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Tornado in Delaware County, Oklahoma
66 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.
Delaware County, Oklahoma, has 66 tornado events in the NCEI record since 1950, with at least one in 30 different years.
May is the busiest month, with 36 of the recorded events. The last 20 years account for 39 events against 12 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.3% of the 5,054 tornado events recorded in Oklahoma; its 8.9 per 100 square miles compares with 7.4 statewide.
By rating: 10 at (E)F0, 35 at (E)F1, 13 at (E)F2, 6 at (E)F3, 0 at (E)F4, 0 at (E)F5 and 2 unrated. Tornadoes before 2007 carry the original Fujita rating.
Compared with Oklahoma
| Measure | Delaware County | Oklahoma | US |
|---|---|---|---|
| Tornado events since 1950 | 66 | 5,054 | 81,281 |
| Per 100 square miles | 8.9 | 7.4 | 2.3 |
| Per 10,000 residents | 16.1 | 12.7 | 2.4 |
| Deaths recorded | 0 | 364 | 6,410 |
| Busiest month | May | May | May |
By year
Seasonality
0Feb
0Mar
5Apr
14May
36Jun
3Jul
2Aug
1Sep
0Oct
4Nov
1Dec
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 66 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 |
|---|---|---|---|---|---|---|---|
| 6 Mar 2026 | Tornado | EF unrated | — | — | — | — | County |
| 17 Jun 2025 | Tornado | EF1 | $20K | — | — | — | County |
| 29 Apr 2025 | Tornado | EF1 | $150K | — | — | — | County |
| 29 Apr 2025 | Tornado | EF1 | $100K | — | — | — | County |
| 29 Apr 2025 | Tornado | EF1 | — | — | — | — | County |
| 21 Jul 2024 | Tornado | EF unrated | — | — | — | — | County |
| 25 May 2024 | Tornado | EF1 | $150K | — | — | — | County |
| 25 May 2024 | Tornado | EF1 | — | — | — | — | County |
| 10 Oct 2021 | Tornado | EF1 | — | — | — | — | County |
| 25 May 2020 | Tornado | EF0 | — | — | — | — | County |
| 25 May 2020 | Tornado | EF1 | — | — | — | — | County |
| 25 May 2020 | Tornado | EF0 | — | — | — | — | County |
| 22 May 2019 | Tornado | EF1 | $100K | — | — | — | County |
| 22 May 2019 | Tornado | EF2 | $500K | — | — | — | County |
| 20 May 2019 | Tornado | EF2 | $150K | — | — | — | County |
| 20 May 2019 | Tornado | EF1 | $50K | — | — | — | County |
| 30 Apr 2019 | Tornado | EF1 | $75K | — | — | — | County |
| 30 Nov 2018 | Tornado | EF1 | $50K | — | — | — | County |
| 26 Apr 2016 | Tornado | EF1 | $100K | — | — | — | County |
| 29 May 2015 | Tornado | EF1 | $10K | — | — | — | County |
| 16 May 2015 | Tornado | EF1 | $50K | — | — | — | County |
| 16 May 2015 | Tornado | EF1 | $20K | — | — | — | County |
| 2 Apr 2015 | Tornado | EF1 | $75K | — | — | — | County |
| 31 May 2013 | Tornado | EF1 | — | — | — | — | County |
| 18 Apr 2013 | Tornado | EF2 | $400K | — | — | — | County |
| 24 May 2011 | Tornado | EF1 | — | — | — | — | County |
| 24 May 2011 | Tornado | EF1 | — | — | — | — | County |
| 22 May 2011 | Tornado | EF2 | $250K | — | — | — | County |
| 22 May 2011 | Tornado | EF2 | $1.0M | — | — | — | County |
| 22 May 2011 | Tornado | EF0 | — | — | — | — | County |
| 22 May 2011 | Tornado | EF2 | $400K | — | — | 12 | County |
| 22 May 2011 | Tornado | EF1 | — | — | — | — | County |
| 22 May 2011 | Tornado | EF3 | $1.0M | — | — | 2 | County |
| 22 May 2011 | Tornado | EF1 | — | — | — | — | County |
| 22 May 2011 | Tornado | EF1 | $25K | — | — | — | County |
| 11 May 2011 | Tornado | EF1 | $250K | — | — | — | County |
| 22 Apr 2011 | Tornado | EF0 | — | — | — | — | County |
| 14 Apr 2011 | Tornado | EF2 | $100K | — | — | 3 | County |
| 13 May 2010 | Tornado | EF1 | — | — | — | — | County |
| 12 Mar 2006 | Tornado | F1 | $750K | — | — | — | County |
| 12 Mar 2006 | Tornado | F3 | $3.0M | — | — | 8 | County |
| 16 May 2003 | Tornado | F1 | $1.0M | — | — | 2 | County |
| 24 May 2000 | Tornado | F0 | — | — | — | — | County |
| 17 Apr 1995 | Tornado | F0 | $5K | — | — | — | County |
| 8 Oct 1993 | Tornado | F0 | — | — | — | — | County |
| 30 May 1993 | Tornado | F0 | $500K | — | — | — | County |
| 30 Jul 1992 | Tornado | F0 | — | — | — | — | County |
| 28 Oct 1991 | Tornado | F1 | $250K | — | — | — | County |
| 28 Oct 1991 | Tornado | F0 | $3K | — | — | — | County |
| 12 Jun 1989 | Tornado | F1 | — | — | — | — | County |
| 8 May 1989 | Tornado | F2 | $250K | — | — | 1 | County |
| 27 Apr 1984 | Tornado | F2 | $2.5M | — | — | — | County |
| 15 Mar 1984 | Tornado | F1 | $30 | — | — | — | County |
| 23 May 1981 | Tornado | F2 | — | — | — | — | County |
| 7 Apr 1980 | Tornado | F2 | $250K | — | — | — | County |
| 7 Apr 1980 | Tornado | F3 | $2.5M | — | — | — | County |
| 8 Jun 1974 | Tornado | F3 | $250K | — | — | — | County |
| 23 May 1974 | Tornado | F1 | $25K | — | — | — | County |
| 22 May 1971 | Tornado | F2 | $250K | — | — | — | County |
| 4 Apr 1969 | Tornado | F1 | $25K | — | — | — | County |
| 11 May 1966 | Tornado | F1 | $3K | — | — | — | County |
| 9 May 1959 | Tornado | F3 | $250K | — | — | — | County |
| 9 May 1959 | Tornado | F2 | $25K | — | — | — | County |
| 14 Aug 1957 | Tornado | F1 | $3K | — | — | — | County |
| 20 May 1957 | Tornado | F3 | $3K | — | — | — | County |
| 24 Mar 1954 | Tornado | F1 | $25K | — | — | — | County |
Questions and answers
How many tornado events has Delaware County had?
66 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 Delaware County?
6 Mar 2026 (Tornado, EF unrated). Records reach NCEI about 120 days after the month ends.
What was the most damaging tornado event recorded in Delaware County?
The tornado of 12 Mar 2006, with property damage estimated by NCEI at $3.0M.
How does Delaware County compare with Oklahoma for tornado?
8.9 events per 100 square miles against 7.4 statewide; the county holds 66 of the state's 5,054 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.