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


wdrag
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11 minutes ago, Northof78 said:

For immediate coast or I-95 as well?

 

Looks like this run is  (10:1) 10 inches from NW - NJ to 18 inches SNJ - ELI.  NYC  EWR in the 10 - 14 range

Kuchera is 14 - 22 inches

 

image.thumb.png.934d6414de705727844d2cc24939013f.png

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2 minutes ago, SACRUS said:

 

Looks like this run is 10 inches from NW - NJ to 18 inches SNJ - ELI.  NYC  EWR in the 10 - 14 range

Looks like slightly more out this way in western Long Island.... from your description of the snowfall totals it sounds like the December 2009 snowstorm which had 10 inches at NYC and 15 inches at JFK with up to 24 inches on eastern Long Island.

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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.

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1 minute 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.

The good thing is it throws heavy snow pretty far to our west and ratios should be better

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4 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.

Could the low snow totals in SNE be from a few members inland in that area? 

IMG_4846.png

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2 minutes ago, Stormlover74 said:

No its because the low goes due east once it reaches Delaware's latitude so the heavy snow doesn't make it to new England. Speaking about the euro op

Sorry, I thought he was talking about the eps. What a odd thing to be concerned about off a op run 

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8 minutes ago, Allsnow said:

Could the low snow totals in SNE be from a few members inland in that area? 

 

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.

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6 minutes ago, Allsnow said:

Sorry, I thought he was talking about the eps. What a odd thing to be concerned about off a op run 

It's a definite risk with a pinwheeling ULL pushing into confluence. If the complex is shunted east before mid-level lows mature, the magnitude of event collapses pretty quickly.

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I don't have access to the individuals, but from the looks of it I'd estimate at least 25% of them would bring > 1.5" liquid to most of the area. Lots of high impact solutions there!... including several more intense than the operational.

But the caveat is that individual ensembles cluster around the parent operational run. So the true chance of >1.5" liquid from this storm is probably less than indicated by the EPS spread.

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