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Ch 13

Nature of storms

TermDefinition
Air-mass Thunderstorms type of thunderstorm in which air rises because of unequal heating of Earth's surface within a single air mass and is most common during the afternoon and evening.
Cold Wave extended period of below-average temperatures caused by large, high-pressure systems of continental polar or arctic origin
Downbursts a localized area of strong winds in a downdraft beneath a severe thunderstorm
Drought a long period of dry weather
Eye Center of a hurricane where air is calm.
Eyewall They are a tall band of strong winds and dense clouds that surround the eye and is usually the part of the cyclone with the strongest wind.
Frontal Thunderstorms a thunderstorm that is produced by advancing cold fronts and , more rarely, warm fronts
Fujita Tornado Intensity Scale scale used to rate a tornado's intensity
Heat Wave A prolonged period of extensively hot weather.
Hurricane A severe storm that develops over tropical oceans and whose strong winds of more than 129 km/h spiral in toward the intensely low-pressure storm center.
Lightning A sudden spark, or energy discharge, caused when electrical charges jump between parts of a cloud, between nearby clouds, or between a cloud and the ground
Saffir-Simpson Hurricane Scale Classifies hurricanes according to wind speed, air pressure in the center, and potential for property damage
Sea-breeze Thunderstorms local air-mass thunderstorms that occur because land and water store and release thermal energy differently
Storm Surge A dome of water that sweeps across the coast where a hurricane lands
Supercell Extremely powerful, self-sustaining thunderstorm characterized by intense, rotating updrafts
Tornado A mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system
Tropical Cyclone A severe storm with high winds that spiral around a calm center
Wind-Chill Factor A measure of cooling combining temperature and wind speed.
Created by: mccormickj
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