For those of us in the United States, the transition to fall conjures images of autumn leaves, windy days, and brisk evenings—much of this caused by the arrival of cold Canadian air. But what happens elsewhere in the northern hemisphere? Do the cold outbreaks come from the North Pole, Siberia, or elsewhere? In this puzzle, we'll take a look at fall patterns in Europe and western Asia.
TIM VASQUEZ is a former Air Force forecaster and author of Digital Atmosphere, a weather forecasting software program. He lives near Norman, Oklahoma, where he keeps busy as a weather consultant and software developer.