We just learned about the huge storm clouds called Roll Clouds.
Many people have jobs where they work to try and predict the weather and different types of storms.
A very important thing to measure is wind speed.
The tool used to measure wind speed is called the Anemometer.
The first anemometers that were invented were small cups on a stick that spun around, and counted how many times it spun around per minute.
Some later anemometers look more like an airplane with a propeller and a tail, and they can tell wind direction and speed.
(from: wikipedia - wind speed)
Kid Facts - Blast from the past: Mudstone
