Downburst in a Jar

Bring storm science to life with this magical color-drop experiment that shows how powerful downward wind rushes straight down and spreads out, just like a real storm’s force.

  • Category: ** Free **

You’ll Need:

  • A clear jar filled with water
  • Shaving foam (to make the “cloud”)
  • Liquid food coloring (blue works beautifully)
  • Bowl to mix the food coloring
  • Dropper or syringe to spray the color in

Let’s Make it:

  1. Fill your jar with water and add a thick, fluffy layer of shaving foam on top to make your cloud.
  2. Use a dropper or syringe to spray the food coloring onto the cloud.
  3. Watch closely as the color suddenly shoots straight downward, creating a strong vertical column and swirling movement beneath the cloud.

What Is Happening Here…

  • A down-blow wind begins inside a big storm cloud, high up in the sky where the air is very cold. When too much cold air builds up in one spot, it becomes heavier than the warm air around it and it suddenly drops very fast — sometimes up to 270 kilometres per hour!
  • After it hits the ground, the wind can’t go down anymore, so it spreads outward in all directions — and because the fast wind is rushing away so quickly, it makes the air around it slide inward, making a little swirl called a vortex ring.

Why We Love It:

  • Shows downward wind in a clear, child-friendly way—instead of just hearing about it.
  • Gives a gentle intro to real storm concepts, like downbursts and vortex rings, without anything scary or overwhelming.
  • Invites lots of open-ended questions, sparking curiosity: “Why did it go fast?”, “Where did it spread?”, “Why did it swirl?”
  • Uses simple materials, making it easy, fun and budget-friendly for at-home science play.

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