Every major computer model is now forecasting double digit snowfall totals for the D.C. area Friday and Saturday.Chance of at least 1 inch: 90 percent
Chance of at least 4 inches: 75 percent
Chance of at least 8 inches: 65 percent
Chance of at least 12 inches: 50 percent
Chance of at least 20 inches: 15 percent
https://www.washingtonpost.com/news/capital-weather-gang/wp/2016/01/19/forecasts-converging-on-serious-friday-saturday-snowstorm/