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Discussion-OBS snow event sometime between 06z Thu 2/20-12z Fri 2/21?


wdrag
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36 minutes ago, eduggs said:

The low totals from the 12z ECM operational run are due to the SLP not gaining latitude. An ULL (offshoot of PV) forms off the coast and oozes eastward as the system stacks, pulling the whole system eastward. Great position for us, but not great for places further northeast.

Many of the EPS individuals gain more latitude and would be great up and down the coast. But a slide east either with a modest event or a complete miss are still very possible.

Great position for us because it makes it snow longer.  The great storms we all remember usually did not make it north of ACY in terms of the SLP.

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55 minutes ago, eduggs said:

The 12z ECM is obviously great, but we gotta watch that eastward slide at the end. The relatively low snow totals in SNE are a small red flag. I'd prefer this to tuck into RI and stall then to slide east so quickly. We're good for now but if the eastward pull happens earlier we get the SNE modeled snow.

Then again other guidance (e.g., UK, CMC) hammers SNE.

we dont actually want this to get to that latitude, if you look at maps of our previous widespread 20 inch plus events (February 1983, January 1996, PD2 2003 and January 2016) they go due east once they reach the latitude of Delaware or southern NJ, it makes the snowfall of longer duration for us.

 

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1 minute ago, LibertyBell said:

we dont actually want this to get to that latitude, if you look at maps of our previous widespread 20 inch plus events (February 1983, January 1996, PD2 2003 and January 2016) they go due east once they reach the latitude of Delaware or southern NJ, it makes the snowfall of longer duration for us.

 

storms like boxing day, 1978, and march 1888 made a left hook near li

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28 minutes ago, qg_omega said:

Classic Euro bias is too close to the coast in these setups, would NOT toss the GFS.

Do you have any recent examples where most of the globals were focused on fairly similar results simultaneously, yet the "EURO'S tucked bias" you mention was shown to be present?

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37 minutes ago, qg_omega said:

Classic Euro bias is too close to the coast in these setups, would NOT toss the GFS.

Does the UKMET and CMC have a "too close to the coast bias" in these setups? They're basically in the same spot as the Euro.
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10 minutes ago, dseagull said:

Do you have any recent examples where most of the globals were focused on fairly similar results simultaneously, yet the "EURO'S tucked bias" you mention was shown to be present?

The January 26-27 2015 bust is a good example of that, the Euro showed an extremely tucked solution and like 40 inches of snow and the GFS was far more progressive (and right). 

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Just now, mob1 said:

The January 26-27 2015 bust is a good example of that, the Euro showed an extremely tucked solution and like 40 inches of snow and the GFS was far more progressive (and right). 

there are far more examples going the other way though, most notably January 1996 which the GFS/AVN had offshore and the Euro/NAM/ETA had hitting us from a week out.

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3 minutes ago, mob1 said:

The January 26-27 2015 bust is a good example of that, the Euro showed an extremely tucked solution and like 40 inches of snow and the GFS was far more progressive (and right). 

Appreciate it.  Looking into updates versus large bias failures for the fun of it. 

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3 minutes ago, mob1 said:

The January 26-27 2015 bust is a good example of that, the Euro showed an extremely tucked solution and like 40 inches of snow and the GFS was far more progressive (and right). 

+nao with that storm though

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1 minute ago, dseagull said:

Appreciate it.  Looking into updates versus large bias failures for the fun of it. 

I think in general at this range the Euro tends to be far more amplified with most storms than the GFS. In terms of it being a well-known bias, I think maybe only recently as the Euro used to have incredible verification scores back in the day in the mid range. 

 

They tinkered with it a little and now it definitely is a bit more overzealous in the 4-7 day range, whereas the GFS is the opposite extreme. Doesn't mean either one is right/wrong this time, but I don't think the notion should be completely discounted.  

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44 minutes ago, LibertyBell said:

we dont actually want this to get to that latitude, if you look at maps of our previous widespread 20 inch plus events (February 1983, January 1996, PD2 2003 and January 2016) they go due east once they reach the latitude of Delaware or southern NJ, it makes the snowfall of longer duration for us.

 

As modeled on the 12z ECM, this is a 12-18hr event, depending on location across our area. Several of the individual members that gain more latitude also provide a longer duration event because we spend more time in the CCB as it pivots over our area.

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23 minutes ago, LibertyBell said:

there are far more examples going the other way though, most notably January 1996 which the GFS/AVN had offshore and the Euro/NAM/ETA had hitting us from a week out.

Didn't the euro have the boxing day storm a week out and never lost it?  I remember getting blizzard warnings 2 days early.

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I think you discount the GFS slightly here because of the other guidance, but definitely not entirely. The GFS shows that if some aspect of this evolution is not favorable, the whole thing could fall apart. A miss southeast is still very much on the table.

I'll be looking for run to run consistency from the other models in upcoming cycles; minimizing the variability will increase confidence. And of course any improvement in the GFS will be welcomed. But there could easily be occasional misses across guidance for the next few days. It is almost always like that at this range in advance of major storms.

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20 minutes ago, eduggs said:

As modeled on the 12z ECM, this is a 12-18hr event, depending on location across our area. Several of the individual members that gain more latitude also provide a longer duration event because we spend more time in the CCB as it pivots over our area.

The reason why the key to an HECS is to keep the SLP south of our latitude is that once north and east of here the wind backs around to the NW and that quickly terminates any and all snowfall (at least for here, NW is a very dry downsloping wind and the sun quickly comes out.) You want the wind to be NE as long as possible to maximize snowfall duration and that means the SLP has to stay south and east of us.

Long duration snowfall isn't 12-18 hours, that's medium length, long duration is 24+ hours.

 

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1 hour ago, LibertyBell said:

this map reads 16 for the city and 20-24 for us here SW LI

5 days out so it doesn't matter that much

I would just hate another bomb cyclone that hits the NJ coast, skirts C and NNJ and delivers to western LI. Seen way too many of those: I'm sitting on 6 inches and AC has and LI has the same....not that 6 inches is bad....

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Just now, LibertyBell said:

The reason why the key to an HECS is to keep the SLP south of our latitude is that once north and east of here the wind backs around to the NW and that terminates any and all snowfall (at least for here, NW is a very dry downsloping wind and the sun quickly comes out.)

 

Supposedly it was that NW wind that killed us in Feb 89...

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