We don't measure a tornado's strength while it's happening (it would destroy the sensors). Instead, we use the to estimate wind speeds based on the damage left behind. Wind Gusts (3-sec) Potential Damage EF0 65–85 mph Light: Branches broken, signs damaged EF1 86–110 mph Moderate: Roof tiles stripped, mobile homes pushed EF3 136–165 mph Severe: Entire stories of houses destroyed EF5 Over 200 mph Incredible: Strong frame houses leveled and swept away Stay Safe: Watch vs. Warning Knowing the difference can save your life.

Should I focus more on or safety tips ? Are you targeting a specific region (like Tornado Alley)?

: As the warm air rises (an updraft), it begins to cool and condense, forming towering cumulonimbus clouds.

A tornado is a violently rotating column of air extending from a thunderstorm to the ground. While scientists are still researching the exact "trigger," they know that a successful requires:

Here is everything you need to know about how these storms form, why they happen, and how to stay safe when the sky turns green. How Storms Are Born: The Recipe for Chaos

: Survivors often describe the sound of an approaching tornado as a loud roar, similar to a freight train .