On the map: every storm report logged this day.
On the map
Storm reports for July 31, 1966
On July 31, 1966, 2 hail, 5 damaging-wind and 8 tornado reports were logged across 3 states.
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← Jul 30, 1966 All 1966 storm days · July 1966 Aug 1, 1966 →
On July 31, 1966, 2 hail, 5 damaging-wind and 8 tornado reports were logged across 3 states. The largest hail reported was 2.75″ (baseball size) in Mercer County, ND. Tornadoes killed 3.
Storm day runs 7 a.m. to 7 a.m. Eastern (12:00–12:00 UTC), the convention the Storm Prediction Center uses. Radar hail estimates start October 2019.
Storm reports by state
| State | Hail | Wind | Tornado | Largest hail |
|---|---|---|---|---|
| ND | 2 | 1 | 7 | 2.75″ |
| SD | 0 | 2 | 1 | – |
| TX | 0 | 2 | 0 | – |
Hail reports (2)
| Time (UTC) | Size | Location |
|---|---|---|
| 02:00 | 2.75″ | Mercer County, ND |
| 21:50 | 0.75″ | Stark County, ND |
Damage, injuries and deaths
National Weather Service offices recorded about $553,000 in property damage, 7 injuries and 3 deaths from hail, thunderstorm wind and tornadoes across the US on this storm day (16 events in 3 states). Before 1996 the database holds only tornado, hail and wind events, and damage was often entered as a range, so treat these figures as rough. Injuries and deaths are those the events caused directly.
| County | Events | Injuries | Deaths | Property damage |
|---|---|---|---|---|
| McPherson County, SD | 1 | 4 | 2 | $250,000 |
| Brown County, SD | 1 | 3 | 1 | $250,000 |
| Dickey County, ND | 1 | 0 | 0 | $25,000 |
| McIntosh County, ND | 1 | 0 | 0 | $25,000 |
| Mercer County, ND | 1 | 0 | 0 | $3,000 |
| Ransom County, ND | 1 | 0 | 0 | $0 |
Source: NOAA National Centers for Environmental Information (NCEI), Storm Events Database, as entered by National Weather Service offices; data through July 31, 2026. Damage is in dollars of the year, not adjusted for inflation.
Guides: What radar-estimated hail (MESH) is and isn't · Storm reports: preliminary vs final
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