It's been a rough winter for large swaths of North America. First, a polar vortex plunged much of the Midwest into dangerously frigid temperatures. More recently, a furious wind storm has been pummelling eastern Canada and United States, causing flight delays, school cancellations and thousands of power outages. Along the shores of Lake Erie, the gusts were so strong that blocks of ice surged over the shoreline and formed walls as high as 30 feet—a striking phenomenon known as an “ice tsunami.”
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