Green River, UT Hail Storm – September 2026

Green River, UT experienced a concluded hail event on September 12, 2026, with a radar-detected peak hail size of 2.13 inches. The storm produced multiple NWS alerts during the early evening and moved across the metro area before dissipating.

What Happened

The event unfolded in the early evening hours of September 12. NWS issued two sequential alerts tied to the same multi-zone storm. At 8:00 PM MDT, radar indicated hail near 1.75 inches and NWS issued an alert for that threat within the warning area. At 8:26 PM MDT, a follow-up alert noted 1.00-inch hail within the broader warning area. NEXRAD dual-polarization radar tracked the hail cores that produced these alerts and identified a peak radar-detected return equivalent to 2.13 inches as the storm passed over Green River and adjacent areas. The sequence reflects an aggregate analysis across multiple warning polygons for this event. The storm concluded in the late evening and no active alerts remain for the area.

Damage Assessment

Observed hail sizes ranged from about 1.00 inch to a radar-equivalent peak of 2.13 inches. On the NWS object scale, 1.75 inches equals a golf ball and 2.75 inches equals a baseball; the peak size in this event was larger than a golf ball and smaller than a baseball. Hail in this size range can cause localized shingle granule loss, bruising or punctures in asphalt shingles, denting to metal siding and aluminum gutters, and visible dents on vehicle panels. Skylights, exterior HVAC housings, and exposed solar arrays are also vulnerable to impact damage when hail exceeds roughly 1.5 inches in diameter.

There are no ground-verified damage reports included in this radar-derived summary. Property owners in the Green River city limits and nearby unincorporated areas that fell inside NWS alert areas should inspect roofs, vehicle surfaces, and outdoor equipment for impact marks and brittle granule loss. Note the times of the NWS alerts when documenting observed damage for claims or repairs.

What Contractors Should Know

Prioritize exterior assessments in areas covered by the September 12 NWS alerts. Start with roof inspections focused on shingle granule loss, split or punctured shingles, and softened underlayment around penetrations. Photodocumentation should include a close-up of damage, a wide shot showing location context, and a time-stamped image or note. For vehicles and metal-clad elements, measure and catalog dents rather than relying on visual estimates only.

Provide clear, time-bound scopes for customers. Recommend temporary tarping only where active leaks are present or where interior exposures justify immediate intervention. Coordinate with adjusters and advise clients to preserve undisturbed evidence for insurance review. Use the NWS alert times and the radar-detected size range when preparing estimates and inspection reports.