National Weather Service United States Department of Commerce

Overview

Yet another winter storm impacted the Wakefield CWA…and this one was arguably the most significant of them all in terms of snow totals (although there were very few power outages with this storm). 1050mb+ Arctic high pressure built across the Plains on 2/18, and the expansive Arctic airmass entered the Mid-Atlantic during the early morning hours of 2/19, as temperatures dropped into the upper teens to mid 20s with single digit dew points. Meanwhile, a northern stream shortwave was approaching from the west during the early morning hours of 2/19 while a southern stream shortwave entered the Deep South. These two features would eventually phase later in the day. The phasing of these two shortwaves helped to bring significant snowfall to southern portions of the CWA. But before that, mid-level warm advection/isentropic lift overspread the area during the morning of 2/19, bringing a period of light snow to areas near and north of I-64. While snowfall rates were only 0.1-0.5” per hour, the cold temperatures allowed for snow to quickly accumulate on area roadways. Totals of 1-2” were common by early afternoon across the Richmond Metro.

As the two shortwaves began to phase during the afternoon, surface low pressure deepened off the Carolina coast. On the northwest flank of the low (over SE VA and NE NC), an area of 850-700mb frontogenesis began to consolidate. In addition, model cross sections/soundings showed some very weak elevated instability. This allowed for moderate to heavy snow to quickly develop over SE VA and NE NC with rates of 1-2” per hour common. The moderate to heavy snow continued through the evening/early overnight hours as the surface low deepened as it tracked up the coast. In addition, snowfall rates increased from the south-central VA Piedmont to the Richmond Metro during the evening, with rates of 1” per hour observed for a short time. While the pressure gradient on the back side of the low was not strong enough for winds to reach 35 mph (blizzard criteria), gusts to 20-25 mph were observed near the coast with visibilities of ¼ mile in the heavy snow. Fortunately, there were only isolated power outages as the snow was light and fluffy thanks to the Arctic airmass in place. Snow water ratios were close to 15:1 across most of the area, with lower ratios in NE NC. The snow finally ended between 9 PM and 2 AM. Totals were very impressive and ranged from 8-14” in Hampton Roads and NE NC, with 2-7” farther inland. Relatively lower totals (4-8”) were observed right along the Albemarle Sound where sleet mixed in with the snow at times. The 11.0” at ORF surpassed the total from the 1/3/2018 storm, and the 6.2” at the Wakefield NWS office was the highest since 1/3/2018! This will certainly be a storm to remember for those in Hampton Roads.

nws logo Media use of NWS Web News Stories is encouraged!
Please acknowledge the NWS as the source of any news information accessed from this site.
nws logo