Mr. Fetch’s Earth Science Classroom

FrontsA boundary between two air masses:

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When air masses meet…

mTMaritime TropicalMoist, warm air to southeast coast of the US.

mPMaritime PolarMoist, cold air to west coast of the US.

Mr. Fetch’s Earth Science Classroom

Cold Fronts- When cold air hits warm air.- Warm air is forced violently up.- Rising air creates clouds, rain, and storms. (FRONTAL LIFTING)

Mr. Fetch’s Earth Science Classroom

Cold Fronts- When cold air hits warm air.- Warm air is forced violently up.- Rising air creates clouds, rain, and storms. (FRONTAL LIFTING)

Mr. Fetch’s Earth Science Classroom

Cold Fronts“COLD FRONT” … umm its gets colder , duh!

Mr. Fetch’s Earth Science Classroom

Cold Fronts

Mr. Fetch’s Earth Science Classroom

Warm Fronts- When warm hits cold air.- Warm air gently glides up over the cold air.- Rising air creates clouds and showers. (Less Violent).

Mr. Fetch’s Earth Science Classroom

Warm Fronts“WARM FRONT”… right, it gets warmer, good.

Mr. Fetch’s Earth Science Classroom

Warm Front

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The General Pattern

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Stationary Front- When a warm or cold front stops moving.- Usually several days of clouds and showers.

Mr. Fetch’s Earth Science Classroom

The high’s and low’s of weather…LOW PRESSURE: cyclones1.Low pressure systems form along fronts.

(Unstable)2.Low pressure systems are areas of rising air.

(As along fronts)3.The wind blows from HIGHS into LOWS.4.Earth’s rotation causes the winds to rotate

counter-clockwise around low pressure systems.

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LOW PRESSURE:5.The rising air creates clouds and precipitation.6.Low pressure systems created rainy, stormy

weather.

The high’s and low’s of weather…

Mr. Fetch’s Earth Science Classroom

HIGH PRESSURE: anticyclones1.High pressure systems are areas of sinking air.

(Stable)2.The wind blows out of HIGHS to LOWS.3.Earth’s rotation causes the winds to rotate

clockwise around high pressure systems.

The high’s and low’s of weather…

Mr. Fetch’s Earth Science Classroom

HIGH PRESSURE:4.The sinking air stops clouds from forming.5.No clouds = Sunny, clear weather conditions.

The high’s and low’s of weather…