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Possible April Snowstorm (4/9) & Observations


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Dr. No strikes again...looks like the other foreign guidance more south.

 

 

It came well north and matches every model with the placement of the band. It's actually further north then a couple of the models.

NYC is in the middle of banding on the euro.

Euro just has less precip because it usually struggles with events that involve convection and synoptics.

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It came well north and matches every model with the placement of the band. It's actually further north then a couple of the models.

NYC is in the middle of banding on the euro.

Euro just has less precip because it usually struggles with events that involve convection and synoptics.

 

Here's to hoping the GFS and NAM are right against all the other models which are more south to some extent.

 

Convection and p-TYPES  make this a high bust potential forecast either way with a small shift north to the

more southern guidance or south on the American in later runs. Accumulations will be based on where

the band sets up since light precip won't cool the column enough.

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It came well north and matches every model with the placement of the band. It's actually further north then a couple of the models.

NYC is in the middle of banding on the euro.

Euro just has less precip because it usually struggles with events that involve convection and synoptics.

Do we know if this banding that the Euro is showing over the area is snow on this run? I would assume since it's not as heavy on the Euro that it's showing more of a mix.

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Do we know if this banding that the Euro is showing over the area is snow on this run? I would assume since it's not as heavy on the Euro that it's showing more of a mix.

Probably a mix or non-accumulating snow on the euro.

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This is the type of system where small errors can have a large impact. Right now, there remains a possibility of measurable snow in the New York City area, but it appears that the probability of such snowfall is higher from Newark and southward. The NAM has had poor run-to-run continuity, which highlights the amount of uncertainty.

 

The most recent SREF plumes for LGA had an increase in expected mean snowfall from the 9z run. The 15z mean snowfall figure was 1.6" vs. 1.2" at 9z. However, the percentage of SREF members showing measurable snowfall decreased from 59% on the 9z run to 52% on the 15z run. There was an increase in the percentage of plumes showing 1" or more (37% vs. 26%). Finally, reflecting what may be an increase in uncertainty despite the shrinking forecast horizon, the 95% confidence range continued to widen. 

 

In sum, even as we're less than 24 hours from the event, the idea that NYC will see measurable snowfall remains a fairly low confidence proposition. If the SREF plumes are reasonably representative, it's almost a coin toss so to speak.

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