The map marks five North American air mass source regions with the letters A through E. Which two-letter code describes the air mass that forms over the region marked A?

Look at the map of North American air mass source regions, lettered A through E. What code names the air mass that forms over the region marked B?

A weather student is asked to classify the air mass whose source region is marked C on the North American map, lettered A through E. Which code fits?

On the lettered map of North American air mass source regions, what two-letter code describes the air mass forming over region D?

The map lettered A through E marks North American air mass source regions. Which code applies to the air mass that develops over region E?

This map marks four North American air mass source regions, lettered A through D. Which code describes the air mass forming over region A?

Using the lettered map of air mass source regions, which two-letter code names the air mass that forms over region B?

The map marks air mass source regions A through D. A forecaster needs the code for the air mass that forms over region C. Which code is it?

On the map of air mass source regions lettered A through D, what code describes the air mass that forms over region D?

In July an air mass that formed over the warm water of the Gulf of Mexico moves into Georgia. What weather does its arrival typically bring there?

In January a cP air mass moves south out of central Canada into Minnesota. What weather does its arrival typically bring?

In February a cA air mass surges out of the Arctic Basin into North Dakota. What weather does the arrival typically bring?

In December an mP air mass moves ashore in western Washington from the North Pacific. What weather does its arrival usually bring?

In July a cT air mass forms over the Mexican Plateau and drifts into southern Arizona. What weather does the arrival typically bring?

An mT air mass moves into the Ohio Valley in early June, and the overnight low barely drops before sunrise. Why does the mT arrival explain the shallow overnight cooling?

A cP air mass replaces an mT air mass over Illinois in late October, and forecasters predict a sharp overnight temperature drop under mostly clear skies. Why does the cP arrival explain both?

A forecast briefing describes the incoming air mass as continental arctic. Over what kind of surface did that air mass form?

A forecast briefing describes the incoming air mass as continental polar. Over what kind of surface did that air mass form?

A forecast briefing describes the incoming air mass as maritime polar. Over what kind of surface did that air mass form?

A forecast briefing describes the incoming air mass as continental tropical. Over what kind of surface did that air mass form?

A forecast briefing describes the incoming air mass as maritime tropical. Over what kind of surface did that air mass form?

A station briefing labels an approaching air mass cP. Which real region is a documented source for it?

In January a cP air mass sits over interior Alberta while an mT air mass sits over the Louisiana Gulf Coast. Which statement compares their properties correctly?

In April an mP air mass sits off the British Columbia coast while a cT air mass sits over the Sonoran Desert. Which statement compares their properties correctly?

In February a cA air mass sits over the Canadian Arctic Archipelago while an mT air mass sits over the Gulf of Mexico. Which statement compares their properties correctly?

In winter a cP air mass sits over Manitoba while an mP air mass sits over the Gulf of Alaska. Which statement compares their properties correctly?

In summer an mT air mass sits over the Bahamas while a cT air mass sits over the northern Mexican Plateau. Which statement compares their properties correctly?

A cP air mass leaves Saskatchewan and crosses the unfrozen water of Lake Superior in November. How does that crossing modify the air mass?

An mP air mass forms over the North Pacific and crosses the Rocky Mountains moving east into Montana. What change has occurred by the time it reaches the eastern slope?

An mT air mass forms over the Gulf of Mexico and moves inland over Louisiana on a summer afternoon. How does daytime heating over land modify it?