StormProof → hail seasons → Sioux Falls → 2009
Sioux Falls hail season 2009
12 NWS-recorded hail reports ≥1″ within 25 miles, across 5 storm days, max 1.75". Every one of those reports is a dated, located, citable official record — the context behind this market's 2009 claim volume.
Biggest storm days (2009, final record)
| Date | ≥1″ reports | Max hail | Areas named in the record |
|---|---|---|---|
| July 7, 2009 | 6 | 1.75" | LINCOLN, MINNEHAHA |
| August 19, 2009 | 2 | 1.25" | SIOUX, LINCOLN |
| August 8, 2009 | 2 | 1.75" | MCCOOK, MINNEHAHA |
| July 9, 2009 | 1 | 1.00" | LYON |
| June 24, 2009 | 1 | 1.00" | TURNER |
“Large hail accumulated to a depth of up to 2 inches. The hail severely damaged soybean crops and caused lesser damage to corn crops. The amount of crop damage was not known.”
— NWS event narrative, July 7, 2009 (NCEI Storm Events)
When it fell
Jun 1 · Jul 7 · Aug 4
Wind context: the record also holds 11 thunderstorm-wind events ≥50 kt (≈58 mph, the NWS severe criterion) in this radius for 2009 — relevant where the dispute is wind vs hail causation.
Working a Sioux Falls claim from 2009?
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.