Once again, we arrive at a time of change in North American weather: the transition from a warm pattern to a cool pattern. Most of the time, the change is fairly benign, punctuated only by the regular passage of frontal systems sweeping southeast out of Canada and the occasional tropical storm making landfall in the Gulf of Mexico or the Atlantic coast. In this puzzle, we'll take a look at a classic frontal system moving into the eastern United States and break it down bit by bit.
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