Napoleon, ND Hail Storm – August 2026

Napoleon, North Dakota experienced a concluded severe hail event on August 12, 2026, with peak hail measured at 3.41 inches by radar. The storm produced multiple NWS alerts and concentrated radar-detected hail across the Napoleon metro area in the early evening.

What Happened

The storm moved through Napoleon in the early evening of August 12. The NWS issued three sequential warning-area alerts tied to radar hail detections. At 5:29 PM CDT (22:29 UTC) radar indicated 1.73-inch hail within the NWS alert area. At 5:39 PM CDT (22:39 UTC) a second radar detection reported 1.68-inch hail in a nearby sector of the same warning area. At 5:54 PM CDT (22:54 UTC) radar detected 2.1-inch hail as the system intensified along its track. Dual-polarization radar consistently flagged large hail signatures during the alert sequence. Local NWS warning areas covered the storm path through central Napoleon and adjacent rural sections. The event is concluded and no active warnings remain for the area.

Damage Assessment

Radar-detected hail during the alert sequence ranged from roughly 1.7 to 2.1 inches across the NWS warning area before radar-derived processing recorded a larger return later in the track. Hail of that size can dent unprotected metal panels, fracture older asphalt shingles, and cause concentrated crop loss on exposed foliage in fields immediately under the hail track. Vehicle bodywork in parking areas along the storm path is at elevated risk for dents and broken glass. Roof coverings with prior wear are at greater risk for accelerated shingle loss where hail impacts were concentrated. Agricultural equipment left outdoors and greenhouse coverings in the storm path may show punctures or tears concentrated along the mapped track.

No field reports are included in this summary. Use on-site inspection and geotagged imagery to verify localized damage before estimating repair scope. Document every structure and vehicle in the affected address range with time-stamped photos. Prioritize inspections for municipal assets and high-value agricultural installations located inside the NWS warning area.

What Contractors Should Know

Begin with safety and triage. Confirm power is isolated and unstable roofing or glazing is secured before crews access properties. Use geotagged photos and concise condition tags for each structure to speed claims processing. For roofing, inspect for shingle granule loss, edge erosion, and penetrations under flashing. For vehicles, catalogue dents and glass damage with scale references. For crops, note defoliation percentage and fruiting structure impacts in field strips coincident with the radar-detected track.

Plan for staged mobilization. Prioritize municipal contracts and insured residential claims where damage is documented. Prepare tarping materials, temporary glazing supplies, and standard estimate templates aligned to measured hail sizes. Coordinate with insurers on documented inspection packets that include timestamps, GPS coordinates, and radar-derived hail track snapshots. Allow for follow-up visits to confirm secondary damage from runoff or wind following initial repairs.