States › North Dakota › Mercer County › Tornado
Tornado in Mercer County, North Dakota
22 tornadoes events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Tornado.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 22 tornado events in Mercer County, North Dakota, between 1950 and 2026, spread over 18 years.
July is the busiest month, with 9 of the recorded events. The last 20 years account for 6 events against 5 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.2% of the 1,799 tornado events recorded in North Dakota; its 2.1 per 100 square miles compares with 2.6 statewide.
By rating: 12 at (E)F0, 5 at (E)F1, 1 at (E)F2, 1 at (E)F3, 0 at (E)F4, 0 at (E)F5 and 3 unrated. Tornadoes before 2007 carry the original Fujita rating.
Compared with North Dakota
| Measure | Mercer County | North Dakota | US |
|---|---|---|---|
| Tornado events since 1950 | 22 | 1,799 | 81,281 |
| Per 100 square miles | 2.1 | 2.6 | 2.3 |
| Per 10,000 residents | 26.4 | 23.2 | 2.4 |
| Deaths recorded | 0 | 29 | 6,410 |
| Busiest month | July | June | May |
By year
Seasonality
0Feb
0Mar
0Apr
0May
2Jun
5Jul
9Aug
5Sep
0Oct
1Nov
0Dec
0
Magnitude distribution
Enhanced Fujita scale wind estimates
- EF0/F0
- 65–85 mph (EF0)
- EF1/F1
- 86–110 mph (EF1)
- EF2/F2
- 111–135 mph (EF2)
- EF3/F3
- 136–165 mph (EF3)
- EF4/F4
- 166–200 mph (EF4)
- EF5/F5
- over 200 mph (EF5)
- Unrated
- no rating recorded
Tornado rating as recorded (Fujita scale before February 2007, Enhanced Fujita after).
Recorded events
All 22 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 30 Aug 2025 | Tornado | EF unrated | — | — | — | — | County |
| 8 Jul 2019 | Tornado | EF0 | — | — | — | — | County |
| 1 Jun 2018 | Tornado | EF0 | — | — | — | — | County |
| 8 Jul 2011 | Tornado | EF0 | — | — | — | — | County |
| 8 Jul 2011 | Tornado | EF0 | — | — | — | — | County |
| 1 Aug 2010 | Tornado | EF0 | $50K | — | — | — | County |
| 15 Aug 1999 | Tornado | F0 | — | — | — | — | County |
| 13 Jun 1999 | Tornado | F1 | $150K | — | — | — | County |
| 10 Jul 1997 | Tornado | F0 | $35K | — | — | — | County |
| 6 Jul 1990 | Tornado | F0 | — | — | — | — | County |
| 4 Jul 1988 | Tornado | F0 | $250K | — | — | — | County |
| 11 Jun 1980 | Tornado | F0 | — | — | — | — | County |
| 13 May 1977 | Tornado | F0 | — | — | — | — | County |
| 19 Jul 1976 | Tornado | F1 | $250K | — | — | — | County |
| 12 Jul 1976 | Tornado | F1 | $25K | — | — | 2 | County |
| 11 Jun 1976 | Tornado | F0 | — | — | — | — | County |
| 24 May 1975 | Tornado | F2 | $25K | — | — | — | County |
| 12 Aug 1969 | Tornado | F1 | $25K | — | — | — | County |
| 2 Oct 1967 | Tornado | — | $3K | — | — | — | County |
| 31 Jul 1966 | Tornado | — | $3K | — | — | — | County |
| 21 Aug 1962 | Tornado | F1 | $25K | — | — | — | County |
| 18 Jun 1956 | Tornado | F3 | $250K | — | — | 1 | County |
Questions and answers
How many tornado events has Mercer County had?
22 events in the NCEI Storm Events record between 1950 and 2026. Reporting of tornadoes became far more complete after 1996, so early decades undercount.
When was the last recorded tornado event in Mercer County?
30 Aug 2025 (Tornado, EF unrated). Records reach NCEI about 120 days after the month ends.
What was the most damaging tornado event recorded in Mercer County?
The tornado of 18 Jun 1956, with property damage estimated by NCEI at $250K.
How does Mercer County compare with North Dakota for tornado?
2.1 events per 100 square miles against 2.6 statewide; the county holds 22 of the state's 1,799 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Tornado hub and the county page.