North American Air masses

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Presentation transcript:

North American Air masses MENU

Air Masses There are four types of air masses: Continental Polar (cP)= dry and cold Maritime Polar (mP)= moist/humid and cold Continental Tropical (cT)= dry and warm Maritime Tropical (mT)= moist/humid and warm Write the information below off to the side of the 4 air masses Continental= over land (dry air) Maritime= over water (moist air) Polar= cold Tropical= warm MENU

Fronts A front is the boundary separating air masses of different densities Fronts extend both vertically and horizontally in the atmosphere MENU

Cold Front Cold Front: The zone where cold air is replacing warmer air (Draw the symbol for cold front next to these notes) In U.S., cold fronts usually move from northwest to southeast Air gets drier after a cold front moves through MENU

Warm Front 2. Warm Front: The zone where warm air is replacing colder air (Draw the symbol for warm front next to these notes) In U.S., warm fronts usually move from southwest to northeast Air gets more humid after a warm front moves through MENU

Stationary Front 3. Stationary Front: When either a cold or warm front stops moving (Draw the symbol for stationary front next to these notes) When the front starts moving again it returns to either being a cold or warm front MENU

Occluded Front 4. Occluded Front: Formed when a cold front overtakes a warm front This occurrence usually results in storms over an area In U.S., the colder air usually lies to the west MENU

Occluded Front MENU

High & low pressure High pressure causes air to sink Usually results in several days of clear sunny skies MENU

High & low pressure High pressure systems usually signal more fair weather with winds circulating around the system in a clockwise direction. MENU

High & low pressure Low Pressure: Air rises in low pressure areas and forms water droplets Can results in rain and storms MENU

High & low pressure Low pressure systems with counterclockwise circulating winds often result in rainy and/or stormy weather conditions. MENU

Low Pressure and Fronts Cause Lift

Low Pressure System MENU