Dynamic storm will affect U.S. East, eastern Ontario and Quebec

Snow, heavy rain and strong winds expected across parts of U.S. and Canadian east. With trees leafed out, this winter storm could cause power outages and more.

Mexico’s Popocatepetl volcano keeps millions of people on alert

The Popocatepetl volcano, located about 43 miles (70 km) southeast of Mexico City, has been spouting ash and vapor into the sky this week.

More jellyfish around the world, says study

Jellyfish are increasing in the majority of the world’s coastal ecosystems, according to a new study.

Early spring in eastern North America compared to rest of globe

New NASA map depicts an early spring in eastern two-thirds of North America in March 2012, when temperatures approached 18 degrees Fahrenheit above normal.

6.7-magnitude earthquake in central Chile

The earthquake took place 26 miles NNE of Valparaiso and 112 kilometers (69 miles) NW of Santiago. No tsunami warning issued. No immediate reports of injuries.

Emperor penguin colonies in Antarctica

Good news for penguin lovers! New satellite images show that there are twice as many emperor penguin colonies in Antarctica than previously thought.

Dead Sea from 1972 to 2011: View from space

Three Landsat images show the expansion of massive salt evaporation projects in and around the Dead Sea, over the span of 39 years.

Tornado outbreak leaves six dead in Oklahoma

At least six people died early Sunday after a tornado outbreak hit in Woodward, Oklahoma. Most of last night's tornadoes struck in Kansas.

National Weather Service tries more urgent voice in storm warnings

Do you think the National Weather Service using words like catastrophic and unsurvivable will help Americans tune in - or tune out - to tornado warnings?

Tornado outbreak potential for US Central Plains

Violent tornadoes appear likely in the U.S. Central Plains on Saturday, April 14, 2012. If you live there, be prepared for today's potential tornado outbreak.