The condition of the atmosphere at a particular time and place.
The continuous movement of water from water sources into the air, onto land, into and over the ground, and back to the water sources; a cycle that that links all of the Earth's solid, liquid, and gaseous water together.
The amount of water vapor or moisture in the air.
The amount of moisture the air contains compared with the maximum amount it can hold at a particular temperature.
The change of state from a gas to a liquid.
The temperature to which air must be cool to be completedly saturated.
A collection of millions of tiny water droplets or ice crystals.
Solid or liquid water that falls from the air to the Earth.
A large body of air that has similar temperature and moisture throughout.
The boundary that forms between two different air masses.
A small, intense weather system that produces strong winds, heavy rain, lightning, and thunder.
The large electrical discharge that occurs between two oppositely charged surfaces.
The sound that results from the rapid expansion of air along a lightning strike.
A small, rotating column of air that has high wind speeds and low central pressure and that touches the ground.
A large, rotating tropical weather system with wind speeds of at least 119km/h.
A tool used to measure air temperature.
An instrument used to measure air pressure.
A device used to measure wind direction.
A device used to measure wind speed.
Lines that connect points of equal air pressure.
A device used to measure wind direction.