Tools  /  Volcanic Ashfall Simulator   Free

The lava stays home. The ash travels.

You don't have to live near a volcano to be buried by one. Ash rides the wind for hundreds — even thousands — of miles, collapsing roofs, grounding planes, choking engines and ruining crops far downwind. Pick a real volcano (or place your own) and watch the ash spread.

Controls
Pick a volcano above, or click the map to place your own.
Scale
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Prevailing winds aloft shift through the year — winter is strong & westerly, summer is lighter & more southerly. Pick Manual… to set the wind by hand.
Stronger wind carries ash farther downwind but spreads it thinner.
Click near any volcano to erupt it →

Ash isn't snow. Don't wait it out casually.

N95 masks, sealed water, clean-air rooms and a plan to clear roof loads — ashfall preps are cheap and rarely on anyone's list.