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January 20-22 “bring the mojo” winter storm threat


lilj4425
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1 minute ago, burgertime said:

NAM is really sticking to its guns on this one. It's really anyone's guess how this plays out. Will be a true nowcast situation. 

As good as the NAM and 3k are with temperatures, as you said, this is such a delicate situation that a degree or two changes everything.

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7 minutes ago, alhooks13 said:

How did forecasts end up being so wrong? The flawed predictions can be traced to computer model errors and the inability of human forecasters to adequately account for them.

When fronts come in from the north and west, models sometimes have a bias of drawing in cold air too quickly. Some of our biggest winter storm busts over the years have occurred when we’ve accepted model forecasts indicating temperatures would rapidly cool to near freezing with rain changing to snow.

In short, we probably should have been more skeptical of the models. But we gave them considerable credence since they had done a good job with the other events this month. Notably, they nailed the Jan. 3 snow forecast the day after it was 63 degrees.

Not to mention you have to factor in local effects whether it be tertiary or other considerations, model biases & weaknesses, model resolution issues with terrain influence and know just what items models are not programed to account for in the local/regional environment. Too many folks these days see the models as a tell all when they are just meant as a tool for professional interpretation. Lot more goes into it that the public doesn't realize. 

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2 minutes ago, snowinnc said:

Better than the NAM?

I still think it is better than the NAM 12k. The NAM 3k in this range may be better with temp profiles, whereas the RGEM - in my opinion - is better regarding precip placement and strength, as well as LP placement. 

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I'm not sold on anything that noticeable for Wake with tonight's first round.  Cold chasing moisture and it looks like limited moisture by the time temperatures get low enough for anything appreciable.

As for the main round tomorrow, it's going to be really close with how far west the main precipitation gets...  It is going to be painful for someone...  
I'm going 1-3" across Wake.

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