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]
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
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.
The National Weather Service has warned five states that driving conditions may be difficult as heavy snowfall is expected.
Snow falls on Gold Creek Pond in Washington state. — Credit: Adam Chang/Unsplash For snow to form, there needs to be moisture in the atmosphere and low temperatures. Depending on humidity levels in the atmosphere, when temperatures drop below 0°C (32°F), water vapor condenses directly into ice without going through the liquid stage. Once an ice crystal has formed, typically in clouds, it ...
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