Analyzing 60 years of tornado data with an animation


With tornadoes in the news lately, I wondered how I might could use SAS to analyze tornado data. How about animating 60 years of tornado path data? ...

I was using Google to search for ways to analyze tornado data, and found an example on that animates the tornado path data, by month, for the last ~60 years. I thought it was very enlightening how the tornadoes consistently affected certain areas of the US during certain months of the year.

I thought "Hey, that's pretty cool! ... Let's try that with SAS!"

So, I dug up my old tornado tracking map from last year, and added just a few lines of code to use the new SAS 9.4 gif animation syntax, and added a 'by month' to my Proc Gmap ... and now I've got the desired animation!



About Author

Robert Allison

The Graph Guy!

Robert has worked at SAS for over 25 years, and is perhaps the foremost expert in creating custom graphs using SAS/GRAPH. His educational background is in Computer Science, and he holds a BS, MS, and PhD from NC State University. He is the author of several conference papers, has won a few graphic competitions, and has written a book (SAS/GRAPH: Beyond the Basics).


  1. Grant Sargent on

    Cool animation - Just curious - Is there a reason that there are lots of long lines in the map - do tornados travel hundreds of miles, or do they touch down, then disappear again? (from a land of long white clouds, not tornados)

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