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NYC/PHL: January 25-27 Potential Bomb Part 4


earthlight

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Its the trends to look at right....Not take every model run verbatum....which, it seems too many people are doing.Colder, slower....and if this continues probably snowier as the days are going by. Now I'm not just saying that because I live on the coast either, when I saw rain I said rain....just want to clear that up also...

Absolutely and more changes are still likely. Anything is still possible but the trend has become much more favorable for eastern regions.

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By the way...Euro has a huge snowstorm impacting the Mid Atlantic at 240 hours with a nice signal and a surface low off the GA coast..about to impact the entire area with snow.

There is still lots of uncertainty with the first storm, so let's deal with that first before chatting up the next threat.

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No, honestly, that is the way it looks to me. If you want to average it out you could just say the whole state is 1.75. That would be pretty close for everyone in DE.

Are you messing with me?

our state is about 25 miles west to east in the North and maybe 60 in the southern most portion?

Maybe you meant North to South?

:unsure:

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NOTE: This is dtk's post in the locked thread... thought I would move it over here so all could see and in case it gets lost in the now locked thread

Just something to keep in mind, recently the GFS has had a SLIGHT near-surface cold bias while the Euro has definitely run a bit warm. These are hemispheric examples, but demonstrate the point [the black is GFS and red ECMWF....this is the average temperature bias as a function of forecast lead time for the past month or so....each system verified against its own analysis.....this is 1000 mb, so you have to be careful about interpretation):

biasdieoff_T_P1000_G2NHX_00Z.png

Here is more evidence, but actually implies the GFS has a slight WARM near surface bias at 48 hours. The plot below are the mean fits of temperatures forecasts to RAOBS over NA for 2 day forecasts for the past month (GFS black, ECM red). The dashed line is the bias (solid RMSE)....notice the substantial warm bias between 1000 and 800 on the ECMWF.....

tt.f48.na.adp.gif

I'm not saying this translates to anything specific for this forecast, just something to bear in mind.

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Middle ground between euro and gfs probably the safe bet right now, something more like the gefs 12z and euro ensembles from 00z pending 12z.

I think that for areas just west of 95, lets say from 20 miles or so, to about the catskills, poconos and into interior SNE are going to get absolutely plastered by a heavy wet snow which could cause a lot of problems. This area of high impact could easily shift west or more likely east over the next couple days but I definitely see this as being a very high impact storm...

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Honestly, if you just take an average of all the global models at this point you end up with something close to the EC. You have the Canadian way inland to the UKMET out to sea, to the GFS and NOGAPS brushing the coast. The average is very close to what the ECMWF portrays.

you got a good point. should be interesting to see what the gfs and nam portrays in the 0z runs. the 12z was considerably west of the 00z. trend? we shall see

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yes is goes directly ENE from there to 96 so unless this storm goes directly north than makes a hard right (which obv is not what happens), this solution is among the eastern edge of the guidance.

At 96 hrs it ends up east of Cape Cod

It may be slightly east of the ECM at that time but it is definitely not out to sea...

An out to sea scenario does not bring precipitation into the region...

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At 96 hrs it ends up east of Cape Cod

It may be slightly east of the ECM at that time but it is definitely not out to sea...

An out to sea scenario does not bring precipitation into the region...

might be east? at hr 96 it is over 200miles east of CC...the euro while NE of CC gained a lot more latitude then the UK ever did...

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might be east? at hr 96 it is over 200miles east of CC...the euro while NE of CC gained a lot more latitude then the UK ever did...

He said at that time (hr 84). It isn't very far east at that time. It does seem that post-84-hours seems to be the point where the models deviate the tracks the most. Some kicking it OTS, others keeping it tucked in closer for another hundred miles.

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faster and less amplified, meaning further east?

All I have are the H5 spag charts, but that would be my educated guess. It won't be a lot farther east and I think more than anything confirms the suspicions that a 30 hr snowstorm with no block is unlikely.

EDIT: Actually, the low track on the mean isn't all that different (probably because the deeper solutions will be farther west)

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