On the map: every storm report logged this day.
On the map
Storm reports for August 21, 2018
On August 21, 2018, 2 hail, 29 damaging-wind and 1 tornado reports were logged across 11 states.
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On August 21, 2018, 2 hail, 29 damaging-wind and 1 tornado reports were logged across 11 states. The largest hail reported was 1.25″ (half dollar size) in Cimarron County, OK.
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 |
|---|---|---|---|---|
| PA | 0 | 5 | 1 | – |
| WV | 0 | 6 | 0 | – |
| CO | 1 | 4 | 0 | 1.00″ |
| MD | 0 | 5 | 0 | – |
| OK | 1 | 2 | 0 | 1.25″ |
| NY | 0 | 2 | 0 | – |
| TX | 0 | 1 | 0 | – |
| GA | 0 | 1 | 0 | – |
| SC | 0 | 1 | 0 | – |
| VA | 0 | 1 | 0 | – |
| NC | 0 | 1 | 0 | – |
Hail reports (2)
| Time (UTC) | Size | Location |
|---|---|---|
| 01:46 | 1.25″ | Cimarron County, OK |
| 18:25 | 1.00″ | Mesa County, CO |
Damage, injuries and deaths
National Weather Service offices recorded about $29,000 in property damage from hail, thunderstorm wind and tornadoes across the US on this storm day (33 events in 11 states). Injuries and deaths are those the events caused directly.
| County | Events | Injuries | Deaths | Property damage |
|---|---|---|---|---|
| Rowan County, NC | 1 | 0 | 0 | $10,000 |
| Elk County, PA | 1 | 0 | 0 | $5,000 |
| Somerset County, PA | 1 | 0 | 0 | $4,000 |
| Mesa County, CO | 1 | 0 | 0 | $2,000 |
| Allegany County, NY | 1 | 0 | 0 | $2,000 |
| Bedford County, PA | 1 | 0 | 0 | $2,000 |
| Jefferson County, PA | 2 | 0 | 0 | $2,000 |
| Cattaraugus County, NY | 1 | 0 | 0 | $1,000 |
| Warren County, PA | 1 | 0 | 0 | $1,000 |
What the National Weather Service wrote
- Rowan County, NC (near Cleveland) · Thunderstorm wind 46 mph · $10,000
“Spotter reported a tree blown down on an apartment building on Academy St.” - Elk County, PA (near Brockport) · Tornado EF1 · $5,000
“A NWS storm survey determined that an EF1 tornado touched down in Jefferson County, PA and traveled northeastward into Elk County, PA before lifting near Brockport. Maximum winds were estimated around 90 mph, with maximum path width of approximately 300 yards.” - Somerset County, PA (near Hays Mills) · Thunderstorm wind 60 mph · $4,000
“A severe thunderstorm producing winds estimated near 60 mph knocked down trees onto wires along Cumberland Highway northeast of Meyersdale.” - Mesa County, CO (near Mack) · Thunderstorm wind 70 mph · $2,000
“Estimated peak wind gust of 70 MPH. Winds produced damage to a large amount of roof shingles.” - Bedford County, PA (near Palo Alto) · Thunderstorm wind 60 mph · $2,000
“A severe thunderstorm producing winds estimated near 60 mph knocked down trees along Pine Ridge Road in Cumberland Township.” - Allegany County, NY (near Cuba) · Thunderstorm wind 60 mph · $2,000
“Trees and wires reported down by law enforcement.”
Event narratives from NWS Storm Data, shortened. Up to six per day, chosen by deaths, injuries, damage and size.
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.
NWS Tornado Damage Surveys for August 21, 2018
National Weather Service survey teams mapped 1 tornado path from this storm day (1 EF1), 2 miles in all. The map above draws each surveyed path as the NWS mapped it, colored by the EF rating of each stretch, in place of the straight start-to-end line.
| Rating | Peak wind | Path length | Max width | Deaths / injuries | On the ground | Surveyed by |
|---|---|---|---|---|---|---|
| EF1 | – | 2.4 mi | – | 0 / 0 | 20:10–20:15 UTC | NWS CTP, |
Source: NOAA National Weather Service Damage Assessment Toolkit (DAT): the tornado paths and EF-rating zones NWS survey teams mapped after each storm. Survey data are preliminary and can be revised; NOAA's official record is Storm Data (NCEI). Paths are simplified to about 30 m. Times are when the tornado was on the ground, in UTC.
Guides: What radar-estimated hail (MESH) is and isn't · Storm reports: preliminary vs final
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