1. Weather

2. Air Masses
A large body of air that has properties similar to the part of the Earth’s surface over which it develops.

4. Air Mass Map Continental Polar (cP) or Arctic forms over Canada.
Maritime polar (mP)-forms over North Atlantic Ocean is cool and very wet brings rain and snow to the Pacific coast in the winter and cool, foggy weather in the summer. mP’s bring cool, cloudy weather to New England in winter, and cool weather and fog during summer.
mT-develops over warm areas in the Pacific Ocean and Gulf of Mexico and Atlantic
cT-forms over deserts of northern Mexico and south western US—brings clear dry.

5. Fronts
A boundary between two air masses of different density, moisture, or temperature.

6. Cold Front

8. Warm Front

10. Occluded Front

12. Stationary Front

14. NWS Two sources of forecasting weather
Data collected from upper atmosphere
Data collected on the Earth’s surface

15. Weather Station Model

16. Isobars Isobars-connect points of the “same”
Examples: temperature and wind speed
The further away the lines the lower the wind speed

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