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TheH stands for a High Pressure System This usually means CLEAR WEATHER. TheL stands for a Low Pressure System This usually means STORMY weather.

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Presentation on theme: "TheH stands for a High Pressure System This usually means CLEAR WEATHER. TheL stands for a Low Pressure System This usually means STORMY weather."— Presentation transcript:

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3 TheH stands for a High Pressure System This usually means CLEAR WEATHER. TheL stands for a Low Pressure System This usually means STORMY weather.

4 Large areas of air that have the same weather, temperature, and humidity. Weather changes occur as air masses move and interact.

5 A front is the boundary between two air masses. Fronts bring changes in the weather. Because of the wind patterns, they generally move from west to east in the US. behind Fronts are named for the air that is behind them.

6 dense Cold dense air pushes warm air out of the way. Cold fronts move very quickly and bring short periods of rain/thunderstorms. behind Lower temperatures are behind the front. SYMBOL – the direction of the arrows points towards the direction the front is MOVING.

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8 Cold Front

9 Front Awesome Cold Front Time Lapse!

10 displaces Warm air moves up the cold front as it slowly displaces the cold air. Warm fronts move slowly and can bring many days of steady precipitation. Higher temperatures are behind the front. SYMBOL – direction of semicircles is the direction the front is moving.

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12 Warm Front

13 Front

14 The air from the warm front and cold front meet, but do not move. These fronts have weather similar to warm fronts. SYMBOL – warm and cold air masses are moving in opposite directions, thus making a stationary condition

15 Where the warm and cool air meet, water vapor in the warm air condenses into rain, snow, fog, or clouds.

16 Stationary Front Cold Front Warm Front Click for Current Weather Map!

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19 Whats Our Current Local Weather Map? =Fronts

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