Earth & Space Chapter 9 Definitions
Terms in this set (42)
localized storms involving lightening, thunder, strong winds, heavy rain, and sometimes hail or tornadoes.
Currents of rising air that are stopped by adiabatic cooling and thus do not rise to great altitudes.
Air that is warm near the ground but very cold at higher altitudes.
Mature Stage of a Storm
The thunderstorm reaches the peak of it's strength droping precipitation due to the weight of the ice crystals and water droplet size.
Concentrated blasts of cool wind that can blow downward at 130 miles per hour or more.
Storm containing one cell, or updraft system.
Long line of advancing thunderstorms, usually moving ahead of a cold front.
Most powerful type of thunderstorm containing a fierce single-updraft.
A narrow funnel of powerful, rapidly whirling wind that stretches from a cloud to the ground.
A low-pressure system in which winds rotate in the direction that would be caused by the Coriolis effect.
This begins when differences in wind direction and speed at different altitudes cause a horizontal "cylinder" of air to rotate.
A large rotating cylindrical extension from the base of the supercell.
He devised a scale to class tornadoes based on intensity and area.
A tornado that forms over water.
Intense low-pressure systems that develop in the tropics. A term used in North America and the Caribbean.
Intense low-pressure system that devolves in the tropics. A term used in the Western Pacific and Indian oceans.
A tropical cyclone with sustained wind speed less than 39 miles an hour.
Tropical depression in which wind speeds have reached 39 miles per hour.
Tropical depression in which winds have reached speeds of 74 miles per hour.
Center of a hurricane.
The most destructive force of a hurricane.
Falling Atmospheric Pressure
Indicates bad weather.
Rising Atmospheric Pressure
Indicates good weather.
Atmospheric pressure is measured with this instrument.
An important tool used by meteorologist in which radio waves are used to detect objects and measure their distance.
A mesocyclone's development is revealed by this in radar images of a severe thunderstorm.
What are the three stages of a thunderstorm?
Cumulus, mature, dissipating
An updraft of air collecting moisture that condenses forming a cumulus cloud. This stage usually lasts for 10-15 minutes
When the updraft of the thunderstorm disappears, cutting off the storms power supply. The clouds begin to evaporate because they no longer have the constant flow of moisture.
an abrupt discharge of electricity through the air that produces a quick flash of bright light.
How does lightning form?
1. Static electricity forms in the cloud and collects at the base of it, creating a strong negativly charged region.
2. AS the cloud moves over an area, a positive charge developes on the ground.
3. Eventually the attraction between the charges overcomes the ability of the wind to keep them a part.
electron stream caused by the negativly charged particles in the clouds connecting with the postivily charged region on the ground.
a huge current of positive charge that surges upward from the ground to the cloud; the upward flow of positive charge forms the brillian flash of light that can be seen
a huge electrical charge that appears after the first strike
a shockwave of sound caused by the heat from the return stroke of lighting causing the air near the lightning to expand explosively
What are the 6 types of lightning?
1. negative cloud-to- ground
2. positive cloud-to- ground
3. hot lightning
6. ball lightning
a rotating column of air that starts on the ground and is not associated with a cloud.
What two "ingredients" are required for a hurricane?
A warm ocean and a region where the Coriolis effect is very pronounced
Stages of a hurricane
Tropical disturbance, tropical cyclone, tropical depression, tropical storm, hurricane
What is one of the most destructive forces of a hurricane?
What are some named hurricanes listed in the book?
Hugo 1989, Andrew 1992, Dennis, Katrina, Rita, Stan and Wilma in 2005
A hurricane danger where elevated water levels caused by the hurricane's winds pushing water ahead of the storm
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