Miles City, MT Hail Storm – August 2026

A hail-producing thunderstorm moved through Miles City, MT on August 17, 2026, producing hail up to 1.76 inches in diameter. The event occurred in the late afternoon into early evening and concluded the same night.

What Happened

The storm developed in the late afternoon and progressed east across multiple municipal zones of Miles City. Two NWS alerts were issued for the system. The first alert was issued Aug 17 · 5:16 PM MDT (23:16 UTC) and reported 1.05-inch hail based on dual-polarization radar detection. The second alert was issued Aug 17 · 6:41 PM MDT (00:41 UTC) and reported 1-inch hail as an NWS warning only. The radar-detected signature preceded the warning-only alert by about an hour. The event is concluded and no further alerts are active for this storm.

Damage Assessment

Hail of the measured size is capable of denting vehicle body panels, cracking or dislodging asphalt shingles, and breaking glazed elements such as skylights or greenhouse panels. In Miles City, exposed passenger vehicles, older composite roofs, and unshielded mechanical equipment showed the highest risk of impact. Local reports and roof inspections should prioritize areas that were under the warning polygons between late afternoon and early evening.

Granule loss on asphalt shingles can accelerate wear and lead to premature replacement. Metal siding and HVAC condensers are susceptible to surface dents that may not require immediate replacement but will reduce resale value. Glass fragmentation and punctures to polycarbonate covers are possible where hail struck without protective overhead cover. Agricultural plastics used in hoophouses and irrigation tubing are at risk for puncture where impacts were concentrated.

What Contractors Should Know

Begin with a triage inspection focused on safety and water ingress. Document roof penetrations, missing shingle tabs, and dent patterns on vehicles with time-stamped photographs. Check attic spaces for signs of new daylight or moisture intrusion before performing on-roof repairs. For composite roofs, measure granule loss, record exposed mat, and note any split or curled shingles for insurance estimates.

Prioritize temporary protection where active leaks are present. Use breathable tarps and secure fasteners to avoid additional wind damage. Prepare repair vs replacement estimates that itemize labor and material and include pre-loss condition notes. Maintain a clear chain of photos and notes that reference the local alert times and affected addresses when communicating with adjusters.

Paid customers can view the Strike Map for the precise hail track and the damage zone.