Definition
A long-lived, fast-moving line of severe thunderstorms producing hurricane-force straight-line winds over hundreds of miles — the Mid-Atlantic's signature extreme wind event. The June 2012 derecho crossed WV, VA, and MD with 70–90 mph winds and left millions without power. For garage doors it matters twice: wide unreinforced doors can flex out of their tracks under that wind load (struts and wind-rated hardware are the fix), and the outages that follow are why battery-backup openers earn their keep here.
Why this term matters for homeowners
Safety terms center on UL 325 entrapment protection — photo eyes, auto-reverse, force settings — plus the monthly tests that prove the heaviest moving object in your home is behaving.
- Use this term to ask better follow-up questions during estimates.
- Look for this language in Learn and Evaluate guides to connect definition to decisions.
- Confirm how this applies to your specific door size, age, and daily use.
Related pages
Category: Garage Door Safety