atmospheric movement and weather maps
TRANSCRIPT
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*When convection and winds cause air
masses to move, they bump into one
another.
*The area where two air masses meet is
called a front.
*Most severe weather occurs near frontal
boundaries.
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*Cold, dense air is moving toward warm, less dense air.
*The warm air is pushed up to cool and form clouds as the
cooler air replaces it.
*The air on the front side of the boundary line is warmer
than the air on the back side of the boundary line.
*These fronts are usually fast moving and bring stormy
weather and heavy precipitation followed by clearing
skies and higher pressure.
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*Warm air is moving toward cold air.
*The warm, less dense air slides over the cold, more dense air.
*The air on the front side of the boundary line is cooler than the air on the back side of the boundary line.
*These fronts usually move slowly and bring steady rain or snow over many days.
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*Warm and cool air masses that are not strong
enough to move one another
*Sits still for a long period of time
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*These fronts occur when neither the
cool nor warm air masses are strong
enough to replace each other.
*They tend to stay in an area for a long
period of time, often bringing long
periods of precipitation and clouds.
*
*Two cooler air masses meet and force a warm
air mass aloft.
*Brings cool temperatures and large amounts of
rain or snow.
*Followed by clear skies and drier air.
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*This is when a warm air mass is caught between two cold air masses.
*The colder air mass moves under the warm air mass and pushes it up.
*The colder air mass then moves forward until it meets a cold air mass that is warmer and less dense.
*The colder air mass moves under this air mass and pushes it up.
*Brings clear skies and drier air.
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*The heating and cooling of water and land
produces land breezes and sea breezes.
*High pressure moves toward low
pressure, pushing the warm air upward.
*As warm air rises, cooler air moves in and
replaces it.
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*The Sun heats the water and land every day.
*Land heats up rapidly, but cools off rapidly.
*Desert
*Water heats up slowly, but cools off slowly.
*Swimming at night
*The heat retained by the oceans is what keeps our
planet insulated.
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*Weather is the atmospheric condition at a certain time and place.
*Weather maps are used to show current weather conditions in an effort to predict future weather conditions.
*You need to know what each symbol means and how to interpret them to forecast the weather.
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*Air pressure is measured with a barometer in
millibars.
*Millibars are represented by connected lines of equal
pressure. This is a lot like the topographic map lines.
*The closer together the lines are, the faster the wind
speed.
*The farther apart the lines are, the slower the wind
speed.
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*Cooler, dense air close to the surface of
the Earth.
*Surrounded by winds flowing in a
clockwise direction.
*Usually brings dry conditions and fair
skies.
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*Warmer, less dense air above the Earth’s
surface
*Surrounded by winds moving in a
counterclockwise direction.
*Associated with the formation of storms.
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