Across the Northern Hemisphere, familiar seasons are starting to feel unfamiliar. Heat waves linger, cold snaps arrive out of sync, and storms stall over the same unlucky regions. At the heart of this ...

A huge winter storm has reignited confusion about the polar vortex, the jet stream and what climate change really means for winter weather ...

Rapid Stratospheric Temperature Spikes Over the Arctic When temperatures in the polar stratosphere suddenly climb, climate analysts instantly recognize this as one of the most critical warning signs.

Each hemisphere hosts two primary jet streams: The polar jet stream is typically found near 50 to 60 degrees latitude, across Canada in the Northern Hemisphere, where cold polar air meets warmer ...

Add Yahoo as a preferred source to see more of our stories on Google. At the same time, every hurricane that formed, including the three powerful Category 5 storms, steered clear of the U.S. mainland.