Vocabulary Words Thunderstorm Vortex Funnel cloud Tornado Hurricane Typhoon Cyclone Eye Eye wall Radiation Greenhouse gases Greenhouse effect Conduction Convection Heat Temperature Air masses Stable Unstable Condensation Convection Thermals Wind Convection currents Definitions A disturbance in the earth’s atmosphere that involves lightning and thunder. The movement of a liquid or gas in a spiral around a central axis The process of a rapidly rotating cloud becoming visible as a funnel at the base of the thunder cloud A violent windstorm that spirals around a rotating column of air (the vortex) of intense low pressure and moves in a narrow path over the land A massive, rotating storm that originates over tropical oceans and has sustained winds of more than 119 km per hour A storm that develops north of the equator in the Western Pacific Ocean A storm that develops in the Indian Ocean or off the coast of Australia The center of a hurricane A ring of spiraling clouds and thunderstorms that whirl around the storm’s center and extend upward to almost 15 km above sea level The direct transfer of hear energy by electromagnetic waves Water vapor and carbon dioxide Radiated energy reaches the clouds in the atmosphere then is re-radiated back to the earth The process by which heat energy transfers from one material to another through direct contact Heat energy transfers as a result of the circulating motion of a fluid, usually a gas or a liquid A form of energy that transfers because of a temperature difference An indication of the amount of heat energy in matter Bodies of air with nearly uniform conditions of temperature and humidity An air mass whose temperature does not decrease with altitude An air mass whose temperature decreases rapidly with an increase in altitude A process which releases tremendous amounts of heat into the atmosphere The movement of heat through air Rising pockets of air The moving part of a convection current The vertical movement of warm air upward and cool air downward due to the uneven heating of the earth’s surfaces