Description:

The correct answer is:

✅ Wall Cloud

Why?

A wall cloud is a lowered, rotating cloud base beneath a thunderstorm (often cumulonimbus).

It’s a key tornado precursor because:

Marks the area where warm air is being pulled violently upward.

Rotation within it can tighten into a tornado.

Visual Clues:

Located below the main storm cloud.

Often dark and ominous, with visible rotation.

Why Not the Others?

❌ Stratus: Flat, featureless clouds (no rotation).

❌ Cumulus: Puffy fair-weather clouds (unless stacked into storm clouds).

Fun Fact: Not all wall clouds produce tornadoes—but 90% of tornadoes come from them! 🌪️⚠️

Always seek shelter if you see one! 🏠🌀