The sky doesn't turn a specific color before a tornado. While we often see dramatic weather changes with tornadoes, the colors aren't a reliable indicator.

Here's why:

* Tornadoes form in various weather conditions. Some might be associated with dark, stormy skies, others with clear skies.

* The color of the sky depends on many factors, including the angle of the sun, cloud cover, and atmospheric conditions.

* The most noticeable change before a tornado is often a sudden, dramatic shift in wind direction and intensity.

Instead of focusing on color, here are some signs of impending tornadoes:

* Dark, greenish-colored sky: This might indicate a large, dense storm cloud, but it's not a guaranteed sign of a tornado.

* Rotating clouds: A visible swirling pattern in the clouds is a strong indicator of a tornado.

* Loud, roaring noise: A deep, rumbling sound indicates strong winds and could signal an approaching tornado.

* Hail: Heavy hailstorms can precede tornadoes.

* Rapidly changing weather: A sudden drop in temperature, a change in wind direction, or an increase in wind speed can all be warning signs.

Remember: If you see any of these signs, seek immediate shelter in a sturdy building or underground. Stay informed about weather warnings and follow instructions from local authorities.