FrontsFronts

FrontsFronts• A front is where two air A front is where two air

masses collide but don’t masses collide but don’t mix. mix.

• Fronts cause storms and Fronts cause storms and changeable weatherchangeable weather

Cold FrontsCold Fronts• Move quicklyMove quickly

• ThunderstormsThunderstorms• Heavy RainHeavy Rain• SnowSnow

• Cold air moves under less Cold air moves under less densedense air, pushing it upair, pushing it up

Warm FrontsWarm Fronts• Move slowlyMove slowly

• DrizzleDrizzle• RainRain• FogFog• Warm WeatherWarm Weather

• Warm air moves over Warm air moves over more dense cold airmore dense cold air

Stationary FrontsStationary Fronts• Hardly move at allHardly move at all

• Many days of cloudy, Many days of cloudy, wet weatherwet weather

• Cold air meets warm Cold air meets warm air. Warm air does not air. Warm air does not rise so they stay rise so they stay separatedseparated

Occluded FrontsOccluded Fronts• Cause clouds, Cause clouds,

rain, or snowrain, or snow

• Warm air caught Warm air caught between 2 cold air between 2 cold air masses. Warm air masses. Warm air is pushed upis pushed up