Eureka, SD Hail Storm – July 2026

Eureka, SD experienced a multi-zone hail-producing thunderstorm on July 7, 2026, producing peak hail of 2.39 inches. The storm moved through mid-morning and concluded by late morning with multiple radar-detected alerts and a final NWS warning-only alert.

What Happened

The event began with a radar-detected hail alert at 8:53 AM CDT. Dual-polarization radar indicated hail near 1.15 inches within the first warning area. Six minutes later, at 8:59 AM CDT, radar again detected larger hail near 1.25 inches as the system progressed east-northeast through adjacent warning areas. A later radar-detected alert at 9:36 AM CDT showed hail near 1.46 inches while the core passed closer to central Eureka. The sequence ended with an NWS warning-only alert at 10:29 AM CDT that reported 0.75-inch hail in a trailing cell.

The alerts covered multiple NWS warning areas across and around the Eureka metro. Radar-detected returns defined the main hail swath. The final warning was issued as a precaution for a weakening cell that still posed a threat to exposed property.

Damage Assessment

Radar-detected hail ranged from approximately 0.75 to 1.46 inches during the alert sequence across most warning areas. Peak hail reached 2.39 inches within the broader storm footprint. Hail in the 0.75–1.25 inch range commonly produces cosmetic and paint damage to vehicles and can bruise soft vegetation along the swath detected in early alerts. Hail sized around 1.25–1.75 inches increases the likelihood of shingle granule loss and denting on aluminum siding and metal fixtures. The event’s largest hail size indicates an elevated risk for broken skylights, cracked solar panels, and significant denting to parked vehicles in the immediate path of the largest stones.

Damage reports should be prioritized by location and exposure. Vehicles left outdoors in the mid-morning core and structures with south- and west-facing exposures in central Eureka are at greatest risk given the storm progression. Localized impacts are likely to be clustered along the radar-detected swath rather than uniformly distributed across the entire warning areas.

What Contractors Should Know

Inspect roofs first on properties located along the mid-morning core path and on any sites reporting water intrusion. Focus on asphalt shingle edges, ridge caps, skylights, gutters, and flashing. Look for granule loss patterns, fractured shingle tabs, and indentations consistent with 1.25–2.39 inch impacts. Photograph damage with scale references and note the location relative to the storm’s passage time for claims documentation.

Assess vehicles and outdoor equipment next. Check for dents, cracked glass, and damaged siding on outbuildings. For solar arrays, inspect cells and mounting hardware for point impacts and microfractures. Prioritize work orders by verified location within the radar-detected swath and by reported exposure. Use caution during inspections; some roofs may have hidden structural compromises after large impacts.