NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Rock Valley, IA
Every tropical system within 75 miles since 1851 and every tornado within 25 miles since 1950.
No tropical storm or hurricane has passed within 75 miles of Rock Valley, Iowa since records began in 1851. Since 1950, 138 tornadoes have touched down within 25 miles, 5 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 138
- EF3 or stronger
- 5
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
3 deaths in all
Tornadoes within 25 miles of Rock Valley
By decade
- 2020s10
- 2010s18
- 2000s31
- 1990s30
- 1980s14
- 1970s14(2 EF3+)
- 1960s15(3 EF3+)
- 1950s6
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Jul 5, 1978 | F3 | 7 mi | 8 mi | 0 / 0 |
| May 31, 1971 | F3 | 19 mi | 46.5 mi | 0 / 0 |
| Sep 22, 1968 | F3 | 18 mi | 4.7 mi | 0 / 0 |
| Jun 14, 1967 | F3 | 24 mi | 6.2 mi | 0 / 3 |
| Jun 7, 1965 | F3 | 22 mi | 11.5 mi | 0 / 0 |
| Apr 26, 1986 | F2 | 21 mi | 18.5 mi | 1 / 4 |
| Jul 14, 1970 | F2 | 21 mi | 3.8 mi | 1 / 1 |
| May 1, 2008 | EF2 | in town | 12.95 mi | 0 / 0 |
| Jun 7, 1993 | F2 | 24 mi | 10 mi | 0 / 5 |
| May 7, 1993 | F2 | 21 mi | 11.5 mi | 0 / 0 |
| May 7, 1993 | F2 | 22 mi | 15 mi | 0 / 0 |
| May 7, 1993 | F2 | 22 mi | 15 mi | 0 / 1 |
The strongest 12 of 138, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
How to read this page
A storm is listed when the centre of its track passed within 75 miles of Rock Valley while it was at least a tropical storm, which is the reach of damaging wind and rain for a typical hurricane. Being on the list does not mean the city took a direct hit; the "closest" column says how near the centre came. Tornadoes are counted when any part of the path came within 25 miles.
Tornado records before the 1990s are thinner, because weak tornadoes in open country often went unreported before Doppler radar and mobile phones. A rise in the decade counts is mostly better reporting, not a change in the weather.
Tracks come from the National Hurricane Center's HURDAT2 database, tornadoes from the Storm Prediction Center's database. Both are the official federal records and both are revised as old storms are re-analysed.