Timing Tonight’s Wet Snow

 

The latest High Resolution Rapid Refresh (HRRR) model showing rain changing over to snow late tonight. Image courtesy, WxBell

 

Steady rain will continue to fall across the Washington Metropolitan Area tonight, gradually mixing with and changing over to snow from north to south.  

A period of moderate snow is likely after 3AM across northern Maryland and around 4/5 AM along the Interstate 66 corridor in northern Virginia, DC and route 50 in Maryland.  

A slushy accumulation of less than an inch is possible on grassy surfaces.

 


From Hail to Heavy Snow: It’s Gonna Be a Fun Evening & Overnight here in the Washington Area!

  • Will be watching locations from Richmond northward to Fredericksburg later this evening as a strong cold front crosses the area.  A line of thunderstorms may produce hail across these areas late this afternoon into the evening hours.

 

  • After the cold front slides through Washington a very impressive Vorticity Max (incredible lift and positive/counter-clockwise spin) in the atmosphere will be diving southward across the Washington Area as a surface low is now forecast to rapidly develop off of the Virginia/NC coast.  Cold air aloft will be pulled down toward the surface overnight as steady rain mixes with and then changes over to moderate snow.  

 

  • The snow could fall heavily at times Sunday morning between 4AM and 9AM.  I would not be surprised if someone reports a flash of lightning and thunder as this upper level feature rolls across our region pre-dawn Sunday.

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