1. Mr. Fetch’s Earth Science Classroom Fronts COLD FRONTS WARM FRONTS STATIONARY FRONTS A boundary between two air masses:

2. Mr. Fetch’s Earth Science Classroom When air masses meet… mT Maritime Tropical Moist, warm air to south east coast of the US. mP Maritime Polar Moist, cold air to west coast of the US.

3. Mr. Fetch’s Earth Science Classroom Cold Fronts - When cold air hits warm air. - Warm air is forced violently up. - Rising air creates clouds, rain, and storms. (FRONTAL LIFTING)

4. Mr. Fetch’s Earth Science Classroom Cold Fronts - When cold air hits warm air. - Warm air is forced violently up. - Rising air creates clouds, rain, and storms. (FRONTAL LIFTING)

5. Mr. Fetch’s Earth Science Classroom Cold Fronts “COLD FRONT” … umm its gets colder, duh!

6. Mr. Fetch’s Earth Science Classroom Cold Fronts

7. Mr. Fetch’s Earth Science Classroom Warm Fronts - When warm hits cold air. - Warm air gently glides up over the cold air. - Rising air creates clouds and showers. (Less Violent).

8. Mr. Fetch’s Earth Science Classroom Warm Fronts “WARM FRONT”… right, it gets warmer, good.

9. Mr. Fetch’s Earth Science Classroom Warm Front

10. Mr. Fetch’s Earth Science Classroom The General Pattern

11. Mr. Fetch’s Earth Science Classroom Stationary Front - When a warm or cold front stops moving. - Usually several days of clouds and showers.

12. Mr. Fetch’s Earth Science Classroom The high’s and low’s of weather… LOW PRESSURE: cyclones 1.Low pressure systems form along fronts. (Unstable) 2.Low pressure systems are areas of rising air. (As along fronts) 3.The wind blows from HIGHS into LOWS. 4.Earth’s rotation causes the winds to rotate counter-clockwise around low pressure systems.

13. Mr. Fetch’s Earth Science Classroom LOW PRESSURE: 5.The rising air creates clouds and precipitation. 6.Low pressure systems created rainy, stormy weather. The high’s and low’s of weather…

14. Mr. Fetch’s Earth Science Classroom HIGH PRESSURE: anticyclones 1.High pressure systems are areas of sinking air. (Stable) 2.The wind blows out of HIGHS to LOWS. 3.Earth’s rotation causes the winds to rotate clockwise around high pressure systems. The high’s and low’s of weather…

15. Mr. Fetch’s Earth Science Classroom HIGH PRESSURE: 4.The sinking air stops clouds from forming. 5.No clouds = Sunny, clear weather conditions. The high’s and low’s of weather…