Friday, December 20, 2024
Afternoon Report
The best way to describe the weather today: Cyclogenesis. One clipper racing across the Ohio Valley is sending energy to a new storm forming off the coast. That new storm will be moving out of reach, but is close enough for us to be in the transition zone and get this band so snow (and rain) to develop in between.
The snow inland today was expected, as I wrote for the last two days… I didn’t play it up much beyond what may fall since it looked like much may not stick. We do have this reaching full potential and then some as we head into the weekend. But as the air gets colder into the dark hours and one more push of snow clips parts of the area, I expect we might gave some travel issues into Saturday morning.
This weekend will turn very cold, and it looks like the temps will be colder through the Christmas holiday.
Let’s take a fresh, updated look:
Just show the marginal air with freezing. It will trend colder after dark in the snow areas… so icing is possible, with minor stickage when more snow falls.
This is just to show the extrapolation of the snow vs rain…
The ‘Hereford Zone’ of Baltimore County is displaying that elevation for the delegation of colder air and snow North and West.
The old fading Clipper is in Eastern Ohio. This is part of the energy transfer to the developing Coastal Low. That storm will influence the weather tonight with additional snow but will move out of reach by morning.
The snow across north Central Maryland through Pennsylvania is part of that energy transfer.
The primary energy at the Jet Stream level (18,000 Ft) located in Kentucky, behind the surface Low…. Strong winds will zip this to the coast by morning.
That energy will reach the Coastal Low well off the shoreline.
The energy will be east of New England, while some additional vort maxes may swing through Central PA with some snow showers and definitely strong gusty winds.
Here is the reflection of the storm racing out on Saturday as the cold air fills in behind.
Watch the regeneration of snow in Pennsylvania that drops southeast overnight. This will affect metro Philadelphia and might drop a coating or more across Northern Delmarva.
Snow across South Central PA to metro Philadelphia and Maryland’s Eastern Shore.
The freezing line may reach the areas that have had snow first during the day today. Where the ground is wet, I recommend dropping salt.
The last burst of snow across metro Philadelphia may include Cecil County, Maryland, and Delaware between Wilmington and Dover.
It will be cold for the Ravens Game in Baltimore!
The coldest of this stretch…
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A weak cold front may tap into the colder air and produce a light wintry mix on Christmas Eve in the morning.
This suggestion for Tuesday morning is subject to change. The trend has been colder and wetter… or slicker.
I will leave the potential for Wintry Mix for now… and know that the air that follows for Christmas is looking cold as well.
The cold is looking to hold.
This weekend will feel like winter, with temps staying below freezing.
Flurries might reach us on Christmas Eve, and then we stay cold into Christmas—not the warm-up it looked like earlier.
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I am aware there are some spelling and grammar typos and occasional other glitches. I take responsibility for my mistakes and even the computer glitches I may miss. I have made a few public statements over the years, but if you are new here, you may have missed it: I have dyslexia and found out during my second year at Cornell University. It didn’t stop me from getting my meteorology degree and being the first to get the AMS CBM in the Baltimore/Washington region. One of my professors told me that I had made it that far without knowing and to not let it be a crutch going forward. That was Mark Wysocki, and he was absolutely correct! I do miss my mistakes in my own proofreading. The autocorrect spell check on my computer sometimes does an injustice to make it worse. I also can make mistakes in forecasting. No one is perfect at predicting the future. All of the maps and information are accurate. The ‘wordy’ stuff can get sticky. There has been no editor who can check my work while writing and to have it ready to send out in a newsworthy timeline. Barbara Werner is a member of the web team that helps me maintain this site. She has taken it upon herself to edit typos when she is available. That could be AFTER you read this. I accept this and perhaps proves what you read is really from me… It’s part of my charm. #FITF
