Estherville, IA Hail Storm – September 2026

A hail-producing storm tracked through Estherville, Iowa, on September 6, 2026, producing stones up to 2.22 inches and a concentrated radar-detected hail swath across the metro.

What Happened

A sequence of 33 NWS alerts spanned from mid-morning into late evening on September 6, beginning with a radar-detected report at 10:45 AM CDT and continuing through an 11:29 PM CDT warning-only alert. The event intensified in the late afternoon and early evening with multiple dual-polarization radar detections showing elevated hail sizes. Notable radar-detected returns included 1.6 inches around 3:45 PM CDT, 2.06 inches at 6:56 PM CDT, and another 2.06-inch detection at 9:26 PM CDT, supplemented by several other radar-detected reports between those times. Many intervening NWS warning-area alerts reported smaller hail sizes without radar confirmation.

Field observers provided on-the-ground detail in the early evening window. At 6:33 PM CDT and 6:38 PM CDT, mPING and public reports recorded quarter-sized stones in the central metro. At 6:57 PM CDT a spotter described "Picture ping pong ball hail north of Exit 68 on I-35," with the submitter estimating time from radar. Those spotter-verified observations align with the radar-detected hail swath that crossed the I-35 corridor and adjacent Estherville neighborhoods during the 6:30–7:00 PM CDT period.

Damage Assessment

Local Storm Reports and public submissions documented surface impacts concentrated along the I-35 corridor north of Exit 68 and within the Estherville metro. The three spotter-verified entries in this dataset recorded hail on the interstate corridor and in the central metro; none of the provided Local Storm Reports in this collection included descriptions of structural collapse or large-area catastrophic loss. The 6:57 PM CDT spotter observation explicitly located significant stone impacts north of Exit 68 on I-35. The two mPING quarter-size reports at 6:33 PM CDT and 6:38 PM CDT overlap the same central metro footprint identified by radar.

Observed signatures to expect along the reported track include concentrated vehicle panel dents and localized roofing bruising where quarter-size and larger stones were reported. Reports and radar echoes indicate the highest impact density along the mapped hail swath that tracked across the interstate and through the downtown-perimeter zone. Claim adjusters and field teams operating in those corridors should assume a non-uniform pattern of damage, with focused clusters near the strongest radar returns and the spotter locations cited above.

What Contractors Should Know

Prioritize inspections on properties within the radar-detected swath and along I-35 north of Exit 68. Start with vehicle fleets and parked cars in public lots adjacent to the interstate and in downtown Estherville. Photograph vehicle roofs, hoods, and glass with time-stamped images. Record exact locations and reference the 6:33–6:57 PM CDT window when spotter reports and radar returns overlapped.