The polar vortex can dip into North America mainly due to a weakened jet stream. In the mid-latitudes, the Twin Tiers is in the mid-latitude, the jet stream is called the prevailing westerlies as ...

The images below show how the influence of climate change from as far away as the mid-latitudes can trigger an outbreak of arctic air over the United States weeks to months later. Unable to view ...

The weather phenomena are common for California winters, but they could cause dangerous debris flows or mudslides in recently ...

When the Polar Vortex is in a weakened state, a jet stream wobble sending polar air into the mid-latitudes becomes more ...

I pick out North America’s celestial highlights for the week ahead (which also apply to mid-northern latitudes in the northern hemisphere).