1. AIR MASSES & FRONTS http://www.atmos.washington.edu/~ovens/loops/wxloop.cgi?fronts_ir+/48h/ http://www.marcsobservatory.com/mo_whatsit_hemispheres.html

2. air mass- large bodies of air covering land and ocean areas 1. Continental - air mass that forms over land 2. Maritime- air mass that forms over water http://www.youtube.com/watch?v=Kmhizd4De2E http://www.youtube.com/watch?v=kzNR_tjKExU&feature=related

3. CHARACTERISTICS OF AIR MASSES Antarctic- cold mass -forms over the Antarctic Arctic- cold mass –forms over the Arctic Polar- cold mass – forms in polar regions Tropical- warm air mass –form in the Tropics Equatorial- warm air mass –forms at the Equator http://www.videopediaworld.com/video/32291/Weather-Types-Of-Air-Masses http://www.youtube.com/watch?v=rQbqujJGJRg

4. AIR MASSES Read/Complete “Changes in Weather: Air Masses”, pp. 45-46

5. FRONTS Front – the area where two different air masses meet/They move but do not mix! Blue lines are cold fronts and red lines are warm fronts http://www.youtube.com/watch?v=vPC5i6w3yDI&feature=related

6. COLD FRONT Cold Front- when a cold air mass meets up with a warm mass or air a cold front forms---- brings precipitation-afterwards, temp drop, winds change and barometer rises

7. WARM FRONT Warm Front – When a warm air mass meets up with a cold air mass – extended periods of precipitation –afterwards temps usually rise

8. OCCLUDED FRONT a composite front when colder air surrounds a mass of warm air and forces it aloft. http://www.youtube.com/watch?v=LTA2pNiKDXI

9. FRONTS Read/Complete “Changes in Weather: Fronts”, pp. 47-48