1. High Pressure vs. Low Pressure

2. H is for “HIGH PRESSURE”
H is for HEAVY
BLUE = COOLER
Cool air contracts
Cool air sinks because COOL air is HEAVIER
Sunny but slightly cooler weather
Heavy shoves clouds out of the way
CLEAR SKIES
Dry air
Pressure increases which makes it heavier

3. L is for “LOW PRESSURE” L is for LIGHTER RED = WARMER
Light air/low pressure expands
Warm air rises because warm air is LIGHTER
Often brings rainy/snowy weather
Humid, moist air
Pressure decreases which makes it lighter

4. Cold Front vs. Warm Front

5. COLD FRONT Looks like icicles Has air that is HEAVY
A cold front has COLD(cooler), dry air behind it as it moves forward
When a cold front meets a warm front, it shoves the warm front up higher
Brings THUNDERSTORMS
Pp. 600

6. WARM FRONT Looks like half suns A warm front has warmer,
moist air behind it.
When it moves over a cold front, it will rain near the frontal line where the rising air condenses.
Pp. 600

7. HIGH PRESSURE Spins Clockwise No cloud cover Page 602 Pulls air down
Cooler, Dry air
Page 602

8. LOW PRESSURE Spins Counterclockwise Forms clouds Brings possible:
Rise UP
Forms clouds
Warmer, moist air
HUMID
Brings possible:
Tornadoes
Hurricanes
Page 602

9. COLD FRONT (pg 600)

10. WARM FRONT (pg 600)

11. Weather Forecasting Sample Forecast: Weather Channel:
Weather Channel: