January 16 2018

The Winter Weather Advisory has been expanded to include metro Baltimore and Washington into southern Maryland through 9 AM Wednesday January 17. This follows my forecast for around 1 inch of snow in these areas as seen in my final Snowcast map below. While this is a light snow event, it will impact most of our region overnight and likely lead to school delays Wednesday morning.

Added in this Advisory are these counties:

District of Columbia-Southern Baltimore-Prince Georges-Anne Arundel-Charles-Northwest Montgomery-Central and Southeast Montgomery-Northwest Howard-Central and Southeast Howard-Southeast Harford-Prince William/Manassas/Manassas Park-Fairfax-Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-Northern Fauquier-Southern Fauquier-Western Loudoun-Eastern Loudoun-

Highlights:

Most of the day we will see snow on the radar near Hagerstown and along I-81. Then watch the slow progress eastward after dark so that the western and norther suburbs will get the snow this evening, but metro areas my not until after midnight.
Flurries may break out long before the radar can show it. We already have a low cloud deck and some elevation fog, so there is plenty of moisture available and waiting for the trigger from the front to put it to work.
Arctic air will follow. So the ground will be icy and snow will be light and blow around easy Wednesday morning.

Below is the latest snow timeline and my updated Snowcast map below. I apologize for the color code being misleading in my prior report. That has been fixed.

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It is important to note that there may be flurries and light snow breaking out later today and this evening that the radar will have trouble showing. Your reporting and crowdsourcing will help us pin that down as even the modeling here is having some issues with the leading edge.

—-> slider: This Evening

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—-> slider: Wednesday Midnight-Morning

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My Snowcast Ending Wednesday Morning

While I still see a general 1 to 3 inches in our area, there will be slight more to the north and perhaps a surge of snow west and south of Washington. Metro areas will get close to 1 inch with the higher range in the colder western and northern suburbs.

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