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Thunderstorm Formation. A thunderstorm forms when warm, humid air rises rapidly within a cumulonimbus cloud. Thunderstorms have warm temperatures, moisture, and rising air, which may be supplied by a low-pressure system.

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thunderstorm formation
Thunderstorm Formation
  • A thunderstorm forms when warm, humid air rises rapidly within a cumulonimbus cloud.
slide2
Thunderstorms have warm temperatures, moisture, and rising air, which may be supplied by a low-pressure system.

Thunderstorms have a three-stage life cycle: the cumulus stage, the mature stage, and the dissipation stage.

slide3

The cumulus stage is dominated by cloud formation and updrafts.

  • After the cumulus stage, downdrafts, which are air currents moving vertically toward the ground, begin to form.
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In the dissipation stage, updrafts stop, winds die down, lighting ceases, and precipitation weakens.

slide8
A tornadois a violent, whirling column of air in contact with the ground.
  • Tornadoes form when thunderstorm updrafts begin to rotate.
tornado formation
Tornado Formation

Tornadoes can form when warm, humid air rises rapidly in thick cumulonimbus clouds—the same type of clouds that bring thunderstorms.

- Storms

tornado alley
Tornado Alley

Tornadoes in the U.S. are most likely to occur in a region known as Tornado Alley.

- Storms

tornadoes1
Tornadoes
  • Occur most in May & June
  • Occur most between 3-8 pm

What conditions are needed????

structure of a hurricane
Structure of a Hurricane

In a hurricane, air moves rapidly around a low-pressure area called the eye.

- Storms

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Begins as a low-pressure area over warm water, or a tropical disturbance

Warm, humid air rises and begins to spiral

As air rises, more warm, moist air is drawn into the system, and the hurricane gains energy

As winds spiral inward, bands of high winds and heavy rains form.