Casper, WY Hail Storm – September 2026

Casper, WY recorded a multi-zone hail event on September 19, 2026, producing up to 1.52-inch hail in the early evening. The storm concluded the same night after moving across the Casper metro.

What Happened

The event produced two NWS alert updates tied to a single storm complex over Casper. At 6:37 PM MDT (00:37 UTC) a warning reported radar-detected hail to 1.05 inches. At 6:59 PM MDT (00:59 UTC) a second warning reported radar-detected hail to 1.09 inches. Aggregated follow-up reporting established a maximum verified hail size of 1.52 inches within the Casper metro. The alerts and radar returns show the strongest activity during the early evening as the system moved eastward across the city.

Damage Assessment

Peak hail of 1.52 inches in Casper exceeds common automotive panel tolerances and is between quarter-sized (1.00 inch) and golf-ball-sized (1.75 inch) standards. For this event in Casper, expected impacts include denting and paint chipping on vehicles parked outdoors and localized damage to older or unprotected roofing materials. Exposed HVAC units, skylights, and soft-surface exterior finishes in the affected metro should be inspected for impact marks and punctures.

Document conditions before any repairs. Take wide and close photographs showing the measured hail size or a reference object. Record the location, time, and any visible penetration or displaced roofing material. This event’s hail magnitude increases the likelihood of cosmetic and secondary water intrusion issues where shingles or flashings were compromised.

What Contractors Should Know

Roofing teams should prioritize safety and rapid assessment. Conduct a secure perimeter inspection first, then move to detailed roof checks with fall protection in place. Look for bruised shingles, fractured tabs, broken vents, and displaced flashings. Photograph all findings with a scale and timestamp. Separate temporary tarps from permanent repairs in reporting. Order common replacement materials early if multiple structures show similar exposure.

Exterior and glass contractors should evaluate vehicles, siding, gutters, and skylights for panel dents, cracked glazing, and seal failures. Document mechanical equipment for dents or damaged coils that could affect performance. Communicate clearly with property owners about temporary stabilization versus full replacement. Coordinate with insurers and adjusters and retain all inspection records for claims support.

Paid subscribers can view the Strike Map for the radar-confirmed hail swath and the mapped damage zone for the Casper metro.