Grenville, NM Hail Storm – September 2025

Grenville, NM saw a concluded hail storm on September 20, 2025, with verified hail up to 1 inch. The storm produced one NWS alert at 3:54 PM MDT.

What Happened

The storm crossed the Grenville area late in the afternoon and ended as it moved away. The only NWS alert tied to this event came at 3:54 PM MDT, when dual-polarization radar confidence supported a 1-inch hail threat in the warning area.

That alert placed the storm in the range of quarter-sized hail. The event remained a single-zone hail report with one alert total. No additional alerts were issued for this storm after the 3:54 PM MDT notice.

The hail threat stayed focused on Grenville and nearby exposed property within the warning area. The verified peak hail size reached 1 inch.

Damage Assessment

Hail at 1 inch can break soft roofing materials, mark painted surfaces, and damage vehicle glass and trim. It also leaves dents on gutters, roof vents, air-conditioning fins, and metal flashings.

On homes, the first inspection points are usually roof slopes, ridge caps, skylights, and soft metals. On commercial sites, contractors should check membrane seams, rooftop equipment, and drainage components. Even when visible roof loss is limited, impact points can still be present on vents, downspouts, and exposed panels.

For this storm, the damage pattern should be read as localized rather than broad. A one-inch hail report points to isolated impact risk across the alert area, with the highest concern on unprotected surfaces and older exterior materials. Fresh bruising on shingles may be present even where interior leaks have not yet appeared.

Vehicle claims should focus on horizontal surfaces and glass. A brief 1-inch hail event can leave concentrated dents on hoods, roofs, and tailgates. Open lots, dealership inventory, and fleet vehicles parked outside during the storm should be checked first.

What Contractors Should Know

Start with roof slope, then move to soft metals and perimeter details. On residential work, document ridge caps, step flashing, pipe boots, and any roof-to-wall transitions before lifting materials or committing to repairs. On commercial sites, inspect HVAC fins, exposed conduit, and edge metal. If the building has a mix of materials, the hail exposure is often uneven across the same site.

Field crews should also separate cosmetic marks from functional damage. On metal components, dents may be visible without immediate failure. On shingles, impact points can be harder to confirm from the ground. Use close photos, note orientation, and match findings to the storm timing on September 20, 2025. In single-zone events like this, localized damage can be easy to miss if crews only cover the most visible surfaces.

Track nearby roofs, vehicles, and soft-metal components within the warning area first, then expand to secondary structures and outbuildings. A short storm window can still leave concentrated impacts on the most exposed assets.