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Air MassesHow do you think these air masses effect our weather?
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AIR MASSES
AIR MASS - a huge body of air that has similar temperature, humidity, and air pressure throughout.
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Air Masses
Tropical air mass - warm, low pressure air mass.
Polar air mass - cold, high pressure air mass.
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Air Masses
Maritime air masses form over oceans. The air is humid.
Continental air masses form over land. The air is dry.
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Air Masses
Now put the two words together!
Tropical
PolarContinentalMaritime
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Air Masses
TropicalMaritime
In summer it brings hot, humid weather. In winter it can bring heavy rain or snow.
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Air Masses
Maritime
It brings fog, rain, & cool temperatures.
Polar
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Air Masses
It brings hot, dry weather.
Continental Tropical
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Air Masses
It brings cool or cold air.
Continental Polar
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Air MassesLabel your map!
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Weather FrontsAir masses are moved from one area to another by wind.
Front - the area where the two air masses meet.
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http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.cfm?chapter_no=visualization
Cold Front - when a cold air mass is moving rapidly pushes a warm air mass out of the way. The warm air rises, thunderstorms occur. After the front passes, cool & dry air moves in.
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COLD FRONT
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Warm Front - A fast moving warm air mass collides with a cold air mass. The less dense warm air rises.
If the air is humid, it rains. If the air is dry, scattered clouds form.
http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.cfm?chapter_no=visualization
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WARM FRONT
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Other Fronts
Stationary Front - When air masses meet, but neither one can move the other. Rain, snow, fog, or clouds can form. It could rain for many days.
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STATIONARY FRONT
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Occluded Front - a warm air mass is caught between two cooler air masses.
The warm air rises and the 2 cooler air masses meet.
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Occluded Front
The air becomes cooler on the ground. The rising warm air condenses, & the weather may turn rainy.
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OCCLUDED FRONT
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High and Low Pressure
High Pressure - signal of fair weather. The wind spins in a clockwise direction.
Low Pressure - signal of rainy weather. The winds spin in a counterclockwise direction.
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Predicting the Weather
Instrumentsanemometer - wind vane - thermometer- psychrometer-barometer-rain gauge-
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How do you predict the weather?
·weather station·satellite images·radar images
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Before we are ready to predict the weather, we have to learn a couple things!
·weather map symbols·calculating relative humidity
http://library.thinkquest.org/5818/maps.html