I apologise for the lack of posts over the last two weeks, but I was on holiday. Naturally, I have returned just in time for some snowstorms in the Midwest. But today’s piece comes from WGN and it explains how the type of winter precipitation that falls depends not solely on ground temperatures. Rather, temperature profiles in the upper atmosphere can make all the difference between rain, sleet, and snow.
How temperatures create different precipitation types
Credit for the piece goes to Steve Kahn and Jennifer Kohnke.
If you live in the United States, you probably have heard the term polar vortex by now. People have been using the term to describe the bitterly cold temperatures affecting the eastern two-thirds of the country. But the term polar vortex is a meteorological term that means a specific phenomenon. In other words, it’s more than a hashtag along the lines of snowmageddon. The Washington Post explains what the polar vortex is.
The Post explains the polar vortex
My caveat for this piece is that from my understanding, it’s not entirely correct. Or perhaps not detailed enough. In brief, we turn to the National Weather Service out of New York for a more technically correct, but more poorly designed graphic.
National Weather Service explanation
Poor type, poor colours, poor hierarchy. Those are abundantly clear, but the important part is that the NWS wants to correct many of the popular misconceptions. Somewhere between the well-intended but less-than-entirely-clear Post piece and the accurate-but-also-unclear National Weather Service piece is an opportunity to explain the concept to the public.
Credit for the Washington Post piece goes to Bonnie Berkowitz, Richard Johnson, Katie Park, and Gene Thorp.
Credit for the National Weather Service goes to the graphics team at the National Weather Service of New York.
Most of us have likely seen the wind map by Fernanda Viegas and Martin Wattenberg. However, this new wind map takes the idea and makes it a bit more useful. It offers the user the opportunity to look at winds at different levels of the atmosphere. Or you can look at different projections. Some projections show wind patterns better than others. You can also see wind across the world, not just the United States.
On 8 November, Typhoon Haiyan made landfall in the Philippines, killing what may well be 10,000 people. The New York Times covered much of the damage in Tacloban, perhaps the hardest hit city, in this interactive graphic.
Structural damage in Tacloban
Credit for the piece goes to the New York Times graphics department.
Yes, yes it is. This map from the Washington Post looks at global temperature change since 1901. The article it supports is about how scientists are now all but certain mankind is responsible for global warming. Personally I prefer the term climate change because global warming sounds as if everything warms and as this map shows, clearly that is not the case.
Snow should fall upon Chicago this afternoon and it may measure up to a few inches in depth. But much of this winter has been below average. And that is much the same from last year when snowfall did not even reach 20 inches.
I went through NOAA data to look at the last decade of monthly snowfall to see just how little snow has fallen this winter. (Not a lot.) And then I looked at the entirety of the NOAA records to see where 2011/2 fit in the span of winters. (One of the least snowy.) This graphic is the result.
This weekend I researched meteorological data for a graphic that I will post tomorrow. But in doing that research I came across a series of weather infographics from WGN that are better than the average. The one below details the snowstorm due to impact the Chicago area and how it will form (along with the storm that brought a few inches of snow last week).
The setup for this week's snowstorm in Chicago
Credit for the piece goes to Jennifer Kohnke and Faye Shanti.
If you do not live on the East Coast, you may be unaware that there was some minor snowfall in New England over this past weekend. The Weather Channel went ahead and named the storm Nemo. (I’m going to lay off the suspect and fishy jokes.) I wanted to revisit the storm because of two graphics that both mapped snowfall totals.
The first is from the New York Times. As one would expect, a quality graphic with clear colour ranges to show the impact across the wider New England area, western New York and New Jersey.
The New York Times snowfall totals
But from the local radio station WNYC came an interesting map of users’ observations. Because it’s a local radio station, the difference between the two versions is that the breadth of data is not as far-reaching as the Times’ data from the National Weather Service.
The limits of WNYC user-reporting
However, this sort of user-created data allows for more nuanced, locally-specific data visualisations.
User-reported snowfall in the near New York area
Of course, this creates issues with the accuracy of the data. And in the case of this map, whether the amount given was a snapshot of the snowfall at the time the snow was falling or the final tally.
Credit for the pieces go to the New York Times, and to Steven Melendez, Louise Ma and John Keefe for the WNYC piece.
So that fishy little storm the Weather Channel called Nemo—you may have heard of it—put a little snow across New England. Last week the New York Times published an interactive infographic that looked at when and where the snow would be falling, from New Jersey to New York to Maine.
The storm at or near its worst
The times are cut into six-hour blocks and show in the upper left where the snow would be falling by rate per six-hours. To the right of the map is a series of bar charts that show the snowfall pattern in more or less of a wave. Beneath all of it are a comparison of when, over the last several decades, the largest snowstorms hit Boston and New York (and how much snow each city received). A comparison of the map before to the end of the storm, except for parts of Maine.
The forecast for after the worst had passed
Credit for the piece goes to Tom Giratikanon, Matthew Ericson, Xaquin G.V., Archie Tse, and Jeremy White.