National Weather Service United States Department of Commerce

Overview

A sharpening shortwave aloft tracked over the area on December 8th as cool high pressure settled to our north. The surface high was in an ideal position for us to receive winter weather while weak low pressure gradually deepened off the Carolina coast. Widespread lift arrived during the morning of the 8th as the initial push of low-level cold air advection overspread the CWA. Precipitation was initially in the form of rain with surface temps in the mid 30s, but radar data showed that the melting layer was only 1000-1500 feet above the surface at ~9 AM. With CAA continuing throughout the day and latent cooling due to melting in the lowest levels, a quick changeover to snow was observed by late morning. While little accumulation was observed through 11 AM-noon (except in areas N/NW of Richmond where surface temps had fallen to 30-32F), snow continued. The snow picked up in intensity during the early afternoon as temperatures dropped just below freezing all the way down to the Wakefield office. A zone of moderately strong 850-700mb frontogenesis was observed over central VA, with banded snowfall and rates of 1-2"/hour observed from the south-central VA Piedmont to southern RIC Metro to interior SE VA from noon-4 PM. At the Wakefield office, 3.3" of snow fell from 1-3 PM! Only 0.21" of precipitation fell during that time, giving a snow/liquid ratio of 15:1 despite surface temps just below freezing. Farther north, a steadier light snow continued throughout the afternoon. Snowfall rates decreased during the evening with a steady light snow continuing through 7-10 PM. A corridor of 5-7" was observed from the south-central piedmont to Newport News, with a widespread 4-5.5" in the Richmond Metro. The 6.5" at the NWS Wakefield office was the highest storm total snowfall since 1/3/2018! Areas from Caroline County/Tappahannock NE saw little to nothing as the cold/dry air won out there. 
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