive at this moment

Event by event

6 hail. Local standard time, as filed.

Hail, Bannock

When: September 2, 5:45 PM MST to 6:00 PM MST
Where: Bannock County, 1 mi NNW of Mc Cammon
Measured: 1 in hail
Reported by: Public
Coordinates: 42.663, -112.188

Hail, Caribou

When: September 2, 7:04 PM MST to 7:20 PM MST
Where: Caribou County, 5 mi WNW of Conda
Measured: 1.25 in hail
Reported by: Public
Coordinates: 42.758, -111.611

Half dollar sized hail in Medowville area.

Hail, Caribou

When: September 2, 7:16 PM MST to 7:30 PM MST
Where: Caribou County, 2 mi WNW of Conda
Measured: 1 in hail
Property damage: $3,000
Reported by: Fire Department/Rescue
Coordinates: 42.741, -111.556

Hail damage reported on vehicle.

Hail, Caribou

When: September 2, 7:19 PM MST to 7:31 PM MST
Where: Caribou County, 2 mi NW of Conda
Measured: 1.5 in hail
Property damage: $6,000
Reported by: Public
Coordinates: 42.751, -111.548

Multiple reports of ping pong ball and half dollar sized hail with many vehicles dented by the hail.

Hail, Caribou

When: September 2, 7:19 PM MST to 7:33 PM MST
Where: Caribou County, 3 mi SW of Conda
Measured: 1.5 in hail
Reported by: Public
Coordinates: 42.699, -111.562

Quarter to ping pong ball sized hail along Panting Rd just south of Horsley Ln.

Hail, Caribou

When: September 2, 7:21 PM MST to 7:35 PM MST
Where: Caribou County, 1 mi WNW of Conda
Measured: 1.5 in hail
Reported by: Public
Coordinates: 42.736, -111.538

Hail reported at Conda town site.

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Idaho in 2021 Every state in 2021 This day in weather history Warnings in Idaho, September 2021

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 984364, 984365, 984367, 984368, 984369, 984371.