There have been 888 twisters this year, compared to 1,691 in 2011.
The pattern was active during 2011's deadly tornado season.
Niger, Nigeria, Cameroon and surrounding areas are the hardest hit.
The plume-driven fire has burned in excess of 60,000 acres.
Some of the microbes appear to live high in the atmosphere.
The photographer suffered mild frostbite to get the shots.
The camera revealed a never-seen-before phenomenon.
ATREX mission aims to understand upper level jet stream.
Flash came from storms sweeping across eastern U.S.
Improvements help space telescope detect more terrestrial gamma-ray flashes.
Lighting deaths fall to third cause of storm-related deaths.
River flooding ongoing from Michigan to Tennessee has led to record crests along parts of several major rivers.
Rain and gusty winds will sweep across New England and the Boston area overnight, where the manhu...
Runoff from small streams into progressively larger rivers will continue the flooding risk throug...
Hurricane Sandy's powerful ocean waves sent tremors to the West Coast.
Rebuilt dunes help protect communities from storms.
Ocean waves crash together and create signals in infrasound.
NASA satellite catches nightglow rippling over Texas panhandle.
More water than expected enters stratosphere, where it's a potent greenhouse gas.
Suomi NPP satellite sees mass of marine layer clouds.
Watch from the International Space Station as high-altitude clouds glow.
El Nino and La Nina
Extreme events expected more often in a warming world.
Fall begins at exactly 6:49 a.m. EDT on Sept. 22.
Satellites see greening of trees.
The tilt of the Earth during its yearly orbit creates the seasons, equinoxes and solstices.