Weather to put on a weird show this winter

WASHINGTON -- Get ready for weather whiplash as powerful climatic forces elbow each other for starring roles in a weird winter show.

See Full Article

The spine-chilling polar vortex is taking center stage in Europe and bringing persistent cold to much of North America - except in Hollywood, where soggy El Nino won't give up the spotlight.

After El Nino delivered a balmy Christmas Eve to the eastern U.S. and shattered national records with a warm, wet and wild December, Minnesota may host one of the coldest NFL playoff games in history this Sunday, with wind chills around -29 C, meteorologists predict.

"The biggest thing is this whiplash," said University of Oklahoma meteorology professor Jason Furtado. "It's going to be a shock for people."

The center of the cold blast starts this weekend in the U.S. in the upper Midwest, and then moves to the Hudson Bay area next week, while in Europe it starts in the east and north and then spreads, Furtado said. Europe may have to get used to temperatures 20 or so degrees below normal.

"Temperature will be dominated by the impact of the polar vortex," said Judah Cohen, seasonal forecast chief for the private Atmospheric and Environmental Research company outside Boston. It will feel similar to 2013 and 2014, he said.

Americans became painfully familiar with the polar vortex during those winters. This time, America's winter temperatures will depend on when the wet and warm El Nino pushes itself back to prominence, Furtado said.

"We have all of these large and unusual events happening all at the same time and I don't think it has ever happened before," said Rutgers University climate scientist Jennifer Francis.

For a winter this dramatic, it may help to consult the program:


The star is El Nino, a veteran of this stage for a few decades now. This natural warming of the central tropical Pacific occurs every two to seven years or so, and changes weather worldwide, especially in the Americas and Asia. It is closely associated with heavy rain in California, and general warming. It has less effect in Europe because that's further away. With its flipside, La Nina, it is known as the El Nino Southern Oscillation, and it lasts about a year.

Playing off against El Nino is the Arctic Oscillation, and its index measures differences in atmospheric pressure between the Arctic and mid-latitudes. When the AO is positive in the winter, polar air stays trapped up north and the weather is relatively mild further south. When the AO is negative, the cold Arctic air escapes and plunges into lower latitudes, treating the United States and Europe to the polar vortex - a swirling air mass that carries spine-chilling temperatures.

The North Atlantic Oscillation is a bit player with a big influence over Europe's weather. As with its Arctic cousin, the more negative its index, the colder the continent becomes.

The jet streams also are important to watch. These rivers of air heavily influence local weather everywhere, carrying storms and clearing skies around the planet. Usually in the winter, the jet stream that affects most people in the United States and Europe moves relatively straight from west to east. But when it weakens, it can plunge south and north and even get stuck at times, creating odd extremes.

Another air pattern playing a small but key role is the Madden-Julian Oscillation, which travels in the warm parts of the Indian and Pacific oceans, and may have triggered changes that "flipped the switch" in December, Furtado said.

Still other characters may be a factor in making the jet streams oscillate more wildly: A huge blob of warm water in the northern Pacific, unusually low sea ice levels in the Arctic's Barents Kara sea area; a cool patch of water off Greenland, likely from melting ice sheets and glaciers; winter storm Frank that hit England; and of course man-made climate change.


This was last month. El Nino appeared in classic form, tying 1997-1998 for the strongest on record. The Arctic Oscillation was very positive, trapping cold air in northern latitudes. With so many warm, wet days further south, spring flowers popped up and trees bloomed in December.

"It's not surprising we were 70 degrees (21 Celsius) on Christmas Day," said Mike Halpert of the National Oceanic and Atmospheric Administration's Climate Prediction Center in College Park, Maryland.

El Nino often spawns winter tornadoes in the southern U.S. and they appeared on cue, killing two dozen people in just four days. The heavy rain that flooded the Mississippi River Valley isn't usually an El Nino signature though, Cohen said.


The switch flipped: The Arctic Oscillation and its North Atlantic sidekick went negative big time.

"When it's a negative AO, that's when people start mentioning the words 'polar vortex'," Halpert said.

