Oshkosh area, August 18, 2026: spotters filed 2 hail reports in Fond du Lac County, at 21:50 UTC. Hail peaked at 1.00 in. at 1 SSE Fond Du Lac, Fond du Lac County. The closest report fell 14.4 miles from the Oshkosh city center (1 NE Fond Du Lac).
Where the hail fell
- under 0.75 in
- 0.75 to 0.99
- 1.00 to 1.74
- 1.75 to 2.49
- 2.50 and up
How many reports fell close to the city
| Distance from city center | Reports | Largest hail |
|---|---|---|
| Within 5 miles | 0 | — |
| Within 10 miles | 0 | — |
| Within 25 miles | 2 | 1.00″ |
Reported hail, report by report
| Time (UTC) | Hail size | Location | Distance from city center |
|---|---|---|---|
| 21:50 | 1.00″ | 1 SSE Fond Du Lac, Fond du Lac County | 15.7 mi |
| 21:50 | 1.00″ | 1 NE Fond Du Lac, Fond du Lac County | 14.4 mi |
The rows above come from preliminary Local Storm Reports of the NOAA Storm Prediction Center. Sizes are reported hailstone diameters; times are UTC. Reports can be added or corrected for about a day after the event. Where a report carries no distance, it is measured in a straight line from its coordinates to the city center.
What 1.00 in. hail on August 18, 2026 means for a Oshkosh roof
2 of the 2 sized Oshkosh reports reached 1 in. The 1.00 in. stone at 1 SSE Fond Du Lac, Fond du Lac County falls in the 1.00 to 1.74 in class; on August 18, 2026 that is quarter to ping-pong ball territory for Oshkosh.
What spotters wrote
1.00″, 1 SSE Fond Du Lac at 21:50 UTC: Spotter report of quarter sized hail in Fond du Lac.
1.00″, 1 NE Fond Du Lac at 21:50 UTC: Delayed Storm Report. Quarter sized hail.
How this day compares with other hail days
Oshkosh has 2 hail days in our NOAA log; by largest hailstone, August 18, 2026 ranks #2 of them. Logged days closest in time to August 18, 2026:
- July 1: 18 reports, largest 3.25″
The same storm in nearby cities
August 18: 6 cities in 3 states drew SPC hail reports. La Crosse, WI lies closest to Oshkosh, 135 miles west, with 2 reports, largest 1.25 in. 2 cities lie within 220 miles of Oshkosh with hail reports on August 18.
| City | Distance | Reports | Largest hail |
|---|---|---|---|
| La Crosse, WI | 135 mi west | 2 | 1.25″ |
| Rochester, MN | 195 mi west | 2 | 1.00″ |
2 nearest to Oshkosh, within 220 miles; each link opens that city’s list for August 18, 2026.
Where the claim clocks stand for the Oshkosh storm
Oshkosh: that storm was 68 days ago. Rows marked passed are not cut-off dates on their own; the only legal limits are the ones tagged statute. For Oshkosh the photo window, the inspection and the target filing date (Tue, Aug 25) are already behind us.
Claim deadlines for Oshkosh, WI. Not legal advice; your own reporting deadline comes from your policy.
August 18 against the Winnebago County August record
Oshkosh's August 18 log shows 1.00 in. hail. The record August in Winnebago County since 2014 is 2015, with 3 reports and a largest stone of 1.00 in.
Hail history near Oshkosh: not the first
Oshkosh’s county has logged 15 hail events since 2017; if this one leads to a replacement, ask about Class 4 impact-resistant shingles, which some insurers discount. Check your own address on the hail risk lookup.
See all roofing contractors in Oshkosh, WI
What the sizes reported on August 18, 2026 can do to a roof
| Size class in Oshkosh's reports | Looks like | Reports | What that size can do |
|---|---|---|---|
| 1.00 to 1.74 in | quarter to ping-pong ball | 2 | Shingles can bruise and shed granules, often unseen from the ground. |
Size classes follow the SPC report diameters; the damage wording is general, not a finding about any one roof.
2026 in the Winnebago County hail record
NOAA's county table already holds 2 hail reports for Winnebago County in 2026 through June 2026, with a largest stone of 1.00 in. That is more than 3 of the 7 full years before it. The busiest full year in the table is 2020 with 4 reports.
| Year | NOAA hail reports, Winnebago County | Largest stone |
|---|---|---|
| 2017 | 1 | 0.75″ |
| 2018 | 2 | 1.00″ |
| 2020 | 4 | 1.00″ |
| 2021 | 2 | 1.00″ |
| 2023 | 2 | 1.00″ |
| 2024 | 1 | 1.00″ |
| 2025 | 1 | 0.88″ |
| 2026 (through June 2026) | 2 | 1.00″ |
This date among 2026's matched hail days
In 2026 the feed holds 2 matched hail days for Oshkosh. Ranked by largest stone, then report count, August 18, 2026 is #2 of them.
| Date | City | Reports | Largest hail |
|---|---|---|---|
| Jul 1 | Oshkosh | 18 | 3.25″ |
| Aug 18 | Oshkosh | 2 | 1.00″ |
Ranked by largest stone, then by report count. Only dates the SPC feed matched to a covered city are counted.
The week after August 18, 2026
The SPC feed matched no hail report to Oshkosh or to the 4 other covered cities within 100 miles on any of the 7 days after Tue, Aug 18, through Tue, Aug 25.
Questions about this storm
Oshkosh, August 18, 2026: how big was the hail?
At 1 SSE Fond Du Lac, Fond du Lac County, the largest SPC report was 1.00 in.
Oshkosh, August 18, 2026: how close did the hail fall?
The nearest report sat 14.4 miles from the city center and the farthest 15.7 miles. Within 10 miles: 0 of 2 reports.
Oshkosh, August 18, 2026: how long did the hail last?
Reports are stamped from 21:50 to 21:50 UTC. Late reports can still be added for about a day.
Oshkosh, August 18, 2026: was this the worst hail day on record?
Oshkosh has 2 logged hail days; August 18, 2026 ranks #2 for Oshkosh, at 1.00 in. The best other day reached 3.25 in.
Do I need an inspection if my roof looks fine?
Often, yes. Hail bruises and granule loss are hard to see from the ground. A dated inspection scope is what ties damage to this storm rather than to ordinary wear.
Did the same storm hit towns near Oshkosh on August 18, 2026?
The feed shows hail reports that day in La Crosse, WI (135 miles west, 2 reports, up to 1.25 in.); Rochester, MN (195 miles west, 2 reports, up to 1.00 in.).
What did the feed log near Oshkosh in the week after August 18, 2026?
The SPC feed matched no hail report to Oshkosh or to the 4 other covered cities within 100 miles on any of the 7 days after Tue, Aug 18, through Tue, Aug 25.
Was 2026 a busy hail year in Winnebago County?
NOAA's county table already holds 2 hail reports for Winnebago County in 2026 through June 2026, with a largest stone of 1.00 in. That is more than 3 of the 7 full years before it. The busiest full year in the table is 2020 with 4 reports.
About these numbers
Every figure on this page comes from the NOAA Storm Prediction Center Local Storm Reports file, matched to reports within 25 miles of the city center. Reports are preliminary: they come from trained spotters, emergency managers, the public and mPING app submissions, and sizes are often estimated against a coin or ball. We do not adjust them. A roofer tagged Verified holds a license or registration we confirmed in a public registry. That tag says nothing about coverage, so ask whoever you pick for a current certificate of insurance before signing.
More Resources
All recent local hail · Roofing contractors · Insurance claim guide · Roof replacement costs here · Emergency roof repair