Iowa Storm Data: Hail, Wind & Severe Weather
Deduplicated severe weather activity for Iowa, fused from NWS warnings, storm reports, official records, and FEMA declarations.
Iowa severe weather at a glance (last 12 months)
StormAuditor's consolidated public record currently shows 8,971 storm events impacting 99 of Iowa's 99 counties in the trailing 12 months: 4,627 wind events, 3,374 hail events, 548 tornado events, 429 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 Iowa storm days
- April 23, 2026 — 536 recorded events (flood, hail, tornado, wind)
- June 11, 2026 — 517 recorded events (flood, hail, tornado, wind)
- April 17, 2026 — 515 recorded events (flood, hail, tornado, wind)
- May 17, 2026 — 449 recorded events (flood, hail, tornado, wind)
- May 15, 2026 — 371 recorded events (hail, tornado, wind)
Most impacted counties
- Linn — 205 events (173 severe)
- Polk — 192 events (161 severe)
- Johnson — 184 events (152 severe)
- Sioux — 182 events (152 severe)
- Story — 166 events (142 severe)
- Scott — 165 events (133 severe)
- Woodbury — 160 events (149 severe)
- Marshall — 150 events (133 severe)
Additional activity recorded in NWS forecast zones: Obrien (18).
Download the Iowa dataset (free)
The full consolidated Iowa 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 Iowa 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 Iowa hail map and wind map, or check the county impact heatmap.
Iowa city storm pages: Des Moines hail & wind history · Cedar Rapids hail & wind history · Davenport hail & wind history · Sioux City hail & wind history · Ankeny hail & wind history · Iowa City hail & wind history · Ames hail & wind history · Marion hail & wind history · Marshalltown hail & wind history · Coralville hail & wind history
Neighboring states: Illinois storm data · Minnesota storm data · Missouri storm data · Nebraska storm data · South Dakota storm data · Wisconsin 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.