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Investigating Hail & hailstorms

Investigating Hail & hailstorms. For elementary school By Kathy Applebee. Remember the water cycle? The sun’s heat powers the water cycle. Ground water molecules heat up, move faster and faster until some of us evaporate into the air.

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Investigating Hail & hailstorms

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  1. InvestigatingHail & hailstorms For elementary school By Kathy Applebee

  2. Remember the water cycle? The sun’s heat powers the water cycle. Ground water molecules heat up, move faster and faster until some of us evaporate into the air. As we travel up, we cool down until we condense (get closer together) usually forming clouds.

  3. The water drops fall towards earth. But if the storm is powerful enough, the updraft sends us water vapor droplets back up. Then we turn into hail. What is an updraft? Time to go inside!

  4. Aggregate hail • If the droplet has already frozen into hail, it adds another layer if ice. This keeps happening until it is heavy enough to fall back to the Earth. Aggregate is the scientific word for this. Can you see the smaller pieces that make up this 6 cm hailstone?

  5. Hail Updraft demo (2) The pressure of the updraft of air moves the ping pong in the stream of air. The further the ball is from the source of power (hair dryer/updraft) the less effect the power source has on the ball. Eventually the ball/hail is far enough away that it drops back to earth. Repeat using a golf ball. ASK: Why can’t the hair dryer keep the golf ball up? Once a student says because it is too heavy ASK: What would we have to do to get a golf ball to stay up? Once a student suggested a more powerful source of moving air EXPLAIN: When the wind/updraft is strong enough, the hail goes back up, has more water/ice/mass attach to it. EXPLAIN: Updrafts are responsible for the thunderstorms we experience. Generally the stronger the updraft, the heavier the piece of hail that can be supported and thus the more times the hail is thrown upward and gathers more mass.

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