A scale that tells how severe a tornado is based on wind speed and the damage being caused.

Classifies hurricanes according to wind speed, air pressure in the center, and potential for property damage.

location of greatest air pressure

The lowest layer of the atmosphere where weather occurs

2nd layer of atmosphere; extends from 10 to 30 miles up; location of ozone layer; absorbs 95% of Ultraviolet radiation; temperature increases with altitude increase.

3rd layer of the atmosphere and protects us from meteors

The uppermost layer of the atmosphere, in which temperature increases as altitude increases

the lower part of the thermosphere, where electrically charged particles called ions are found and contains auroras

a localized and violently destructive windstorm occurring over land characterized by a funnel-shaped cloud extending toward the ground

A severe storm that develops over tropical oceans and whose strong winds of more than 120 km/h spiral in toward the intensely low-pressure storm center

A heavy snowstorm with strong winds

a long period without rain

A very heavy flow of water, which is greater than the normal flow of water and goes over the stream's normal channel.

Line drawn on a weather map that connects points having equal temperature

Wispy, feathery clouds made of ice crystals that form at high levels.

clouds that look like fluffy, rounded piles of cotton

look like flat blankets and are usually the lowest clouds in the sky

Thunderstorm clouds

an announcement that a tornado has been seen in the sky or on weather radar

This is an alert issued when weather conditions are right for a tornado.