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TRANSCRIPT
Weather and Climate
By: Tyler Laurain
7th grade science standards
E.ES.07.72- Describe how different weather occurs due to the constant motion from the atmosphere.
E.ES.07.74- Describe weather conditions associated with frontal boundaries and movement of major air masses and the jet stream across North America using a weather map.
WeatherCondition of the air on earth
The sun determines our weather
Water evaporates into the air
Causes our air to rise
Fronts and Air Masses
Air MassesLarge body of air
Have similar properties
Can be tracked over time
Gives us clues to future weather
Air MassesDifferent air masses don’t usually mix
Boundary, or front, forms between masses
Stormy weather often occurs along fronts
Cold FrontsCold air moves into warm air
The cold air becomes more dense
Pushed under warm air
Cumulus clouds and showers occur
Winds change directions, temperature drops
Cold Fronts
Warm FrontsWarm air moves into cold air
Pushed above cold air
Cirrus and possibly stratus clouds form
Some participation, rain or snow
Air pressure and temperature rise
Warm Front
Stationary FrontSometimes air masses don’t
move
Variety of weather occurs
Usually clouds with light precipitation
Dissipate after several days
Stationary Fronts
QuestionsWhat is an air mass?
What happens in a cold front?
High Pressure Area’sShown by “H” symbols
Pressure is greater then surrounding areas
Air pressure difference results in wind
Low Pressure Area’sShown by “L” symbols
Winds blow into low pressure zones
Incoming winds cause clouds and precipitation
Using a Weather MapRed arrows are warm fronts
Blue arrows are cold fronts
“H” high pressure zones
“L” low pressure zones
Weather Map
Predicting WeatherMeteorologists monitor weather
conditions
Sample wide network of weather stations
Satellite images
Predicting WeatherPredict with great deal of
accuracy
Weather moves from west to east
Geographic conditions can affect local weather
CreditsAxel Rouvin, CG lightning strike,
January 18th 2007, Attribution
NOAA, Weather Map, December 14th 2003, Public Domain
Lisa Gardiner, Windows To The Universe, September 30th 2010, Attribution Share-Alike
CreditsWikimedia, Weather Map
Symbols, September 30th 2010, Attribution Share-Alike