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Storms Overview

Storms Overview. Background Basics. Air around the planet constantly moves in response to the rotation of the planet. Cold air is more dense than hot air and thus when these two types of air masses collide the hot air rises. (cold air is generally dryer)

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Storms Overview

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  1. Storms Overview

  2. Background Basics • Air around the planet constantly moves in response to the rotation of the planet. • Cold air is more dense than hot air and thus when these two types of air masses collide the hot air rises. (cold air is generally dryer) • When the warm air is forced upwards it creates a lower pressure region. • Cold air moves in to fill the region left behind by the warm air and thus the cycle continues. • Low pressure area moves with the Earth’s atmosphere which rotates west to east. • In the northern hemisphere, wind rotates in a counter-clockwise manner around a storm center. (powered by the Coriolis effect)

  3. Background Basics • A storm ends when either the warm or the cold air dissipates and things return to normal (equilibrium is re-established). • The meeting of cold polar air and warm equatorial air causes the areas of different pressure.

  4. Background Basics THUS… A STORM FORMS IN RESPONSE TO DIFFERENCES IN AIR PRESSURE DRIVEN BY THE MOVEMENT OF COLD AND WARM AIR!

  5. equilibrium • The atmosphere likes equilibrium and dislikes pressure differences. • The greater the pressure difference, the stronger the wind.

  6. Indicators of a Storm: • Strong wind • Thunder • Lightning • Heavy precipitation • Cumulonimbus clouds

  7. Types of storms • Ice Storm • Blizzard • Snowstorm • Ocean Storm (strong winds, often associated with capsized vessels) • Firestorm (strong winds, often associated with forest fires) • Tornado • Hailstorm • Tropical Cyclone • Thunderstorm • Squall • Dust Devil • Windstorm

  8. How do you classify a weather event as a storm? • Meteorologically speaking: winds greater than a 10 on the Beaufort scale. • In common, everyday language a storm has a different meaning.

  9. Ice storm, blizzard and snowstorm

  10. Ocean storm and tropical cyclone

  11. firestorm

  12. tornado

  13. hailstorm

  14. Windstorm and squall

  15. Dust devil

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