Tornadoes are extremely rapid rotating winds that form at the base of cumulonimbus clouds. Smaller tornadoes may even form inside larger ones. Luckily, most tornadoes remains on the ground for just a few minutes. During that time, however, they can cause considerable- and sometimes strange- damage, such as driving a fork into a tree. Tornadoes often form from a type of cumulonimbus cloud called a wall cloud. Strong, spiraling updrafts of warm, moist air may form in these clouds. As air spins upward, a low-pressure area forms, and the cloud descends to the ground in a funnel. The tornado sucks up debris as it moves along the ground, forming a dust envelope. (McGraw Hill, pg.49) Two types of air affect weather patterns in the Tornado Alley region. Warm, moist air blows north from the Gulf of Mexico. Cold air blows south from Canada. Thunderstorms and tornadoes are more likely to form when these two air masses meet. Tornadoes can occur any time the weather conditions are right, but most tornadoes form in April, May, or June. (Allen, pg.17) In other words, tornadoes happen when warm, wet air moving in one direction meets colder, drier air coming from the opposite direction. When two different air masses meet, warm air rises over the cold air it starts to spin. (Spilsbury, pg.6) This is how a tornado
Tornadoes are extremely rapid rotating winds that form at the base of cumulonimbus clouds. Smaller tornadoes may even form inside larger ones. Luckily, most tornadoes remains on the ground for just a few minutes. During that time, however, they can cause considerable- and sometimes strange- damage, such as driving a fork into a tree. Tornadoes often form from a type of cumulonimbus cloud called a wall cloud. Strong, spiraling updrafts of warm, moist air may form in these clouds. As air spins upward, a low-pressure area forms, and the cloud descends to the ground in a funnel. The tornado sucks up debris as it moves along the ground, forming a dust envelope. (McGraw Hill, pg.49) Two types of air affect weather patterns in the Tornado Alley region. Warm, moist air blows north from the Gulf of Mexico. Cold air blows south from Canada. Thunderstorms and tornadoes are more likely to form when these two air masses meet. Tornadoes can occur any time the weather conditions are right, but most tornadoes form in April, May, or June. (Allen, pg.17) In other words, tornadoes happen when warm, wet air moving in one direction meets colder, drier air coming from the opposite direction. When two different air masses meet, warm air rises over the cold air it starts to spin. (Spilsbury, pg.6) This is how a tornado