Dec 29: Final Call Snow Map for Saturday (Tomorrow)

Jonathan Carr
By Jonathan Carr December 29, 2017 17:21

Dec 29: Final Call Snow Map for Saturday (Tomorrow)

snowmap12-29-2017full

Click here for full-resolution snow map!

Discussion: No real changes to last night’s forecast. Snowfall is currently approaching the Ohio Valley region. This should spread through PA and N MD overnight before exiting across NJ tomorrow. Timing is between dusk and dawn tomorrow for NJ from the W to E moving shield of precipitation. End-game accumulations are on the lighter side as the above map suggests.

The current temperature profile however will allow for high-ratio snowfall that should stick to all surfaces. It only takes a half-inch of this fluffy kind of stuff to make untreated roads slippery. This should be the kind of snow that’s swept away with a broom. For most.

There is one wildcard area that’s worth mentioning (yellow area). A weak surface low is expected to form somewhere in the Delmarva/SNJ area tomorrow as remaining northern energy pulls away. This is expected to enhance a few departing snow bands. These bands could set up over SENJ or just offshore. Should the former occur then you could probably add an inch or two to the widespread C-1/2″ expectation. Areas SE of the I-95 corridor/NJTP would be favored with immediate coastal regions (yellow area) the most favored for such. My gut feel is about a 20-30% chance of this happening…therefore I feel that a 70-80% chance exists of just the widespread coating to an inch or two. This will have to be now-casted as it happens.

In English: A very light and fluffy snowfall is on the way. Snowfall should begin by daybreak tomorrow and end by late-afternoon. Only a coating to an inch or two is expected so nothing too disruptive. A small wildcard chance exists that SENJ counties could see a little more due to coastal enhancement. Otherwise this isn’t a big deal. Please use a little extra caution on any untreated snow-covered roadways tomorrow. The above map represents our most reasonable evidence-based expectation heading into this light event. Live observations from this point on. Have a great night and please be safe! JC

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Jonathan Carr
By Jonathan Carr December 29, 2017 17:21

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