Lake-effect snow forms when cold air from Canada moves over warmer lake waters, creating a process where moisture is absorbed and heavy snowfall occurs at the lakes' windward areas.
Due to a strong low-pressure system over eastern Canada, frigid Arctic air swept down, leading to significant snowfall across parts of Ohio and Pennsylvania, with locations accumulating over 90cm.
The most substantial snowfall amounts from recent events peaked at Girard, Pennsylvania, where 162cm was recorded, demonstrating the extreme weather conditions affecting the region this winter.
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