Forecasting the Weather

Fronts

An Air Mass is a large body of air of relatively

similar temperatureand moisture.

(humidity)

Air masses can control the weather for a period of time: from

days to months.

Most weather occurs along the boundaries of these air masses

called fronts.

Cold Front = Stormy Weather

Cold Front = Stormy Weather

                                                  

Warm Front = Rain & clouds

Warm Front

Warm Front = Rain & clouds

                                               

Occluded fronts are produced when a fast moving cold front catches and overtakes a slower moving warm front.

Occluded Front

                                                           

Stationary fronts occur when a cold front and warm front meet and neither one advances. These type of conditions can last for days, producing clouds and no wind.

Stationary Front

Front Symbols

Front Before During After

Warm Colder Rain Warmer

Cold Warmer Thunderstorms Colder

Occluded Cool Precipitation Colder

Stationary No temp. change & no wind

Clouds & rain No temp. change & no wind