Fronts and Weather Maps. Consider This: Uneven heating of the Earth and Earth’s rotation (Coriolis) help create: Winds Jet Stream Currents All are connected.

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Presentation transcript:

Fronts and Weather Maps

Consider This: Uneven heating of the Earth and Earth’s rotation (Coriolis) help create: Winds Jet Stream Currents All are connected to high and low pressure systems.

Remember: High Pressure System: Air cools and falls More pressure from above At surface, air tries to move outward towards low pressure Coriolis causes a clockwise wind flow Fair weather because relative humidity is low.

Remember: Low Pressure System: Air warms and rises Less pressure High pressure tries to flow towards it Coriolis causes a counter-clockwise wind flow Stormy weather because relative humidity is high

High and Low Pressure Pressure Systems Explained

Air Masses A large portion of air that is nearly uniform in temperature and humidity. Cold air masses will move towards warm air masses. Just like high pressure systems move towards low pressure system.

Fronts Boundaries between air masses. Warm front Cold front Stationary front Storms typically develop at fronts.

Fronts Warm Air Front: Warm air is pushing cold air. But warm air is forced over top. Mild precipitation. But brings warmer temperatures.

Fronts Cold Fronts: Cold air pushes underneath warm air. So warm air rises. Severe precipitation. And brings cooler temperatures.

Fronts Fronts Explained

Isobars Lines of equal atmospheric pressure drawn on a meteorological map.

Weather Maps High pressure – H Low pressure – L Warm fronts Cold fronts Stationary

Weather Maps

How to Read a Weather Map