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February 4th-6th Overunning & Possible Coastal Threat


IsentropicLift

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I agree but it's because we end up with an ice storm which is the worst outcome in my opinion.

When it comes to freezing rain. The temp needs to really be 30 and below to really accumulate in the city. Especially if it's heavy rain.

Anyone know the temps for KMMU and NYC during the peak icing?

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I would urge everyone to not pay attention to the finer details and focus on the improvements with the other features. This was not that far off from a much better solution. The evolution of the system was slower and therefore the WAA precip didn't arrive fast enough to be snow in the city. That will also need to be watched. The earlier on Tuesday that this starts, the colder aloft it will be.

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This doesn't show 1 flake of snow for most of nj and NYC....worst gfs run yet....

I'm still not throwing in the towel by any means yet but I'd really like to see within the next 24-48 hours some solutions at least start redeveloping the low substantially further south than progged now. I'm not liking the continuing trend toward a more consolidated and amplified trough coming from the Midwest. That will leave us with very little room to work with for snow before a changeover. SWFE events just are not favorable for us for a lot of snow, other than the outlier cases such as 2/22/2008.

 

I like the odds of at least one of the three upcoming events delivering a significant event for the entire area, but I can also see them all being a combination of whiffs and cutters. That's the risk you run in a progressive pattern with little blocking. Hopefully we continue the trend toward more west based blocking, because otherwise these events will all be nailbiters with a real chance they are all duds.

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At  KNYC at 132 its plus 6 at 850 and the surface is close to 30 Degrees , that's  def ugly

wow that's impressive that the GFS is able to pick up on low level surface cold down to the coast! rarely have I seen it portray surface temperatures accurately in this kind of situation, that's where mesoscale models like the NAM are actually useful. could this be a rare coastal plain icestorm? 

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I would urge everyone to not pay attention to the finer details and focus on the improvements with the other features. This was not that far off from a much better solution. The evolution of the system was slower and therefore the WAA precip didn't arrive fast enough to be snow in the city. That will also need to be watched. The earlier on Tuesday that this starts, the colder aloft it will be.

We want this to come in faster, that way it has less chance to amplify too much and has a better chance to catch a stronger PV before it retreats. If it slows down and amplifies, we are in trouble.

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wow that's impressive that the GFS is able to pick up on low level surface cold down to the coast! rarely have I seen it portray surface temperatures accurately in this kind of situation, that's where mesoscale models like the NAM are actually useful. could this be a rare coastal plain icestorm? 

 

The high is in a really good location as the storm comes in and its also expansive running back all the way across Canada, you can see the CAD signature evident even when the low is practically over PA.

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It's colder and the low transfers further south than previous runs. Big improvement on this run.

Remember, the 850 and 925mb lows also have to pass SE of us for there to be no changeover. If those lows pass NW of us, even with a surface low SE of us the primary will still be dominant and we will changeover. The coastal low has to take over much sooner, not just show up as a reflection on the coast while the primary is clearly stronger.

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Can you post the map by any chance?

It's 4-6" for most of NNJ. Less east, a tad more NW. The icing would then be some of the worst this area has seen in awhile.

 

Side note, the more of a front end dump we get the more it will help to lock in the low level cold air for when the ZR arrives.

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It's 4-6" for most of NNJ. Less east, a tad more NW. The icing would then be some of the worst this area has seen in awhile.

 

Side note, the more of a front end dump we get the more it will help to lock in the low level cold air for when the ZR arrives.

Interesting.  Could really be quite a mess, particularly outside of the urban heat of NYC, when you are talking about QPF of over 1 inch.

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