A wave of low pressure will eject out of the Midwest Sunday afternoon, quickly moving east across the Mid-Atlantic states on Sunday night. A period of rain and snow is likely on Sunday night with some snow accumulations likely on grassy surfaces north and west of downtown DC.
Animation from the latest run of the European Forecast Model:
Heavy Snow is finally breaking out across the metropolitan Washington Area. My favorite forecast model (the European) lowered its accumulation output during the overnight run. Regardless, Winter Storm Warning criteria (5″ or more) is likely across the Metropolitan area today with snow… heavy at times, continuing through the afternoon before tapering off and ending later this evening.
The images below show the short-range high-resolution rapid refresh (HRRR) American models for how today may play out. Heaviest snow is indicated by the darkest shades of blue (time stamp is located on top-right hand corner of image):
Image below shows the latest High Resolution Rapid Refresh (HRRR) model simulating the future radar through 1 pm Wednesday.
– Notice the very heavy snow banding developing right across the interstate 95 corridor!
Snow will pick up in intensity during the morning hours on Wednesday:
-Visibility will be reduced under a quarter of a mile as the Nor’easter rapidly deepens off of the Mid-Atlantic coastline.
-A deformation zone will likely develop right across the interstate 95 corridor allowing for enhanced lift as the atmosphere stretches. This enhanced lift in the atmosphere will cause snowfall rates to increase to one to two inches per hour along with rapidly deteriorating conditions on area roadways.