Hail, Wind & Tornado Reports in Lewis and Clark County, MT

Usually too small to cause hail damage to most sound asphalt roofs, siding, or gutters.

Below the NWS severe-hail threshold, but not always harmless. Repeated small hail can scuff surfaces, wear aging shingles, and loosen protective granules over time.

Below the NWS severe-hail threshold, but roof hail damage is still possible on older, brittle, poorly installed, or previously damaged shingles. May also mark screens, vents, gutters, and soft metal.

Still below the severe-hail threshold, but large enough to leave visible marks on soft metal and add wear to older or hail-weakened roof shingles.

The NWS severe-hail threshold. Quarter-size hail can bruise shingles, dent soft metal, and create roof hail damage worth checking.

More likely to dent gutters, vents, flashing, and siding. Hail damage risk rises quickly on older roofs or hail-weakened shingles.

Hail damage becomes more likely, including bruised shingles, granule loss, dented siding, and damaged roof vents.

Often causes roof hail damage, cracked shingles, dented gutters, damaged flashing, and siding impacts. A roof inspection is recommended.

Can crack or puncture shingles, expose mat, dent siding, and cause widespread hail damage across the roof and exterior.

Can cause heavy roof hail damage, punctured siding, broken skylights, damaged vents, and widespread exterior damage.

Major hail damage is likely, including severe roof impacts, damaged siding, broken windows, and possible major roof repairs.

Can cause heavy hail damage across the roof, siding, gutters, windows, and exterior. Significant repairs are often needed.

Destructive hail damage. Can severely damage roofing materials, siding, windows, gutters, vents, vehicles, and exterior surfaces.

Catastrophic hail damage risk for roofs, windows, vehicles, siding, gutters, and exterior surfaces.

Usually little damage to a sound roof, but loose shingles, flashing, or debris may shift.

Can loosen shingles, lift flashing, break limbs, and damage gutters, siding, fences, or trim.

Can peel shingles, damage vents, tear siding, rip gutters, and expose weak roof areas.

Can cause major roof covering loss, tree damage, broken windows, and structural damage.

Can peel shingles, damage gutters or siding, break tree limbs, and toss loose outdoor items.

Can strip roof covering, damage exterior doors, break windows, snap trees, and cause heavier siding or gutter damage.

Can tear off large sections of roofing, break or uproot trees, destroy weaker structures, and cause major exterior damage.

Can remove roofs and walls, destroy large portions of homes, toss vehicles, and cause severe to total destruction near the path.