Merrill, WI Hail Storm – August 2025

Merrill, WI saw a concluded hail storm on August 9, 2025, with a maximum confirmed hail size of 1 inch. The storm moved through the area in the morning and was verified by radar and spotter reports.

What Happened

A severe thunderstorm warning covered the Merrill area at 7:33 AM CDT on August 9. The alert called for 1 inch hail and was supported by radar and spotter verification. No additional alerts were recorded for this storm, and the event is now concluded.

The timing points to an early morning hail threat rather than a long-lived afternoon line. The verified hail size stayed at 1 inch, which places this event in the quarter-size-to-egg-size range that contractors and property owners track closely during exterior inspections.

Radar confidence remained high enough to support the report as a verified hail event rather than a broader, unconfirmed severe-weather signal. The warning area covered Merrill and nearby locations in the storm path.

Damage Assessment

One-inch hail can affect roofs, siding, gutters, vents, skylights, and soft metals. On asphalt shingles, impacts at this size may remove granules, bruise the mat, or leave scattered fracture points that are not visible from the ground. On metal surfaces, dents often appear on downspouts, flashing, trim coil, window wraps, garage doors, and roof accessories.

Vehicles parked outdoors can show concentrated dents on hoods, roof panels, mirrors, and tailgates. Vinyl siding and fascia may show impact marks where wind-driven stones struck exposed faces. Screens, patio covers, and lightweight exterior components can also take isolated damage where the storm core passed.

The hail size matters for inspection scope. At 1 inch, damage is often selective rather than uniform. One roof section may show clear impact marks while another nearby roof line shows little visible change. Elevation, roofing age, slope, and surrounding tree cover all affect what is documented in the field.

For contractors, the main task after a verified 1 inch hail report is to separate storm-related impact from wear, prior repair, and unrelated wind damage. Crews should look for fresh granule loss, impact bruising, soft-metal deformation, screen punctures, and consistent strike patterns on the same exposure faces.

What Contractors Should Know

The early morning timing matters for access and documentation. Before inspections begin, confirm the address sits inside the warning area and record the storm date, local arrival window, and observed impact points. Use wide photos first, then closer roof and elevation images. Ground-level photos should include gutters, downspouts, window trim, and any exposed metal that shows denting.

Field teams should expect mixed conditions at this size. Some properties will show clear impacts on soft metals and accessories while roof coverings appear lighter at a glance. That does not rule out roof damage. It means the inspection has to focus on pattern, frequency, and fresh impact characteristics, not only on visible cosmetic marks.