What Caused the Cold at Ice Bowl II?

By Tom Yulsman | January 5, 2014 6:51 pm

Not Quite Live Blogging of the Packers & 49ers vs The Polar Vortex

Lake Superior Lake Effect Snow Cold

Clouds streaming across Lake Superior are indicative of lake effect snow. This animation of two satellite images consists of a natural-color image of the lake and a false-color image in which red and orange tones show snow on the ground. (Images: NASA. Animated GIF: Tom Yulsman)

As I’m writing this post, I’m watching the Green Bay Packers-San Francisco 49ers game, and the temperature at Lambeau Field is 5 degrees F, with a wind chill of about -12. Not quite Ice Bowl territory, but getting there. And the field sure does look like the frozen tundra…

To the north and west, a frigid wind straight from the Arctic has been blowing across Lake Superior, creating long streamers of lake effect snow.

You can see them in the animation of images from NASA’s Terra satellite above, captured this afternoon. The image that looks like it was snapped on black and white film is actually in true color. The other image shows the scene in false color, with red and orange tones indicative of snow on the ground.

Green Bay, Wisconsin is just to the south, out of the frame. And just in case you’re interested, I am most definitely a Packers fan, thanks to my days living in the wonderful city of Milwaukee back in the ’90s. Unfortunately (from my perspective), the Niners lead 13-10 at the beginning of the second half. I have faith that this will change by the time I finish writing…

But I digress. This post isn’t about the football game per se (although I’ll be coming back to it in just a bit). It’s about winter and the mind-boggling cold.

In case you’re living in, oh, I don’t, maybe Fairbanks, Alaska — where it is an absolutely balmy 17 degrees F as I write this — much of the United States is seeing some of the nastiest winter weather in a very long time. Here’s how the National Weather Service is describing it:

The coldest temperatures in almost two decades will spread into the northern and central U.S. today behind an arctic cold front. Combined with gusty winds, these temperatures will result in life-threatening wind chill values as low as 60 degrees below zero. Also, heavy snow will develop from the eastern Plains to the Great Lakes today, with up to a foot of accumulation possible.

The unusual cold is the result of a phenomenon called the polar vortex. Usually, it keeps cold air bottled up over the Arctic. But sometimes the vortex breaks into pieces.

That’s what’s happening right now, and one of the fragments — a very big chunk indeed — has shifted south, bringing the Arctic with it. (For a detailed explanation of the conditions that set up this cold outbreak, see this post from my colleague Andrew Freedman at Climate Central. And for more detail about the polar vortex, see this post at NASA Earth Observatory.)

Polar Vortex Cold

The polar vortex on January 10, 2009 to the left, and Feb. 2, 2009 to the right. (Source: NASA Earth Observatory)

The images above illustrate this phenomenon. They show the vortex in the winter of 2009 — specifically a property called vorticity, with the red showing the highest values. The red color also is indicative of the coldest temperatures.

In January, strong winds rushing counterclockwise around the Arctic kept cold air bottled up. Then in February, the vortex split in two, and one portion slipped to the south over North America, bringing bone-chilling cold with it. That’s not unlike what’s happening now.

There is some reason to believe that climate change could be playing a role in weakening the polar vortex. But it’s also something that nature can do all by herself. In fact, that’s exactly what she did back in 1967 — during the now legendary Ice Bowl, in which the Green Bay Packers beat the Dallas Cowboys 21-17 at Lambeau for the NFL Championship.  As I write this…


Okay, I digressed again… The 1967 game still stands as the coldest National Football League game ever played. (The temperature at Lambeau right now is still not below zero.) Here’s what the weather map looked like a few days earlier:

Ice Bowl cold weather map

The weather pattern on Dec. 28, 1967, three days before the Ice Bowl. (Source: NOAA)

And here’s what it looks like right now:

Ice Bowl 2 cold

Source: National Weather Service

I don’t know about you, but to my eye they look very similar.

If you’re interested in more detail about the conditions that led to the first Ice Bowl check out this page from NOAA.

Alright! Enough weather geekery for now. I’ve got a game to watch, and the damn 49ers have just scored, making it 20 to 17 in the fourth quarter. But the Pack is coming back — again. What do they know about cold in San Francisco? And wait. HOLD ON…


Epilogue: San Francisco wins on a field goal with three seconds to go. DAMN!

  • http://www.mazepath.com/uncleal/qz4.htm Uncle Al

    climate change could be playing a role in weakening the polar vortex.” Anybody who disagrees with the Greenhouse Effect/Global Warming/Climate Change – especially if said dissent is based upon observation – is thereby proven unfit to comment. Ministry of Truth.

    The chocolate ration has been increased from 300 g.month to 275 g/month. We are winning the War on Productivity. Ministry of Plenty.

  • Daniel Stolte

    “Enough weather geekery?” I don’t think so. More weather geekery would have been nice. I don’t care about football, and the only reason I read this article was because I wanted to learn what the title promised. Instead, I’m being tossed a couple of links to read elsewhere if I want to find that out.

    • Tom Yulsman

      Sorry you feel that way Daniel. Maybe you should actually read the article with an open mind. Or maybe go for a walk, take a few deep breaths, and shrug off your sanctimony. (When was the last time you actually laughed, by the way?) If you do those things you’ll find that I did, in fact, explain very precisely what it says in the headline. If you can’t see that, there’s nothing more that I can say.

    • madi

      that is extremely rude. Are you a scientist? I think not!



ImaGeo is a visual blog focusing on the intersection of imagery, imagination and Earth. It focuses on spectacular visuals related to the science of our planet, with an emphasis (although not an exclusive one) on the unfolding Anthropocene Epoch.

About Tom Yulsman

Tom Yulsman is Director of the Center for Environmental Journalism and a Professor of Journalism at the University of Colorado, Boulder. He also continues to work as a science and environmental journalist with more than 30 years of experience producing content for major publications. His work has appeared in the New York Times, Washington Post, Audubon, Climate Central, Columbia Journalism Review, Discover, Nieman Reports, and many other publications. He has held a variety of editorial positions over the years, including a stint as editor-in-chief of Earth magazine. Yulsman has written one book: Origins: the Quest for Our Cosmic Roots, published by the Institute of Physics in 2003.


See More


Discover's Newsletter

Sign up to get the latest science news delivered weekly right to your inbox!

Collapse bottom bar