An Introduction to Types and Formation Air Masses An Introduction to Types and Formation

Air Masses . . . An air mass Air masses are characterized & named by: Is a large body of air located in the lower troposphere Moves together & has similar characteristics throughout Air masses are characterized & named by: Temperature Moisture Content

Air Mass Temperature . . . The Chilly Ones! Extremely cold air masses Called arctic air masses Form between approximately 75°-90° latitudes (N or S) Symbolized by an ____A Cold air masses Called polar air masses Form between approximately 45°-75° latitudes (N or S) Symbolized by a ____P

Air Mass Temperature . . . The Scalding Ones!!! Warm air masses Called tropical air masses Form between approximately 15°-45° latitudes (N or S) Symbolized by a ____T Extremely hot air masses Called equatorial air masses Form between approximately 0°-15° latitudes (N or S) Symbolized by an ____E

Air Mass Moisture Content Moist air masses Form over oceans Called maritime air masses Symbolized by an m____ Drier air masses Form over continents Called continental air masses Symbolized by a c____

Samples Types of Air Masses—Continental cA Continental arctic air mass Could have formed over Antarctica cP Continental polar air mass Could have formed over Canada cT Continental tropical air mass Could have formed over South America

Sample Types of Air Masses—Maritime Maritime polar air mass Could have formed over the northern Atlantic Ocean mT Maritime tropical air mass Could have formed over the Gulf of Mexico mE Maritime equatorial air mass Could have formed over the Pacific Ocean around the equator

Activity Stop in the notes and complete the Global Air Mass Originations Map. For each numbered box, determine which type of air mass would form there (cA, cP, cT, mP, mT, mE) based on . . . Is it over a continent or water? (c___ or m____) Is it in the artic, polar, tropical, or equatorial region? (____A, ____P, ____T, or ____E) Combine the two appropriate symbols and record the air mass type. Check # 1-5 with the teacher before finishing all 24!

Activity Answers #1-5 mP—maritime polar . . . Formed over the ocean and between 45° and 60° latitude mT—maritime tropical . . . Formed over the ocean and between 15°-45° latitude mE—maritime equatorial . . . Formed over the ocean and at the equator cP—continental polar . . . Formed over land and between 45°-75° latitude