Wisconsin Storm Data: Hail, Wind & Severe Weather
Deduplicated severe weather activity for Wisconsin, fused from NWS warnings, storm reports, official records, and FEMA declarations.
Wisconsin severe weather at a glance (last 12 months)
StormAuditor's consolidated public record currently shows 5,336 storm events impacting 72 of Wisconsin's 72 counties in the trailing 12 months: 2,031 wind events, 2,464 hail events, 338 tornado events, 503 flood events. Events are fused from National Weather Service warnings and Special Weather Statements, observed Local Storm Reports, official NCEI storm records, and FEMA disaster declarations, then consolidated into a single event table under the published methodology. Because a single storm can carry more than one hazard tag (a squall line can produce both wind and flood records), the per-type counts can legitimately add up to more than the consolidated total. Sub-severe statements (radar-indicated gusts of 40+ mph or hail of 0.5"+) are included at a distinct moderate tier and never counted as severe.
Biggest Wisconsin storm days
- April 14, 2026 — 644 recorded events (flood, hail, tornado, wind)
- April 17, 2026 — 562 recorded events (flood, hail, tornado, wind)
- April 13, 2026 — 378 recorded events (flood, hail, tornado, wind)
- June 10, 2026 — 332 recorded events (flood, hail, tornado, wind)
- July 27, 2026 — 283 recorded events (flood, hail, tornado, wind)
Most impacted counties
- Dane — 298 events (240 severe)
- Marathon — 178 events (128 severe)
- Rock — 170 events (118 severe)
- Dodge — 154 events (111 severe)
- Fond du Lac — 148 events (105 severe)
- Walworth — 148 events (101 severe)
- Waukesha — 145 events (101 severe)
- Racine — 134 events (82 severe)
Additional activity recorded in NWS forecast zones: Oneida Indian Reservation (1).
Download the Wisconsin dataset (free)
The full consolidated Wisconsin event list for the trailing 12 months — dates, counties, hazard types, severities, measured gusts and hail sizes, with coordinates; source records deduplicated, and each NWS warning product listed per affected county — downloads free and stays current with the live record: download CSV · download JSON. Reusable with attribution under the data license; the JSON file carries a field dictionary and provenance notes.
Research a specific Wisconsin address
Statewide counts tell you where activity concentrated; they do not tell you what happened at one property. For an individual address, run the Free Report Snapshot (an instant YES/NO against StormAuditor's screening thresholds — wind ≥ 45 mph, hail ≥ 0.75 in., deliberately below the official NWS severe criteria), use the Address Lookup, or purchase a full Weather Report for $2.99 covering every qualifying storm date at the address. Browse day-by-day activity on the Storm Calendar or compare states on the Storm Data hub.
All values are derived from public NOAA and NWS data under StormAuditor's published methodology. They are research estimates, not certified weather records — see Limitations. Data last refreshed September 6, 2026.
See where recent storms tracked on the statewide Wisconsin hail map and wind map, or check the county impact heatmap.
Wisconsin city storm pages: Milwaukee hail & wind history · Madison hail & wind history · Green Bay hail & wind history · Kenosha hail & wind history · Racine hail & wind history · Appleton hail & wind history · Waukesha hail & wind history · Eau Claire hail & wind history · Janesville hail & wind history · Mount Pleasant hail & wind history
Neighboring states: Iowa storm data · Illinois storm data · Michigan storm data · Minnesota storm data
About this page: built by Storm Auditor LLC from public NOAA/NWS records — deduplicated warnings, storm reports, station measurements, and official records on a rolling 12-month window, under the published methodology. See the StormAuditor Editorial Team for how content is produced.