In some parts of the United States, it's said that a green sky means there's a tornado on the way. But while you should ...

For many, this color within a severe thunderstorm sparks anxiety and an overall uneasiness. Could it mean that something more dangerous is lurking within the storm itself? The answer is quite complex ...

SIOUX FALLS, S.D. — The sky in one South Dakota city turned an ominous color earlier this week. On Tuesday, Sioux Falls residents saw it turn green just before severe weather moved in. The National ...