Understanding Hail Formation

The video explains how hail forms and grows within thunderstorms. Hailstones are created when ice crystals and snow pellets collide in storm clouds filled with supercooled water droplets. Strong updrafts keep these pellets aloft, allowing them to gather more droplets and grow. Hailstones can develop layers of ice, resembling an onion, and vary in size from small peas to large softballs. The video also highlights the dangers of hail, including its potential to cause significant damage due to its size and speed. Finally, it previews the next episode, which will cover tornadoes.

What are some of the impacts of hail on the environment?

• It can cause droughts.

• It can improve air quality.

• It can increase temperatures.

• It can devastate crops and damage property.

What is necessary for the formation of hailstones in a thunderstorm?

• High humidity levels

• Strong sunlight

• Collisions of ice crystals and snow pellets

• Presence of dust particles

What role do supercooled water droplets play in hail formation?

• They evaporate quickly.

• They freeze onto ice crystals to form hailstones.

• They melt the hailstones.

• They prevent hail formation.

How do stronger updrafts affect hailstone formation?

• They reduce the size of hailstones.

• They cause hailstones to melt.

• They prevent hailstones from forming.

• They allow hailstones to grow larger by keeping them aloft longer.

What is the appearance of a hailstone when cut open?

• It is hollow inside.

• It has a single solid core.

• It resembles an onion with layers.

• It is filled with water.

What is the size range of hailstones?

• From the size of a coin to a basketball

• From the size of a grain of sand to a pebble

• From pea size to softball size and larger

• From the size of a marble to a tennis ball

What was notable about the largest recorded hailstone?

• It was found in a desert.

• It fell in South Dakota and measured over 20 centimeters across.

• It was the size of a golf ball.

• It was made entirely of slush.

Why is the speed of falling hailstones a concern?

• They can create loud noises.

• They can travel at high speeds, causing significant damage.

• They can change weather patterns.

• They can cause fires.

What is the terminal velocity of small hailstones?

• 10 kilometers per hour

• 30 kilometers per hour

• 70 kilometers per hour

• 50 kilometers per hour

What can happen when a large hailstone strikes the ground?

• It can evaporate instantly.

• It can cause a small earthquake.

• It can bounce back into the air.

• It can dent metal and shatter glass.