Cassia County, Idaho severe weather history spans 243 recorded events between 1963 and 2026. The dominant hazard is thunderstorm wind, accounting for 51.9% of all recorded events. It ranks #2,153 nationally and #4 in Idaho.
243
Recorded events
4
Direct deaths
12
Direct injuries
$6.1M
Property damage
The record
What the Cassia County, Idaho severe weather history record shows
Across the archive, Cassia County, Idaho severe weather history averages 3.9 recorded events a year. The busiest stretch on record is the 2020s, with 58 events logged in that decade alone. Roughly 35 events fall before 1990 and 208 from 1990 onward — a gap that reflects the expansion of NOAA reporting practice as much as the weather itself.
The deadliest hazard in the Cassia County, Idaho record is thunderstorm wind, responsible for 2 direct deaths. The costliest is flood, with $5.4M in reported property damage. In total, 9 distinct hazard types appear in this county archive, each listed with its own dated record below.
By hazard type
Every hazard type recorded in Cassia County
| Hazard | Events | Deaths | Damage | Max | Span |
|---|---|---|---|---|---|
| Thunderstorm Wind | 126 | 2 | $492K | 70 | 1967–2026 |
| Hail | 59 | 0 | $0 | 1.75 | 1963–2023 |
| Flash Flood | 22 | 1 | $130K | 0 | 1996–2023 |
| Tornado | 10 | 0 | $4K | F0 | 1986–2023 |
| Funnel Cloud | 9 | 0 | $0 | 0 | 1997–2023 |
| Heavy Rain | 8 | 0 | $0 | 0 | 1996–2014 |
| Lightning | 4 | 1 | $12K | 0 | 1996–2015 |
| Flood | 3 | 0 | $5.4M | 0 | 2017–2017 |
| Wildfire | 2 | 0 | $0 | 0 | 1996–2002 |
Decade by decade
Cassia County, Idaho severe weather history by decade
Reporting practice changed over time — early decades are undercounted, not calmer.
Tornado tracks
Paths crossing this county
10 mapped tornado paths intersect this county: 10 touched down inside it and 0 crossed in from a neighbouring county. This comes from path geometry, not county-tagged reports.
| Date | Scale | Deaths | Injuries | Path length | Origin |
|---|---|---|---|---|---|
| 2023-05-26 | EF0 | 0 | 0 | 0.2 mi | Touched down here |
| 2019-08-02 | EF0 | 0 | 0 | 1.0 mi | Touched down here |
| 2012-09-01 | EF0 | 0 | 0 | 1.0 mi | Touched down here |
| 2012-09-01 | EF0 | 0 | 0 | 1.0 mi | Touched down here |
| 2009-04-08 | EF0 | 0 | 0 | 0.3 mi | Touched down here |
| 1998-06-08 | EF0 | 0 | 0 | 0.2 mi | Touched down here |
| 1993-03-17 | EF0 | 0 | 0 | 0.1 mi | Touched down here |
| 1992-06-14 | EF0 | 0 | 0 | 0.3 mi | Touched down here |
| 1991-08-04 | EF0 | 0 | 0 | 0.1 mi | Touched down here |
| 1986-08-24 | EF0 | 0 | 0 | 0.5 mi | Touched down here |
Significant events
Deadliest events on record in Cassia County
| Date | Type | Location | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Aug 10, 1988 | Thunderstorm Wind | 2 | 10 | $0 | |
| Jul 29, 1996 | Flash Flood | MALTA | 1 | 1 | $0 |
| Jul 17, 1996 | Lightning | BURLEY | 1 | 1 | $0 |
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
A warmup in temperatures caused extensive snow melt to lower elevations of Cassia County with devastating flooding throughout the rural county. Flooding began in earnest on the 5th. Interstate 86 was closed for a 36 mile stretch in the county with flooding over the Raft River bridges. A foot and a half of water was over the interstate and it was closed from the 6th until the 9th. The interstate began to flood on the 5th. Cassia County was declared a state disaster area. Dozens of homes were severely damaged by flood waters. Many private wells and septic systems flooded contaminating many homes. Several back roads had to be closed and many suffered tremendous damage.
A strong thunderstorm brought wind damage to much of Cassia County. Several trees were downed with at least 7 vehicles damaged by falling trees in Oakley. Sate highway 77 in Albion was blocked by a downed tree for more than an hour. In Declo, a tree crashed through the roof of a house on Main Street. Several power outages also were reported.
Sheet flooding continued in March throughout Cassia although effects were not nearly as strong as February. Property and road damage continued to add up and many fields in the Oakley area remained under water for much of the month.
Context
Risk, population and federal disasters
Relatively Low
FEMA NRI risk rating
25,483
Population (ACS)
$285K
Median home value
5
Federal declarations
| Declared | Incident | Title | Type |
|---|---|---|---|
| Apr 9, 2020 | Biological | COVID-19 PANDEMIC | DR |
| Mar 13, 2020 | Biological | COVID-19 | EM |
| Apr 21, 2017 | Flood | SEVERE WINTER STORMS AND FLOODING | DR |
| Sep 13, 2005 | Hurricane | HURRICANE KATRINA | EM |
| Dec 31, 1964 | Flood | HEAVY RAINS & FLOODING | DR |
Quick answers
Frequently asked
How many severe weather events have been recorded in Cassia County, Idaho?
243 events are on record between 1963 and 2026, causing 4 direct deaths and $6.1M in property damage.
What is the most common severe weather hazard in Cassia County?
Thunderstorm Wind, with 126 recorded events — 51.9% of everything in the archive for this county.
How many tornadoes have crossed Cassia County?
10 mapped tornado paths intersect the county boundary; 10 of them touched down inside it. This is derived from path geometry, not county-tagged reports.
How many federal disaster declarations cover Cassia County?
5 federal disaster declarations from FEMA include Cassia County, each tied to a specific incident period.
How risky is Cassia County compared with the rest of the country?
FEMA's National Risk Index rates Cassia County as relatively low risk, placing it in the 44 percentile of its state for expected annual loss.
Where does the Cassia County, Idaho severe weather history data come from?
Every figure is drawn from United States federal public-domain records: NOAA/NCEI Storm Events for the event archive, NOAA SPC SVRGIS for mapped tornado paths, FEMA for disaster declarations and risk ratings, and the U.S. Census for population context. Dates are shown in UTC and recent entries may still be revised by NOAA.
Nearby
Neighbouring counties
- Caribou County 105
- Clark County 79
- Canyon County 121
- Clearwater County 93
- Camas County 26
- Custer County 70
Cite this page
“Cassia County, Idaho.” Severe Weather History. severeweatherhistory.com/county/idaho/cassia-county/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.