1. Warm, Occluded, and Stationary Fronts

2. Warm Fronts: occurs when a warm air mass slides over a cold air mass
Relatively stable
Moves slower than a cold front
Long transition from cold air to warm air (warm air moves slowly)
Temperature gradually rises
Clouds and precipitation (lighter rain that lasts longer)
Red line with semi-circles in the direction of warm front movement

3. Red line with semi-circles in the direction of warm front movement

4. OCCLUDED FRONT: when a cool front catches up with a warm front.
Made of 3 air masses, in order from front to back, are cold, warm, and then cold again.
Causes a drop in temperature
Fierce weather at the occlusion (precipitation and shifting winds are typical)

5. OCCLUDED FRONT
Purple line with alternating triangles and semi-circles in the SAME DIRECTION.

6. STATIONARY FRONT
= when air masses are stopped by a barrier, such as a mountain range, or when they are stopped by each other.
May bring days of rain, drizzle, and fog.

7. STATIONARY FRONT
Weather map = alternating blue triangles pointing in the direction of the cold front and red semi-circles point in the direction of the warm front (OPPOSITE DIRECTIONS).

8. WEATHER SYMBOLS

9. WEATHER SYMBOLS “L” stands for a low-pressure area.
Where warm air is rising, carrying moisture that then condenses into clouds.
Cloudy skies and rain.
“Light” air   

10. WEATHER SYMBOLS “H” stands for a high-pressure area.
“H” stands for a high-pressure area.
Air is heavier and sinking towards the ground.
Clear skies because the air is sinking.
“Heavy air”

11. WEATHER SYMBOLS
Dark lines = ISOBARS = measurements of atmospheric pressure
“bar” refers to atmospheric pressure (“barometer”)
The closer the lines are together, the windier it is (higher wind speeds).