Image: ECMWF/Pivotal
January 31, 2021
❄ A coastal low is taking over the weather pattern, and will pummel parts of the United States Megalopolis cities with tremendous snowfall...
Low pressure beginning to wind up in the coastal plains of South Carolina will set the stage for a wallop of snow for some of the major city hubs of the East Coast. Philadelphia, Newark, New York, Boston, and Bangor should all experience hefty snowfall of more than 12 inches, along with windy conditions. Deep, rich Atlantic moisture, with ocean temperatures running warm, will allow for significant precipitation to occur. Combine that with strong High Pressure damming cold air in from the Canadian Provinces will set all of this in motion for a Megalopolis Monster.

Image: SWC Forecast Center
January 31, 2021
You can see the massive coverage of Winter Storm Warnings from Virginia to Maine. Many areas will be under warnings through the day Monday. Most areas can expect snowfall over a foot, but some areas will approach over 2 feet of snow. Do not be surprised if someone in the Adirondack Mountains threaten 30 inches. Only slowly on the day Tuesday will the storm finally push into the northern Atlantic abd away from the United States. This storm could be a harbinger of things to come as we progress through February.

🥶 Forecast Provided By: Meteorologist Joshua Ketchen


  • 🌡 Winter Snowfall Forecast
    Show and hide layers
    🌡 The 2020/21 SWC Winter Snowfall Forecast illuminates a wintry picture over a large portion of America. A La Nina favored large-scale pattern with upper-level ridging in the west and troughing in the east was considered in developing this forecast. Other influences, from the Arctic to the North Atlantic, could play a major role on how storm systems progress across the country.
  • ❄ The SWC Winter Forecast has been released for the 2020-21 Season. Meteorological Winter starts on December 1, 2020 with the U.S. experiencing warmer than normal weather conditions. Our forecasters break down the details of how Winter will play out in your area.
  • ⚠️ U.S Advisory Layers
    SWC Weather Advisory Layers
    ⚠️ Click on real-time watch, warning, and advisory polygons for critical weather information. Allow the SWC location feature to plot your location on the map. Expand the map and visit all SWC Weather Layers.
  • 🧊 As Winter Weather impacts become more frequent across America, it's important to brush up on the basics. Let's review how you can prepare yourself and your family for the worst of Old Man Winter!
    📦 Pack an Emergency Supply Kit.
    📱 Charge all Communication devices.
    🚗 Winterize all family vehicles.
    📖 Get up-to-date weather reports.
    🙌 Share your travel plans with others.
    🛣 Monitor road conditions.
  • 📡 View the latest Goes-16 Visible Satellite image of the United States. This image will update every 5 minutes.
  • 🔥 As La Nina continues to control the overall pattern across the Western U.S., dry conditions are prevailing across Arizona, Utah, and New Mexico. These conditions are forecasted to continue through Winter 2020/21.