This time, there's cold air, but it's mostly dry so far, despite El Nino, which still spawns a series of rainstorms hitting California. Meteorologists say wetter weather could bring heavy snowstorms, but that's not likely for another week or more, although cities along the Great Lakes may get lake effect snow.

So far the east-moving moisture from El Nino is staying south of the Arctic plunge, but that may change.

For now, the AO is dominating in its fight with El Nino, especially in Europe, Cohen said. NFL players and fans will likely brave temperatures around one below zero in Minneapolis.


No spoilers here. Will the polar vortex hold the stage for weeks or months? Will the cold AO and wet El Nino combine for whopper snowstorms?

Rutgers' Francis doesn't think the moisture and the cold can keep avoiding each other, saying "we're going to have major major dumps of snow. We just don't know where."

Furtado predicts El Nino will push aside the cold in America, but not in Europe, where it has less of an influence. Cohen is less certain about what will happen as these forces morph and interact over time.

"There's a lot going on; the weather has been crazy," Cohen said. "Expect the unexpected."


Latest Tech & Science News

  • Iceland is poised to elect a party of hackers and internet-freedom activists

    Tech & Science CBC News
    The past few years have been stormy for Iceland, a country threatened by volcanoes and brought low by bankers. Now, Icelanders are thinking of putting their trust in pirates. Polls suggest the party — formed in 2012 by a group of anarchists, hackers and internet-freedom activists — is supported by as many as one in five voters and could emerge from Saturday's parliamentary election at the head of a new government. Source
  • LIVE blog: Tech companies show off innovations in Toronto

    Tech & Science CTV News
    Many Canadians dream of being a successful entrepreneur, inventor, and even the next Bill Gates, Steve Jobs or Mark Zuckerberg. Today, many of those innovative Canadians are convening in Toronto for a one-day summit hosted by Google called Go North. Source
  • Family sues Amazon over hoverboard that burned $1M house

    Tech & Science CTV News
    NASHVILLE -- A family is suing Amazon for selling a hoverboard blamed for starting a fire that burned their $1 million home in Nashville. The Tennessean reports that the Fox family's lawsuit says Amazon had information about the dangers of the product before the Jan. Source
  • World's largest marine reserve created in Antarctic sea

    Tech & Science CBC News
    The countries that decide the fate of Antarctica's waters reached an historic agreement on Friday to create the world's largest marine protected area in the ocean next to the frozen continent. The agreement comes after years of diplomatic wrangling and high-level talks between the U.S. Source
  • 'This is history': International agreement creates vast Antarctic marine reserve

    Tech & Science CBC News
    The countries that decide the fate of Antarctica's waters reached an historic agreement on Friday to create the world's largest marine protected area in the ocean next to the frozen continent. The agreement comes after years of diplomatic wrangling and high-level talks between the U.S. Source
  • Images show Prince Harry working to help elephants in Malawi

    Tech & Science CTV News
    Photos Source
  • China goes from red-alert pollution to green energy

    Tech & Science CBC News
    The city of Foshan is in the middle of China's manufacturing heartland. It may be big and noisy, factories gushing consumer products and pollution, but its new city bus glides along almost silently, producing no pollution at all. Source
  • Cellphone use skyrockets. Bills jump. Time to be freed from data caps?

    Tech & Science CBC News
    Our cellphones are so much more than phones these days. They've become a lifeline, the way we connect to everything from banking and breaking news to the loved ones in our lives. So it likely comes as no surprise that wireless internet data usage continues to skyrocket in Canada, and that we're spending more to feed our habit. Source
  • Fish and politics fuel Antarctic marine reserve deal

    Tech & Science CTV News
    WELLINGTON, New Zealand - Nations from around the world on Friday reached an historic agreement to preserve an area of ocean near Antarctica that's about twice the size of Texas. Here are some questions and answers about the deal: Source
  • Police access and use of 7,500 mobile phone numbers raises privacy fears

    Tech & Science CBC News
    Privacy and legal experts across Canada say serious privacy questions need to be asked about an "extraordinary" and "unprecedented" move by Ontario Provincial Police to send text messages to about 7,500 people for information about an unsolved homicide. Source