Less than a month after a tornado outbreak devastated the U.S. southeast, a deadly twister touched down in the town of Joplin on Sunday.
Tornadoes claimed the lives of at least 313 people -- the deadliest tornado tragedy to strike the United States since 1974.
Beyond the dramatic videos and the devastating stories, the sheer intensity of the storms has many wondering what's going on.
Deadly tornadoes left a trail of destruction and death through U.S. southern states.
Twenty people have died and hundreds more have had to evacuate their homes as a massive storm system looms over the region.
We've seen snow in the Midwest, wildfires in Texas and a surge of tornadoes across the country. What's going on with the weather?
Although climate change is a suspect, the trend could simply be a part of natural cycles that drive wind speeds up and down.
A rare thundersnow event was recorded by NASA instruments, showing lightning traveled for 50 miles in low clouds.
There is twice as much dust in the atmosphere as there was 100 years ago, with consequences on global climate and ecology.
Airborne dust seems to settle like broken glass, concludes a new finding that could help improve climate models.