WASHINGTON (AP) — La Niña, the cooler and at times costlier flip side of El Niño, has arrived to warp weather worldwide, meteorologists said Thursday. This natural weather phenomenon often ...

The most recent daily Weather World (updated each weekday after 6 p.m.). From the Outreach Studios in the Department of Meteorology and Atmospheric Science at Penn State, this is the most recent daily ...

WASHINGTON — The natural El Nino cycle, which warps weather worldwide, is both adding to and shaped by a warming world, meteorologists said. A new study calculated that an unusual recent twist in the ...

There is a moment each year when the Arctic stops reflecting light and starts holding it. It does not announce itself. Satellites notice first. Then, researchers begin to compare notes. By late summer ...

Join us as we discuss weather prediction and get a behind the scenes perspective on Weather World. For more than 40 years Weather World has been providing an in-depth forecast for Pennsylvania weather ...