🔍 Key Concepts

• Air mass notation: what do the letters m, T, and w each stand for? • Source regions for air masses: where do maritime tropical air masses typically form? • Difference between land (continental) and water (maritime) source regions.

💭 Think About

• First, decide which answer choices are mostly land and which are mostly water. • Next, think about which areas are associated with warm, humid conditions versus cold, dry conditions. • Ask yourself: does an air mass labeled mTw come from a cold, high‑latitude land area or a warm, low‑latitude water area?

✅ Before You Answer

• Make sure the location you choose is over or strongly influenced by warm ocean water (maritime). • Confirm the latitude: a tropical air mass should not come from a high‑latitude region like Alaska or northern Canada. • Verify that the source region you pick is known for producing warm, moist air rather than cold, dry air.