Where exactly did Washington, D.C.’s cold air come from?

NOAA’s Air Resources Laboratory has developed a model that shows backward trajectories, which allow you to trace the path traveled by the air now over the Washington, D.C. area. Such a model can be run either forward or backward in time, helping meteorologists to track where an air mass originated, or predict the movement of smoke or pollutants.

The path shown below should come as no surprise given how cold it is today!…

backward_trajectories

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Kathryn Prociv · January 7, 2014