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How Does Wind Speed Determine Storm Damage Severity?

Last updated October 26, 2026

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The short answer

Wind Speed Ranges and Damage

Wind speed is the main force behind storm damage. At 40 to 55 mph, loose objects can hit siding and windows, and rain can seep under older flashing. At 60 to 75 mph, shingles may lift or tear, and porch screens often fail. Once winds exceed 75 mph, structural damage becomes more likely, including broken windows and partial roof loss.

  • 40 to 55 mph: loose items, minor shingle lift
  • 55 to 70 mph: shingle damage, gutter separation
  • 70 to 85 mph: roof membrane tears, window breakage
  • 85 mph and up: structural framing stress, major water entry
  • Wind direction matters as much as speed
  • Rain volume combined with wind increases intrusion

How Wind Turns into Water Damage

Wind alone rarely causes the worst problems; it is the water that follows. When wind lifts a shingle or cracks a window, rain has a direct path into your attic or walls. The faster the wind, the harder the rain is driven sideways, so it can push up under eaves and into small gaps that a calm rain would never reach.

  • Check attic and crawlspace after high winds
  • Look for wet spots near windows and doors
  • Feel walls for dampness or soft spots
  • Move furniture away from leaking areas
  • Take photos of visible water entry points
  • Dry wet items within a day if possible

What Wind Speed Means for Your Roof

Your roof takes the first hit from high winds. Asphalt shingles start to lift at around 50 to 60 mph, and once the adhesive seal breaks, wind can peel them back. Missing or loose shingles expose the underlayment, which is not meant to stay wet. That is where rain finds its way into the decking and then into your ceiling.

The age and condition of your roof change the threshold. A newer roof with proper fasteners may hold up at higher speeds, while an older one with curled edges fails sooner. After a storm, check for granules in gutters or shingles on the ground. Those signs mean the roof has taken enough wind to need a closer look.

  • Loose or curled shingles are weak points
  • Granules in gutters signal surface wear
  • Check ridge caps for lifted edges
  • Look for daylight in attic along rafters
  • After a big storm, inspect from the ground first
  • Use binoculars to avoid climbing a wet roof

How to Assess Damage After the Storm

Start with a safe walk around your property once the wind dies down. Look for fallen branches, dented gutters, or siding that has shifted. Check the roof from the ground for missing shingles or visible gaps. Do not climb on a wet or damaged roof, because hidden structural issues can make it unsafe.

Inside, check ceilings and walls for new stains or drips. Feel baseboards and carpet edges for dampness. If you see water coming in, move valuables away and place a bucket under the leak. Document everything with photos and notes, because that record helps the pros understand where the wind caused the most pressure.

  • Walk the perimeter looking for debris impact
  • Check attic for wet insulation or rafters
  • Inspect window seals and door thresholds
  • Note any unusual roof sag or lifted edges
  • Record the time and date of each finding
  • Keep a list of items that got wet

When to Get Professional Help

If wind has pulled off shingles, cracked a window, or driven rain into walls, the pros can help. They use moisture meters and thermal cameras to find hidden water that you cannot see. That kind of inspection is useful after a severe storm, because water can travel along framing for feet before it shows up.

The pros also handle the cleanup and drying process, which reduces the chance of mold. They can remove wet drywall, dry out cavities, and treat surfaces. If you live in Bellingham, keep your insurance policy handy and check what your coverage includes. Acting quickly after a storm is the right way to limit damage.

  • Call the pros if water is actively leaking
  • Ask about moisture detection in walls
  • Get help if you smell a musty odor
  • Have the roof checked after winds over 60 mph
  • Save all receipts for temporary repairs
  • Policies vary, and your insurer decides what is covered.

Water damage does not wait

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Frequently asked questions

How fast does wind have to be to damage a roof?

Roof damage often starts around 50 to 60 mph, especially on older or poorly fastened shingles. At 70 mph and above, you may see torn flashing or exposed underlayment. The exact speed depends on your roof's age, material, and installation quality, so a visual check after any strong storm is wise.

What should I do right after a wind storm?

Stay indoors until the wind stops, then walk around your property looking for loose shingles, broken windows, or fallen branches. Check inside for water stains or damp spots. Take photos of anything damaged, and dry wet areas quickly. If you see active leaks, move furniture and place buckets under the drips.

Can wind damage cause mold even if I don't see water?

Yes. Wind-driven rain can sneak into small gaps in your roof or siding, and that moisture may stay hidden inside walls or attic insulation. Over days, damp materials can grow mold. If you notice a musty smell or new stains after a storm, a professional moisture inspection can find the source.

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