Merrimac, MA Hail Storm – July 2026

A hail-producing thunderstorm moved through Merrimac, Massachusetts on July 22, 2026, producing 1-inch stones during mid-day and prompting an NWS warning. The storm produced spotter-verified surface reports and radar echoes along a narrow corridor that included parts of Plaistow.

What Happened

A convective cell organized over northeastern Massachusetts late morning and moved over Merrimac around mid-day. The National Weather Service issued a warning at 12:44 PM EDT (16:44 UTC) that listed 1-inch hail and described the alert area as a warning area only. Dual-polarization radar showed a concentrated hail signature tracking roughly northeast through the town during the next 20 to 30 minutes.

Local ground observations aligned with the radar timeline. A weather spotter reported hail at 12:50 PM EDT (16:50 UTC). Social media photos from Plaistow were time-estimated by radar to 1:05 PM EDT (17:05 UTC), and were noted in local storm reports as spotter-verified imagery. The sequence of warning issuance, radar-detected hail echoes, and these spotter reports indicates a focused but short-lived hail-producing segment within the larger convective line.

Damage Assessment

Field reports for this event consist of a spotter observation and time-stamped social media photos; there were no Local Storm Reports documenting structural failure or insured-loss claims in the immediate aftermath. Radar-derived hail echoes were colocated with the spotter observations near the Merrimac–Plaistow corridor, suggesting surface impacts were confined and patchy rather than widespread across the entire NWS warning area.

Inspections and insurance feeds detected no immediate surge of vehicle or roofing damage reports tied to this event. No spotter or NWS follow-up indicated broken tree limbs, roof punctures, or solar-panel damage in Merrimac during the afternoon canvass period. The photographic evidence reported from Plaistow shows hail accumulation on paved surfaces in photos but does not include documented property damage in the official storm reports.

What Contractors Should Know

Prioritize an initial visual canvass along routes between Merrimac center and the Plaistow photoshoot locations. Focus first on exposed assets: rooftop-mounted HVAC units, south- and west-facing roofing slopes, and vehicles parked outdoors during mid-day. Look for denting, pitting, and granule loss on asphalt shingles. Document all findings with photos that include a timestamp and a common scale object for size reference.

Inspect gutters, siding, and soft metals for cosmetic impacts that can lead to leaks later. For roofing systems with older or thin-cover shingles, check nail heads and flashing details where small hail can accelerate wear. If solar arrays are present on properties within the radar-aligned corridor, prioritize micro-crack checks on cell surfaces and junction boxes; photographic comparison to pre-storm imagery will speed triage.