StormProof → hail seasons → Sioux Falls → 2021
Sioux Falls hail season 2021
33 NWS-recorded hail reports ≥1″ within 25 miles, across 6 storm days, max 4.00". Every one of those reports is a dated, located, citable official record — the context behind this market's 2021 claim volume.
Biggest storm days (2021, final record)
| Date | ≥1″ reports | Max hail | Areas named in the record |
|---|---|---|---|
| August 28, 2021 | 12 | 4.00" | LINCOLN, LYON, ROCK, MCCOOK |
| April 5, 2021 | 9 | 1.75" | LINCOLN, LYON, MINNEHAHA |
| August 5, 2021 | 8 | 3.50" | MINNEHAHA |
| July 9, 2021 | 2 | 1.00" | MINNEHAHA |
| August 26, 2021 | 1 | 1.75" | LYON |
“Multiple pictures received of very large hail around Larchwood. Hail size ranged from tennis ball to as much as 4 inches in diameter. Several cars and houses reported to have all windows broken out. Property damage costs are a rough estimate.”
— NWS event narrative, August 28, 2021 (NCEI Storm Events)
When it fell
Apr 9 · Jul 2 · Aug 22
Wind context: the record also holds 54 thunderstorm-wind events ≥50 kt (≈58 mph, the NWS severe criterion) in this radius for 2021 — relevant where the dispute is wind vs hail causation.
Working a Sioux Falls claim from 2021?
These are aggregates. A claim file needs the per-address record: every recorded event within 1, 3 and 10 miles of the property, distances, official narratives, and citations an adjuster can check line by line. That's the report — generated in seconds, hosted on HailEvidence (the neutral evidence surface), formatted as an insurance-appeal attachment.
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Provenance
Final counts: NCEI Storm Events Database, file vintage c20260527, hail events with recorded magnitude ≥1.00″ and point coordinates within 25 miles of the Sioux Falls anchor. NWS records are point and path observations. The absence of a nearby report does NOT prove that no hail fell at this address — it means no observation was logged nearby. A report of nearby hail documents the event; it does not by itself prove damage to a specific structure. Spotted an error? Email the address on our terms page and we correct against the source.