On the map: every storm report logged this day.
On the map
Storm reports for September 11, 2017
On September 11, 2017, 4 hail, 18 damaging-wind and 5 tornado reports were logged across 2 states.
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Other storms on September 11 →
On September 11, 2017, 4 hail, 18 damaging-wind and 5 tornado reports were logged across 2 states. The largest hail reported was 0.88″ (nickel size) in Tulare County, CA.
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 |
|---|---|---|---|---|
| CA | 4 | 17 | 0 | 0.88″ |
| SC | 0 | 1 | 5 | – |
Cities with hail reported within 5 miles
| City | Population | Largest report |
|---|---|---|
| Corcoran, CA | 22,627 | 0.88″ |
| Daly City, CA | 101,418 | 0.25″ |
| Watsonville, CA | 51,320 | 0.25″ |
| Brisbane, CA | 4,667 | 0.25″ |
Hail reports (4)
| Time (UTC) | Size | Location |
|---|---|---|
| 23:30 | 0.88″ | Tulare County, CA |
| 00:28 | 0.88″ | Kings County, CA |
| 23:26 | 0.25″ | Santa Cruz County, CA |
| 01:46 | 0.25″ | San Mateo County, CA |
Damage, injuries and deaths
National Weather Service offices recorded about $370,000 in property damage from hail, thunderstorm wind and tornadoes across the US on this storm day (27 events in 2 states). Injuries and deaths are those the events caused directly.
| County | Events | Injuries | Deaths | Property damage |
|---|---|---|---|---|
| Kings County, CA | 8 | 0 | 0 | $190,000 |
| Fresno County, CA | 6 | 0 | 0 | $120,000 |
| Inyo County, CA | 1 | 0 | 0 | $50,000 |
| Tulare County, CA | 1 | 0 | 0 | $10,000 |
What the National Weather Service wrote
- Kings County, CA (near Hanford Blair Arpt) · Thunderstorm wind 60 mph · $100,000
“Media report of a dairy farm south of Hanford having several barns with extensive roof damage from thunderstorm winds.” - Inyo County, CA (near Park Vlg) · Thunderstorm wind 100 mph · $50,000
“Thunderstorm winds blew the roof off one building, damaged five other roofs, and blew windows out of four vehicles.” - Kings County, CA (near Corcoran) · Thunderstorm wind 70 mph · $50,000
“Public report in Corcoran of Thunderstorm winds producing damage to a house and snapping several trees. Beams from a wood fence were snapped from from concrete support and shingles were blown off of a roof.” - Fresno County, CA (near Caruthers) · Thunderstorm wind 70 mph · $50,000
“Broadcast Media report of a chicken barn blown down by thunderstorm downburst outflow winds.” - Fresno County, CA (near Mendota) · Thunderstorm wind 70 mph · $30,000
“Media posted video showing 30 power lines downed in Mendota from a microburst.” - Tulare County, CA (near Tipton) · Thunderstorm wind 49 mph · $10,000
“California Highway Patrol reported several trees down on northbound State Route 99 just south of the State Route 190 interchange.”
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 September 11, 2017
National Weather Service survey teams mapped 5 tornado paths from this storm day (1 EF1, 4 EF0), 5 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 | 107 mph | 0.5 mi | 30 yd | 0 / 0 | 21:45–21:47 UTC | NWS Charleston, SC |
| EF0 | 85 mph | 2.0 mi | 50 yd | 0 / 0 | 23:01–23:04 UTC | NWS Columbia |
| EF0 | 84 mph | 1.5 mi | 60 yd | 0 / 0 | 18:48–18:50 UTC | NWS Charleston, SC |
| EF0 | 80 mph | 0.6 mi | 90 yd | 0 / 0 | 23:13–23:15 UTC | NWS Charleston, SC |
| EF0 | 83 mph | 0.1 mi | 55 yd | 0 / 0 | 22:19–22:21 UTC | NWS Charleston, SC |
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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