Understanding Weather By: Chastity Reynolds

Weather Weather is the condition of the atmosphere at a particular time and place. Water Cycle: Continuous movement of water from water sources from water sources into the air, onto and over land, into the ground, and back to water sources.

Humidity Humidity: is the amount of water vapor moisture in the air. Relative Humidity: is the amount of moisture the air contains compared with the maximum amount it can hold at a particular temperature

Process of Condensation Condensation: the process by which a gas, such as water vapor, becomes a liquid. Dew Point: the temperature to which air must coo to be completely saturated.

Clouds Cloud: a collection of millions of tiny water droplets or ice crystals. Cumulus Clouds- puffy, white clouds Stratus Clouds-form in layers Cirrus Cloud- thin, feathery, white clouds

Precipitation Precipitation: water, in solid or liquid form, that falls from the air to the Earth. ➢ Examples: Snow, Sleet, or hail ➢ You measure precipitation using a rain gauge. It measures the amount of rainfall

Air Mass Air Mass: large body of air that has similar temperature and moisture throughout. Cold Air Masses-Brings extremely cold weather to the U.S. Warm Air Masses-Brings hot and humid weather in the summer

Fronts Fronts: boundary that forms between two different air masses Cold Front-cold air mass meets with warm air mass. Cold air overrides the warm air. Moves fast producing thunderstorms. Warm Front-warm air mass meets with cold air mass. Warm air moves over cold air. It brings drizzly precipitation.

Severe Weather Thunderstorms: are small, intense weather systems that produce strong heavy winds, heavy rain, lightning, and thunder. ➢ Thunderstorms are produced when the air near the Earth's surface must is warm and the atmosphere is unstable.

Severe Weather Lightning: a large electrical discharge that occurs between two oppositely charged surfaces Thunder: sound that results from the rapid expansion of air along the lightning strike.

Severe Weather Tornado:small, rotating column of air that has high wind speeds and low central pressure and that touches the ground. Hurricane:large,rotating tropical weather system with wind speeds of at least 119 km/h.

Forecasting Weather A thermometer is a tool used to measure air temperature. A barometer is an instrument used to measure air pressure.

Forecasting Weather Wind direction can be measured using a windsock or wind vane. Wind speed is measured by a device called an anemometer

Forecasting Weather Isobars are lines that connect points of equal air pressure.

Summary Weather Water Cycle Humidity Relative Humidity Condensation Dew Point Cloud Precipitation Barometer Wind vane ● Isobars ● Air Mass ● Front ● Thunderstorm ● Lightning ● Thunder ● Tornado ● Hurricane ● Thermometer ● Windsock ● Anemometer

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