On the map: every storm report logged this day.
On the map
Storm reports for August 17, 1978
On August 17, 1978, 13 hail, 7 damaging-wind and 2 tornado reports were logged across 13 states.
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On August 17, 1978, 13 hail, 7 damaging-wind and 2 tornado reports were logged across 13 states. The largest hail reported was 2.75″ (baseball size) in Koochiching County, MN.
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 |
|---|---|---|---|---|
| MN | 3 | 1 | 1 | 2.75″ |
| ND | 3 | 0 | 0 | 2.25″ |
| KY | 1 | 2 | 0 | 1.75″ |
| CO | 1 | 1 | 0 | 1.75″ |
| IA | 1 | 0 | 0 | 2.00″ |
| IN | 1 | 0 | 0 | 1.75″ |
| IL | 1 | 0 | 0 | 1.75″ |
| NE | 1 | 0 | 0 | 1.75″ |
| MI | 1 | 0 | 0 | 1.75″ |
| FL | 0 | 0 | 1 | – |
| GA | 0 | 1 | 0 | – |
| LA | 0 | 1 | 0 | – |
| TN | 0 | 1 | 0 | – |
Cities with hail reported within 5 miles
| City | Population | Largest report |
|---|---|---|
| Westminster, CO | 115,302 | 1.75″ |
| Northglenn, CO | 38,287 | 1.75″ |
| Federal Heights, CO | 13,971 | 1.75″ |
| Carmi, IL | 4,679 | 1.75″ |
Hail reports (13)
| Time (UTC) | Size | Location |
|---|---|---|
| 01:00 | 2.75″ | Koochiching County, MN |
| 22:30 | 2.25″ | Cass County, ND |
| 22:10 | 2.00″ | Cass County, ND |
| 08:13 | 2.00″ | Allamakee County, IA |
| 20:00 | 1.75″ | White County, IN |
| 20:00 | 1.75″ | White County, IL |
| 21:55 | 1.75″ | Cass County, ND |
| 22:14 | 1.75″ | Norman County, MN |
| 23:27 | 1.75″ | Clearwater County, MN |
| 23:40 | 1.75″ | Ballard County, KY |
| 03:25 | 1.75″ | Thayer County, NE |
| 04:53 | 1.75″ | Denver County, CO |
| 09:25 | 1.75″ | Roscommon County, MI |
Damage, injuries and deaths
National Weather Service offices recorded about $25,000 in property damage from hail, thunderstorm wind and tornadoes across the US on this storm day (22 events in 13 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 |
|---|---|---|---|---|
| Beltrami County, MN | 1 | 0 | 0 | $25,000 |
| Manatee County, FL | 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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