What type of weather will a LOW pressure system bring? As a low pressure system approaches the pressure will drop due to rising air. As the air rises it cools and water vapor condenses forming clouds. As the low moves away temperatures usually drop because the air is coming from the north/northwest on the back side of the low.

What type of weather will a HIGH pressure system bring? As a high pressure system approaches the pressure will rise due to sinking air. As the air sinks it does not allow clouds to form. As the high moves away temperatures usually rise because the air is coming from the south/southwest on the back side of the high.

Describe conditions associated with frontal boundaries that result in severe weather. When a cold air mass collides with a warm air mass a Cold Front forms.

The cold air mass plows under and quickly lifts the warmer, less dense air There are strong upward motions that causes vertical (tall) clouds The slope of the cold front is very steep Intense rain and thunderstorms may occur