1. DO NOW: Write in Notebook
Which type of air mass would form near the equator?
What kind of winds blow across our latitudes?
Does dense air rise or sink?

2. How does the air create weather?
Fronts
How does the air create weather?

3. Front The boundaries between air masses
A front is defined as the transition zone between two air masses of different density.

4. Cold Front Colder Warmer Temperatures
Cold air mass is replacing a warmer air mass
Temperatures can drop 15 degrees
Clouds, showers, and sometimes thunderstorms associated with cold fronts
Warmer
Temperatures
Colder

5. Cold Front Colder Warmer Temperatures
Triangles point in the direction the front is MOVING.
Warmer
Temperatures
Colder

7. Warm Front Colder Temperatures Warmer Temperatures
Warm air mass replaces a cold air mass
Air becomes warmer and more humid
Extensive cloudiness and precipitation
Colder
Temperatures
Warmer
Temperatures

9. Stationary Front A front that is not moving
Cold and warm air masses meet

10. Occluded Front
A cold front catches up to a warm front and overtakes the warm front
Precipitation common on both sides of an occluded front

12. Low Pressure Area High Pressure Area “HAPPY” Weather “LOUSY” Weather
(Clear/Calm)
Sinking Air
“LOUSY” Weather
(Cloudy/Precip)
Rising Air