Friday December 13 2019

It is Friday the 13th and fresh off a Ravens victory in Baltimore. The good news is that the radar has been quiet as of 6 AM, and the risk of any ice will be confined well west in the hills and mountains.  There will be some heavy rain tonight into Saturday, then another event starting with snow and ice on Monday. First, let’s deal with the risk of icing in the Winter Weather Advisory Zone.

Ice Onset Timing

This graphic from The National Weather Service highlights the start time for any freezing rain or icing.   There may be some drizzle that is not shown on radar, so I would still be cautious in western Montgomery, Howard, and Carroll Counties, in Maryland until 9 or 10 AM

 

Winter Weather Advisory 

This goes through 3 PM in Maryland. The initial icing may be a four hours of a light glaze the could include parts of Carroll and Frederick County. But mostly along the I-81 corridor and westward through the afternoon.

 

Morning Temperatures

 

Ice and Rain Simulation Timeline –> slider

 

Temperature (Thawing) Trend

Late Morning

 

Noon

Evening

 

Thursday December 12, 2019 in Baltimore

Average High:  46ºF

Record High: 72ºF in 2015

Average  Low: 29ºF

Record Low:  8ºF in 1960

                      *Record Snow 7.6″ in 1966

Sunrise: 7:17 AM

Sunset 4:43 PM  

*Daylight = 0:33 shorter than yesterday 

*Bay Water Temperature = 44ºF at Thomas Pt. Light House (last year was 40ºF)

 

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Morning Weather Map

 

 

Storm Animation Friday – Monday

Heavy rain tonight and Saturday. A closer look at the Monday snow and icy mix is below.

 

 

Rain Forecast Through Saturday

 

Monday Mix of Snow Ice And Rain

Note that this timeline is subject to change as model error have shown systems arriving faster and farther north

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