1. And everything that comes with it
AIR
And everything that comes with it

2. Air Mass
a huge “bubble” of air that shares the same temperature and amount of pressure (can be big enough to cover several states)
They move all over the earth and cause changes in the weather.
Warm Air Mass: this is an air mass made up of warm air that has a low pressure.
Usually holds a lot of moisture.
Forms over hot land or water.
Low Pressure (L)
Cold Air Mass: this is an air mass made up of cool temperatures and high pressure.
Usually does not hold much moisture
Forms over cold water or land. High Pressure (H)

3. Where air masses meet BUT do not mix
Fronts!
Where air masses meet BUT do not mix

4. These two air masses meet and form a front

5. pushes the warm air up quickly.
COLD FRONT
During a cold front, a cold air mass catches up to a warm air mass and…
pushes the warm air up quickly.
Weather associated with cold fronts is…
Thunderstorms

7. The map symbol for a cold front is a curved line with small…
blue spikes
When cold air catches up to warm air and pushes it up and away, what is formed?...
cold front

8. The map symbol for a warm front is a curved line with small…
Forms when a warm air mass catches up to a cold air mass
The map symbol for a warm front is a curved line with small…
rounded knob

9. When a warm front forms the warm air…
slides over the top of the cold air, before …
pushing it away

11. Comparing Warm and Cold Fronts
Cold fronts move faster than warm fronts.
The weather activity in a cold front is often violent and happens directly at the front
Cold fronts have sudden gusty winds high in the air creating turbulence.
The weather activity in a warm front generally happens before the front passes
In a warm front the cloud formation is very low often creating situations of poor visibility

12. Occluded Front
This kind of front happens when two cold air masses approach each other, and the warm air mass in between them gets pushed upwards. Occluded fronts bring lots of rain, snow, and cold temperatures.

13. Stationary Front
If two air masses meet but neither of them has enough energy to push against each other or move up or down, a stationary front is formed. These fronts bring many days of overcast (cloudy) and rainy weather.