Mill Creek, OK Hail Storm – August 2026

Mill Creek, OK experienced a late-afternoon hail event on August 17, 2026 that produced up to 1-inch hail and prompted a single NWS warning area. The storm is concluded.

What Happened

A single NWS severe thunderstorm warning was issued for the Mill Creek area at 5:24 PM CDT (22:24 UTC) on August 17, 2026. The warning text specified 0.75-inch hail and carried NWS warning only confidence. Reports and post-event review indicate hail reached up to 1 inch in diameter across the zone covered by this single-zone storm report.

The event occurred in the late afternoon and moved through the immediate Mill Creek metro footprint without subsequent warnings. No additional NWS alerts were issued for adjacent zones. This report summarizes the warning sequence and on-the-ground size information for Mill Creek only.

Damage Assessment

Stones in the three-quarter to one-inch range commonly produce paint and dent damage to unprotected vehicles. Vulnerable surfaces include aluminum siding, exposed HVAC units, and parked cars in open lots. Asphalt shingles, particularly older or weathered installations, can sustain bruising that may accelerate granule loss and shorten remaining service life.

Initial response data did not include widespread structural collapse or catastrophic failures within Mill Creek. Inspections should prioritize vehicle fleets, rooftop coverings, skylights, and rooftop-mounted equipment. Document all findings with date-stamped photos and note exposure times for any items left uncovered during the late-afternoon event.

What Contractors Should Know

Conduct a focused exterior survey along the storm’s path in Mill Creek. Begin with vehicle inspections for dents and cracked glass. Next, inspect roofing for bruised shingles, split seals around penetrations, and displaced flashing. Check gutters and low-lying drains for hail accumulation and trapped debris that could influence runoff.

For roofing clients, differentiate cosmetic bruising from granule loss that warrants repair or replacement. Use high-resolution photos and measure affected areas before submitting estimates. For claims work, document pre-existing conditions and provide clear comparisons to pre-storm imagery when available. Coordinate safety protocols for crews working on wet or debris-covered surfaces.

See the Strike Map for precise hail track data.