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December Medium/Long Range Discussion


yoda
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1 minute ago, NorthArlington101 said:

Also on AIFS ens.... please remember we seem to have pretty much decided it can't tell the difference between snow/IP/FRZA/etc - but I see this as the total amount of wintry precip it's seeing for Friday. Just gotta mentally convert it to a QPF map

1766815200-ZJE8H8YjmYA.png

buzzkill. Are you weather wills cousin?

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LWX mentions the  big south trend in their afternoon disco!!!

 

Meanwhile, another disturbance will emerge out of the West Coast

trough and rapidly track up over the central US ridge Thursday into

Thursday night, before diving east-southeastward toward the Mid-

Atlantic on Friday. Guidance has shifted significantly southward

with the track of this system with each of the last few model runs.

As a result, many solutions now show wintry precipitation across the

northern half of the forecast area (roughly I-66/US-50 northward).

Of the solutions that do have wintry precipitation, most favor

freezing rain and sleet, but some snow can`t be completely ruled out

depending on the ultimate track of the system. The upstream flow

pattern across the North Pacific (from which this system will

originate) is highly complex at the moment, with critical pieces

that will come together still to the west of the California coast,

in the Gulf of Alaska, and in the Bering Strait. Another closed

upper low to the west of Hawaii will likely also have a major impact

on how the West Coast trough evolves. As a result, there could still

be significant shifts with respect to the track of this system over

the next few model runs, and confidence in the forecast is much

lower than normal for five days out.

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