Air masses map for a geophysical worksheet on severe weather.

You’re working on a Geophysical — Severe Weather worksheet about Air Masses in North America. The task involves labeling a blank map with the correct air mass names and answering four multiple-choice analysis questions.

Let’s solve this step by step.

---

## 🔍 STEP 1: Understanding Air Masses

Air masses are large bodies of air with uniform temperature and humidity. They are classified by source region:

Two-letter codes:

- First letter = Moisture content
- c = continental (dry)
- m = maritime (moist)

- Second letter = Temperature
- T = tropical (warm)
- P = polar (cold)
- A = arctic (very cold) — *sometimes used instead of P for extreme cold*

So, the 5 main air masses affecting North America are:

| Code | Name | Source Region |
|------|-----------------------|-----------------------------------|
| cP | Continental Polar | Canada / Alaska (cold & dry) |
| mP | Maritime Polar | North Pacific / North Atlantic (cold & moist) |
| cT | Continental Tropical | Southwest U.S. / Mexico (hot & dry) |
| mT | Maritime Tropical | Gulf of Mexico / Caribbean (warm & moist) |
| cA | Continental Arctic | Arctic regions (very cold & dry) |

> Note: “tM” is not a standard air mass code — that’s a trick in question #1.

---

## 🗺️ STEP 2: Filling in the Map (Based on Standard North American Air Mass Patterns)

The arrows show where air masses move from their source regions into the U.S.

Here’s how to label the circles based on typical locations:

1. Top left circle (Canada/Alaska) → cP (Continental Polar) — cold, dry air from central Canada.
2. Top right circle (Arctic region) → cA (Continental Arctic) — extremely cold, dry air from the Arctic.
3. Left side (Pacific Ocean, off California) → mP (Maritime Polar) — cool, moist air from the North Pacific.
4. Bottom left (Mexico/Southwest U.S.) → cT (Continental Tropical) — hot, dry air from deserts.
5. Bottom center (Gulf of Mexico) → mT (Maritime Tropical) — warm, moist air from the Gulf.
6. Right side (Atlantic Ocean, near Florida) → mT (again, same as above — can repeat per instructions).
7. Center arrow pointing south into U.S. → likely cP moving south from Canada.
8. Arrow from Gulf northward → mT
9. Arrow from Pacific inland → mP

✔ So, you’ll fill in the circles with:
- cP, cA, mP, cT, mT — and some may repeat (like mT or cP).

*(Since the image isn’t visible to me, I’m assuming standard positions. If your map has 9 circles, assign them as above based on direction and origin.)*

---

## ✔ STEP 3: Answering the Analysis Questions

---

Question 1: Which of the following is NOT the name of an air mass?

Options:
mT — Maritime Tropical → ✔ Valid
tM — ✘ Not valid! There’s no “tM” — it should be “mT”
cA — Continental Arctic → ✔ Valid
cP — Continental Polar → ✔ Valid

➡️ Answer: tM

---

Question 2: Which air mass is most likely to produce a blizzard?

Blizzards require:
- Cold temperatures
- Strong winds
- Heavy snow (needs moisture)

Best candidate: mP (Maritime Polar) — brings cold, moist air from oceans → can cause heavy snowfall when it meets land.

cP is cold but dry → less snow.
mT is warm → no snow.
cT is hot/dry → no snow.

➡️ Answer: mP

---

Question 3: Which air mass is most likely found on the WINDWARD side of the Cascade Mountains in Washington?

Windward = side facing the wind → western side (facing Pacific Ocean).

Air coming from Pacific = mP (Maritime Polar) — cool, moist air.

This air rises over the Cascades → cools → rains/snows on windward side.

➡️ Answer: mP

---

Question 4: Which air mass is most likely found on the LEEWARD side of the Cascade Mountains in Washington?

Leeward = downwind side → eastern side (rain shadow).

After air rises and drops moisture on windward side, it descends, warms, and dries out → becomes cP (Continental Polar) — cold and dry.

Sometimes it can also be modified cT in summer, but generally, leeward side is dry and cooler than mP.

➡️ Answer: cP

*(Note: Some might argue cT if it’s summer, but in general weather patterns, especially for severe weather context, cP is more typical leeward air after mP crosses mountains.)*

---

## ✍️ Final Answers Summary:

Map Labels (based on typical positions):

- Top left: cP
- Top right: cA
- Left (Pacific): mP
- Bottom left: cT
- Bottom center: mT
- Right (Atlantic): mT
- Center arrow: cP
- Gulf arrow: mT
- Pacific inland arrow: mP

*(Fill circles accordingly — use pencil as instructed.)*

---

Analysis Answers:

1. tM
2. mP
3. mP
4. cP

---

✔ You’re all set! Make sure to use a pencil to fill in the map, and double-check that you’ve labeled each circle correctly based on the arrow directions and source regions.

Let me know if you’d like a labeled diagram sketch!