Verified storm · closed
1.1–1.8" hail crossed Marathon County, WI — August 12, 2026
Measured against the NOAA MRMS national radar feed on its 2-minute cycle — a verified event, not a forecast.
Storm stats
| County | Marathon County, WI |
|---|---|
| Max hail (MESH) | 1.8" |
| Mean hail (MESH) | 1.1" |
| Swath area | 63 mi² (163 km²) |
| Radar cells (~1 km grid) | 186 |
| First radar detection | 2026-08-12 04:36 UTC |
| Last radar detection | 2026-08-12 05:42 UTC |
| Verified | 2026-08-12 04:38 UTC |
| Swath centroid | 44.8535, -90.0960 |
| Storm ID | sw_689a65da |
Free address check
Was your address under this swath?
Enter any US address — we check it against every storm we've verified, this one included. Free, no login, storm history only.
US ADDRESSES · GEOCODED VIA US CENSUS · FULL HISTORY TOOL →
Every roof under this swath, one API call.
Get the property list for this storm — every affected parcel with roof age, owner-occupancy, and measured hail exposure. Free API key, 100 credits, no card.
curl "https://swathapi.com/v1/swaths/sw_689a65da/properties?roof_age_min=10" \ -H "Authorization: Bearer sk_..."
ASK CLAUDE OR CHATGPT ABOUT THIS STORM — SWATH WORKS INSIDE YOUR AI. CONNECT THE MCP SERVER
Want this every morning?
The Daily Swath — every verified storm, mapped, in your inbox at 9am ET.
Marathon County, WI — verified storm record
Swath has 15 radar-verified hail storms on record for Marathon County, WI going back to July 2025, the largest measuring 2.99″. Every one was measured against NOAA MRMS radar — not estimated, and not a forecast.