Geraldine, MT Hail Storm – September 2026

Geraldine, MT experienced a brief severe storm in the early evening of September 13, 2026. Radar-verified hail reached 0.84 inch as the cell moved through the local warning area.

What Happened

The cell generated a National Weather Service warning area issued at 9:02 PM MDT on September 13, 2026, citing 1 inch hail potential. Dual-polarization radar detected intense hail-sized returns later that evening, with a radar hail signature noted at 9:28 PM MDT. Storm motion was confined to the immediate Geraldine warning area and the event is concluded.

The alert sequence began with the NWS warning area and was followed by radar detection that corroborated the threat. The warning area covered addresses and roads in and around Geraldine while radar-derived hail detections mapped a tighter swath within that polygon. Observations used here reflect the NWS warning area and radar-derived hail detection points.

Damage Assessment

Hail at the size observed in Geraldine typically produces cosmetic to moderate impacts on vulnerable surfaces. Vehicles parked without cover are most likely to show dents to body panels and surface paint chips. Exterior soft siding and unprotected skylights are also at elevated risk of cosmetic damage.

Residential composite shingle roofs generally resist fracture at this size, but older or mechanically weakened shingles can incur bruising or granule loss. For agricultural interests, unprotected seedlings and tender foliage in exposed fields can sustain foliar scarring and localized crop stress. No spotter-verified damage reports are part of this summary; damage potential is presented as size-linked vulnerability rather than verified loss.

What Contractors Should Know

Inspect vehicles and exterior equipment first. Photograph damage with a scale reference and log GPS coordinates inside the NWS warning area. Use multiple angles and dated imagery to document dents, paint loss, and any glass or skylight impairment. For roofing, perform a close visual inspection from the ground and a selective rooftop survey only after verifying footing and ladder safety. Note granule loss, bruised shingles, and any exposed underlayment.

Prioritize repairs by safety and water intrusion risk. Tarp compromised roof areas when active leaks are present. For claims and estimates, separate cosmetic denting from structural impairment in line-item photos and descriptions. Coordinate with property owners on temporary protection to prevent secondary water damage. Field teams should carry lighting and weather-resistant documentation tools and avoid overextending crews on soft or saturated soils in rural parcels.

See the Strike Map for the radar-confirmed hail swath.