1. Air Fronts

2. What’s a front? L Boundaries between air masses L Pressure forms
Warmer mass gets pushed above cold mass (density) L

3. Warm front Moist/warm air mass slides up over cold air mass
Clouds, light/moderate rain/snow
If temps between air masses vary greatly thunderstorms may occur
When front passes warm temps/clear skies

4. Cold Front
Cold air mass pushes under warm air, forcing warm air to rise quickly
Violent storms, heavy rain/hail  short lived
When front passes cooler temps

5. Occluded Front
Warm air mass gets caught between 2 cold air masses
The warm air mass rises as the cold air mass pushes/meets other cold air mass in the middle
Strong wind/heavy rain, cold temps

6. Stationary Front
When masses don’t override one another no/little movement
Clouds/fog
If cold starts to “win” moderate rain/snow

7. P. 86 in NB:
Take a blank sheet of paper hold it horizontally and fold it so that the sides meet in the middle (“French doors”)
Cut the “doors” in half so that you have 4 flaps