Late Afternoon GFS More Red Flags

Late Afternoon GFS More Red Flags

Late Afternoon GFS More Red Flags

The late afternoon GFS model hoisted more red flags. Though the model still shows a significant snowfall it is slowly going further south with the southern feature. The upper air map below is for Friday morning. Now the red flags of the afternoon are subtle but they are there. The problem lies in the northern jet stream indicated by the black arrow. That jet is important. You need to have a delicate balance in the atmosphere. The jet in the north needs to be strong enough to feed in cold air and at the same time it needs to be weak enough to allow the southern part of the jet stream to lift northward.

Late Afternoon GFS More Red Flags GFS Friday Morning

gfs66 Late Afternoon GFS More Red Flags

Here in lies the problem. As we have moved through time that jet stream is shown to be stronger which means it winds up being colder in the northeast. All the models show this. The European suggests that the northern jet will be even stronger than the GFS model indicates. Unless that northern jet is weaker than forecast the southern system is going to have a difficult time lifting to the northeast. It is certainly going to try but at some point it is going to take the path of least resistance. That path is more east than north.

Late Afternoon GFS More Red Flags European Friday Morning

euro72 Late Afternoon GFS More Red Flags

Late Afternoon GFS More Red Flags European Sunday Morning

euro96 Late Afternoon GFS More Red Flags

Now the GFS with its weaker northern jet allows for more room. But here too it is beginning to show that the European may have the better idea. The GFS is a little faster by about 6 hours but it has the upper feature north and west of the European model

Late Afternoon GFS More Red Flags GFS Sunday Morning

gfs108 Late Afternoon GFS More Red Flags

Even here the GFS model is further south east with its upper low position than it was earlier. It literally does produce sizeable snows for the immediate coast from Southeast New England and New York City with the greatest amounts south and east. However north and west of these areas the snow cuts off sharply.

gfssnow Late Afternoon GFS More Red Flags

I think if you want to be realistic, you can take the GFS amounts and cut them back by at least 1/3. Look below at the last 3 European snowfall forecast maps courtesy of Eurowx.com and you can see how the southern trend of the European has changed the snowfall forecast.EUROSNOW Late Afternoon GFS More Red Flags
EUROSNOW Late Afternoon GFS More Red Flags eurosnow1 Late Afternoon GFS More Red FlagsTonight’s run will be critical. First off I would look for the European southern trend to continue and the GFS and Canadian slowly coming into line. If the European moves northward for some reason than I would wait at least one more run for confirmation. I keep coming back to this past weekend with the ocean storm that backed westward at the last minute. Granted the situation is different in a lot of ways, however there have been several times in the last 6 weeks where this has happened. The European was the furthest east with the ocean system and the last one to back westward on Sunday. I don’t want to completely close the door on this yet. Obviously there is still plenty of time and the weather system involved is finally coming inland in the west. Let’s see what it does tonight and hopefully we will get some clarity one way or the other.

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