Major Snowstorm for the Northeastern United States - 12-16-2020

This morning’s surface map shows low pressure organizing over the southeastern United States with a low center along the Kentucky-Tennessee border and another center on the South Carolina coast. These lows will merge into one large storm that will dump heavy snow and rain as it moves to the northeast along the East Coast.

The map below shows the northeastern United States. Cold high pressure centered over southeastern Canada. Using the plotted data note the temperatures. If you need help reading the surface model plots, go to our homepage and scroll down to the section about decoding maps. Click on the image to learn the station model plot format. Temperatures range between -15 to - 28 degrees F under the high pressure center.

Meanwhile low pressure is organizing just off the southern edge of this map. Notice how the temperatures and dew points are higher across the southern portion of the map. Readings are below freezing north of the Ohio River and north of Virginia and Maryland. Light snow is indicated at stations in Ohio, Indiana, and Illinois.

There will be more maps and information to follow. For forecasts be sure to follow your local forecasts at www.weather.gov (National Weather Service). That website has links to all forms of weather information about the storm. This website includes links to a massive amount of data and images.

Maps plotted by Digital Atmosphere which is available at www.weathergraphics.com.