National Weather Service United States Department of Commerce

Overview

Strong low pressure began to develop off the coast of North Carolina during the morning of February 22 as a leading upper shortwave tracked over the local area. While temperatures above 3000 feet were below freezing, the lowest levels were still above freezing. Therefore, precipitation started as rain area wide with temperatures in the upper 30s. Weak CAA was ongoing throughout the day, though daytime heating and the late February sun angle likely kept the lowest levels just warm enough for the precipitation to remain rain for much of the morning into the early afternoon. A strong, negatively tilted shortwave and associated upper low approached later in the day and tracked over the area during the evening through early morning on 2/23. This caused the low to rapidly deepen as it tracked NE off the Mid-Atlantic coast. Precipitation gradually increased in intensity during the afternoon, and precipitation began to change to snow over the Maryland Eastern Shore by mid afternoon as surface temperatures dropped to 32-33F. Elsewhere precipitation remained as rain until the late afternoon-early evening with the loss of daytime heating and increasing CAA with winds becoming N then NW. While it snowed for 2-6 hours during the evening in areas west of the Chesapeake Bay with surface temperatures of 32-33F, the warm ground and marginal surface temperatures resulted in extremely inefficient accumulation rates (and even initially on the eastern shore). The snow ended west of the bay by 8-11 PM. 2-4.5" fell across the northern neck. 1-2" of snow fell in Hampton Roads where heavy rates allowed for a quick accumulation even on the roads. However, only a trace to 1" was observed in the Richmond Metro area where snow rates couldn't overcome the warm ground. For example, the Richmond airport reported 0.25" of precipitation after the changeover to snow but only a trace of accumulation. Visibilities there never got below 1 mile, which directly correlate to snowfall rates. 

It was a completely different story on the eastern shore (except for Northampton County which only saw 3-4" of snow). While the snow struggled to accumulate much before sunset, conditions rapidly deteriorated during the night of 2/22 into the early morning of 2/23 as the NW winds increased to 20-35 mph with gusts to 40-55 mph with snow rates averaging 1"/hour between 6 PM and 3 AM. Rates peaked in the 2-3"/hour range briefly. Brief blizzard conditions were observed and temperatures dropped to 30-31F, allowing for much more efficient snow accumulation. 8-14" of mostly heavy, wet snow fell from northern Accomack County to the Lower Maryland Eastern Shore. The heavy, wet snow stuck to all surfaces. The weight of the snow combined with the wind resulted in 20-40% of Wicomico, Somerset, and Worcester Counties to lose power during the storm. Despite temperatures just below freezing, the last inch or two of snow was light and fluffy with rapidly cooling mid level temperatures on the back side of the deepening low. Coastal flood impacts were very limited given winds becoming NW to WNW as the low deepened offshore. Coastal flood impacts likely would have been much greater if the low had deepened to ~980mb just 50-100 miles farther south.

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