Weather and Climate Lecture 13: Severe Weather and Hurricanes Thunderstorms A thunderstorm is simply a storm containing lightning and thunder. Thunderstorms occur all over the world Formation - Ingredients Moisture (water vapor) in the lowest levels of the atmosphere
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Severe Weather and Hurricanes
Multicell Line (Squall Line)
What does it look like from a downburst vs. a derecho?
As the tornado moves along a path, the circular tornado winds blowing opposite the path of movement will have less speed.
For example, if the storm rotational speed is 100 knots, and its path is 50 knots, it will have a maximum wind of 150 knots on its forward rotation side.
View from East
The first sign that a supercell may form a tornado is the sight of rotating clouds at the base of the storm, which may lower and form a wall cloud, shown in this picture.
Pictures @ Luis Rico Rojo