A strong, stable vortex is like a skater spinning with their arms tucked closely in, holding in an area of cold air over the Arctic. But when there’s a wobble in the rotation, winds in the vortex can ...

As we continue to warm moving into February, it appears latest trends suggest a classic "what goes up, must come down" type ...

While jet streams are air patterns, the Gulf Stream is an ocean pattern that also has an impact on weather.

It was flying from Dover, Delaware, to Ramstein, a U.S. Air Force installation ... The jet stream forms as warm air from the ...

While Thursday temperatures will finally get above freezing, 7News Senior Meteorologist Brian van de Graaff said “it will still be colder than average.” He noted the average for this time of ...

As the polar vortex delivered what is expected to be its final blast across southern Ontario on Wednesday, city residents braved the bitter cold — including Fintan the lion at the Toronto Zoo.

A blast of arctic air from Canada has brought the season's coldest weather to most of the United States. The system, known as a polar vortex, is forecast to bring subzero temperatures to the Midwest, ...

A winter storm will bury parts of the Deep South with snow through early Wednesday. Here’s a forecast for key cities in its path.

A dangerous and potentially life-threatening stretch of cold weather has much of the U.S. on alert as a lobe of the polar vortex invades the nation and sends temperatures tumbling to levels not ...

However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is bringing an even harsher arctic blast to million Americans this week. Maps show what to expect as the cold front ...

However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is bringing an even harsher arctic blast to million Americans this week. Maps show what to expect as the cold front ...

The province's coroner is investigating. At Refuge de Laval, an emergency shelter north of Montreal, co-ordinator Vanessa Garreffa said they've been preparing for the cold temperatures for a ...