Science

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

2. Mr. Fetch’s Earth Science Classroom
When air masses meet…
mT
Maritime Tropica
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…