Winthrop, IA Hail Storm – June 2025

Winthrop, IA saw a concluded hail storm on June 16, 2025, with a maximum confirmed hail size of 1 inch. The alert area included one verified severe hail alert at 2:16 PM CDT.

What Happened

The storm moved through Winthrop in the afternoon. NWS alert coverage identified 1-inch hail at 2:16 PM CDT, with dual-polarization radar support for the hail signal in the warning area.

This was a single-zone event. No additional hail alerts were included in the storm record for this location on June 16.

Radar confidence was tied to dual-polarization detection from NEXRAD hail analysis. The alert data placed the hail threat in the local warning area during the mid-afternoon window.

Damage Assessment

One-inch hail can leave visible marks on soft metals, asphalt shingles, vehicle glass, and outdoor equipment. Field crews should check for bruised siding, cracked roof accessories, dented trim, and roof surface loss on aging or exposed materials.

On homes with recent wear, granule loss may be more apparent than a clean puncture. On newer roofs, the same hail size can still produce collateral hits on vents, ridge caps, and ridge-adjacent flashing. Metal surfaces often show the fastest evidence, including gutters, downspouts, and AC condenser fins.

Inspect the full exterior path, not just the roof slope most exposed to the wind. Detached structures, porch covers, window screens, and parked vehicles can show the earliest field signs after a 1-inch hail event.

What Contractors Should Know

Treat this as a focused canvass zone in Winthrop, not a broad countywide hail claim cluster. Start with roofs on the side of the storm approach, then move to accessories and soft metals before closing out each property. Pay close attention to older shingle systems, exposed fasteners, and low-slope transitions where hail evidence can be clearer.

Document impact marks with close-range photos and roof-plane context. Check for uniform bruising, fractured tabs, soft metal deformation, and fresh scuffing on vents or flashing. On metal components, separate hail strikes from pre-existing wear and wind-driven contact. On vehicles and exterior trim, record each dented surface before cleanup or temporary protection begins.

Scope jobs with the local weather window in mind. A single 1-inch hail alert can still produce mixed conditions across short distances, so each address needs its own exterior review. If roof evidence is limited, use siding, window screens, gutters, and patio covers to build the field file.

For precise hail track data, see the Strike Map.