Winter Weather Advisory Monday December 16 Morning Snow Late Day Ice

Sunday December 15 2019

A Winter Weather Advisory has been issued for the northern and western half of the region for Monday morning. This goes along classic lines father inland away form the big cities and warming from the Chesapeake Bay. We will all get snow, and it arrives early. But the places likely to have temperatures below freezing and impact on the roads are in the shaded counties below.

Winter Weather Advisory

Two Parts: Morning Snow, Late Day and Evening Ice

There are two model simulations sliders below. The show the early arrival of snow, then a lull. Northern areas are likely to remain near or below freezing while the second wave

School Impact?

I don’t make the school call, but if I was a betting man I would suggest this:  It will be snowing when the call is made.  It’s after a weekend and the last week before holiday break. If there is ever a time to be lenient on expecting icy roads and delaying school, this would be it in the counties with a Winter Weather Advisory.

A delay is what to aim for first, then maybe reevaluation. The northern Maryland and southern Pennsylvania advisory zones should get in on freezing rain later in the day. The impact on roads are likely as it gets dark after 4:30 PM. Evening activities might be canceled there.

However, this does not apply to all areas.  In Maryland the school decisions are county wide. The advisories below highlight the split in counties such as:

• Western Montgomery and Howard, plus northern Baltimore and Harford Counties: It is possible you have wet roads by you, but other parts of your county are slick. This could be one of those days.
• Southern PA: will be in the thick of the frozen zone with snow in the morning and ice later in the day.
• Baltimore City, Anne Arundel, Cecil County and back to Prince Georges are on the edge of 50% chance of roads getting some stickage before daybreak. But likely staying wet closer to the water.

Compare To My Original Call

The NWS Advisory does allow for 1 to 3 inches of snow

I’ve fixed the icing to include ‘Through Evening‘.

Evening Set Up

Morning Snow

HRRR Model —> slider

This model brings in the snow even earlier. It could begin between 1 AM and 3 AM

I will be up in the morning to start updates after 4 AM

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