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4th grade Unit 4 Weather
4th grade Unit 4 Weather
Terms in this set (34)
The state of our atmosphere at any given time.
The pattern or cycle of weather conditions (temperature, wind, rain, snowfall, humidity and clouds), over large areas that are averaged over many years
The layer of gas that surrounds the earth.
A person who studies weather conditions
A prediction of weather conditions for future days
Pressure created by the weight of the atmosphere
The cycle of water moving through the atmosphere
A puffy white cloud caused by rising warm air; signals fair weather
A type of high level cloud that is thin and wispy, like curls of hair; found in fair weather
Gray sheet-like layer of clouds across the sky that usually mean longer lasting drizzling rain or snow
fast rising clouds with a spreading top that usually mean severe thunderstorms and strong winds
the amount of water vapor in the air
forms when a cold air mass meets a warm air mass
Things in the atmosphere that can affect weather:
temperature in the air, wind speed, air pressure, humidity, clouds, precipitation
The sun's rays (both direct and indirect) heat
the surface of the Earth and the air in the atmosphere.
Air takes up space and
The particles of air pressing down on the surface causes
Air pressures changes as you go
higher in the atmosphere.
Air particles in upper atmosphere are
farther apart creasting less air pressure.
Air particles in lower atmosphre are
closer together creating more air pressure.
Winds are belts of moving air that flow
from one area to another driven by energy from the sun.
High in the air, water vapor
condenses to form clouds
Air masses are
huge bodies of air that can cover thouds of kilometers. They have the same general properties as the land or water over which they form.
A front is formed when
two air masses meet and form a border. They do not mix. This iw where weather changes happen.
a tool used to measure air pressure
a tool used to measure humidity
a tool used to measure wind speed
a tool used to measure temperature
a tool used to measure wind direction
a tool used to collect and measure the amount of rain that falls
Weather maps are used by scientists to
record their measurements of weather conditions.
Precipitation is any form of water that
falls from the sky.
is the most common form of precipitation.
Weather maps provide information about the weather
in a particular area.
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