This May 3, 1999, funnel became the F-5 storm that damaged thousands of buildings in central Okahoma. University of Oklahoma storm chasers and observers are anticipating the annual tornado season as it approaches the central part of the country.
For many, the only way they learn a tornado is approaching are sirens. In the spring and summer, tornado sirens go off a lot more when twisters roar across Alabama, which has been hit by 900 since 2000, accounting for a quarter of all U.S. tornado deaths.
"I am still surprised that so many people rely on just one source of getting warned, and that has to change," said Jim Stefkovich, meteorologist in charge of the Birmingham office of the National Weather Service.
Russia's unmanned Progress space freighter, headed for the International Space Station, blasts off from the Baikonur Cosmodrome in Kazakhstan, Oct. 30, 2011. A string of mission failures has raised concerns over the reliability of Russia's space program.
Venus-Jupiter conjunctions are fairly special events, occurring roughly every 13 months.
If you've had your eye on the western sky after sundown for the last several nights, you've been witness to a breathtaking sight. The two brightest planets, Venus and Jupiter, have been moving (at least from our perspective) ever closer.
On Thursday night, the two planets will line up in conjunction. Venus is about twice as bright as Jupiter, but they are both unmistakable – just look for the bright orbs in the west.
The sun-orbiting <a href="http://www.nasa.gov/mission_pages/soho/index.html">SOHO</a> spacecraft captured this image of filaments erupting off the sun's surface and magnetic plasma blasting into space. The field of view of this image, seen in ultraviolet light, extends some 1.243 million miles from the solar surface.