fromwww.theguardian.com
2 weeks agoWeather tracker: US hit by exceptional early winter cold spell
Areas along the southern and western coasts of Lake Michigan experienced a phenomenon known as lake effect snow on Monday. This develops when cold air which covered the US this week moves over the relatively warm water of a lake or inland sea. This produces convection and heavy showers that move inland downwind of the lake, and can continue for hours or even days on end. Snowfall totals can be extremely localised and are notoriously difficult for forecasters to predict.
Environment
