2. 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.
3. Weather Condition of the air on earth The sun determines our weather Water evaporates into the air Causes our air to rise Fronts and Air Masses
4. Air Masses Large body of air Have similar properties Can be tracked over time Gives us clues to future weather
5. Air Masses Different air masses don’t usually mix Boundary, or front, forms between masses Stormy weather often occurs along fronts
6. Cold Fronts Cold 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
7. Warm Fronts Warm 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
8. Stationary Front Sometimes air masses don’t move Variety of weather occurs Usually clouds with light precipitation Dissipate after several days
