Snow clouds usually occur in the context of larger weather systems, the most important of which is the low-pressure area, which typically incorporates warm and cold fronts as part of its circulation. Two additional and locally productive sources of snow are lake-effect (also sea-effect) storms and elevation effects, especially in mountains. [5]

Winter storm to hit two states with up to 20 inches of snow and 60 mph winds expected, bringing major disruptions through Monday.

Heavy snow warning as up to 20 inches to strike 2 states

Snow, the solid form of water that crystallizes in the atmosphere and, falling to the Earth, covers, permanently or temporarily, about 23 percent of the Earth’s surface. A brief treatment of snow follows. For full treatment, see climate: Snow and sleet. Snow falls at sea level poleward of latitude

Snowfall Forecast Forecasted snow in the US for the next 24 hours.

Wondering how much snow has fallen near you? USA TODAY's detailed map lets you explore snowfall accumulation over the past 24, 48, and 72 hours. You can also check seasonal totals starting from Oct. 1. Updated multiple times daily, this tool provides the latest snowfall data. Toggle between timeframes to see how snowfall is adding up in your area.

Snow Today is a NASA-funded research project that examines where snow is present, where it has snowed recently, and how much water is in the snow, while also comparing between snow today, snow yesterday, snow last year, and snow over the last few decades.