We are tracking Winter Storm Iona, which will form right behind the clipper, and impact the Upper Midwest and Great Lakes Saturday night into Sunday. Iona will bring the potential for heavier snow, gusty winds and blizzard conditions, so expect travel to become difficult to impossible Sunday and Monday. One to 3 feet of snow will be possible across portions of Wisconsin and Michigan. Watch this video to see how much snow to expect where you live.

Some of the most active weather in the country is expected to be in Hawaii over the next few days.

We followed a deadly severe weather outbreak as it moved east, bringing the threat of tornadoes, damaging winds and flooding from the Gulf Coast to the mid-Atlantic.

The Van Allen Probe was launched in 2012 to study the radiation belts that surround Earth.

Track everything from current conditions, forecasts and potential impacts from the severe weather outbreak here.