Weather Fronts

• The boundary between 2 air masses with different temperatures

• Brings about a change in weather

Warm Front

Passes slowly through an area

Cold Front

Passes quickly through an area…sometimes as fast as 100 km/hr

Stationary Front

Can remain stalled over an area for days

Occluded Front

Website – shows animated process

• http://www.phschool.com/atschool/phsciexp/active_art/weather_fronts/

Fronts – Another Website

• http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/wfrnt/def.rxml

Assignment

• Complete the Compare and Contrast on page 32 and the worksheets on pages 33-34

Cold Fronts Warm FrontsCOMPARE

•Both are boundary lines between 2 different air masses.•Both are formed when a warmer and a cooler air mass meet each other.•Both leave the temperature of the air different than before they arrived.•Both involve cloud formation and rain/snow.•Both create rising air.

CONTRAST

•Created when a cooler air mass overtakes a warmer air mass.•Warm air rises b/c it is pushed up by the cool air and b/c it is less dense.•Steeply sloping curved line front.•Heavy rain and wind.•Passes through quickly.•Cool, dry, and clear skies after•Mainly cumulus type clouds

•Created when warmer air mass overtakes a cooler air mass.•Warm air rises just b/c it is less dense.

•Gentle sloping straight lined front.•Light rain and wind.•Passes through slowly.•Warm, humid, and cloudy after.•Mainly stratus type clouds.

Warm Front ws

Description of a warm frontAnswers to worksheet

1. Warm2. Into/toward/over/thru3. Less4. Cold5. Cold6. Cools7. Front8. Front9. Cirrus

10. Sky11. Altostratus12. Rain13. Snow14. Nimbostratus15. Freezing Rain/hail16. Sleet17. Rises/increases/warms

Cold Front ws

Description of a Cold FrontAnswers to worksheet

1. Cold2. Slower3. Denser/more dense4. Up5. Air6. Vertical7. Moist8. Rise

9. Thick10. Slowly11. 10012. Long13. Temperature14. Winds15. Thunderstorms16. Tornadoes