6th Grade Weather Study Guide
Terms in this set (21)
What are three factors that determine weather?
Air temperature, air pressure, and humidity
What is air temperature?
the measure of the energy of motion of molecules in the air
What is air temperature measured with?
thermometer(in Celsius or Fahrenheit)
What is air pressure?
Weight of atmosphere pressing down on Earth's surface.
Where is the greatest amount of air pressure?
on or near the surface of the earth
How is air pressure measured?
with a barometer in millibars or inches of mercury
What is humidity?
The amount of water vapor in the air
How is humidity measured?
psychrometer in percent
How are clouds formed?
1. Water evaporates as it is heated by the sun.
2. Warm air rises in convection currents.
3. Water vapor condenses into tiny liquid particles (condensation)
What are the four types of clouds?
What is a warm front?
boundary between a warm air mass that is replacing a cold air mass. It brings clouds or precipitation.
What is the warm front symbol?
What is a cold front?
the boundary between a cold air mass that is replacing a warm air mass. It brings cold weather, precipitation and clear skies after.
What is a cold front symbol?
What is high pressure?
cold air is more dense, so it is high pressure. Results in fair weather.
What is a high pressure symbol?
What is low pressure?
Less dense, warm air. It results in clouds and precipitation.
What are three types of severe storms?
What is a thunderstorm?
A storm with lightning and thunder produced by a cumulonimbus cloud. Brings gust winds, heavy rain and sometimes hail. Can be caused by a change in air pressure.
What is a hurricane?
A tropical storm which forms over warm, tropical water.
What is a tornado?
A violent, rotating column of air that forms at the bottom of a cloud that touches the ground. Can be caused by change in air pressure.
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