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11/7 Noreaster Thread


Rib

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Kind of hard to nail down a 4-8" spot, IMO. I'm not really expecting a solid band of 4-8" reports so much as spotty 4-8" totals somewhere in eastern PA and/or western NJ, depending on the final track. I debated on having a 4-8" contour on my own map but decided there's too much uncertainty still for a proper placement.

Someone will spike a foot out of this. Just not sure who.

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12z GFS = 12z Euro, basically. They're both very similar to yesterday's 12z runs.

What struck me as odd about the 12z GFS is it brought the freezing line further down into southern NJ (for 00z Thursday no less), making it cooler than the Euro for that area. Not sure if I should interpret that as right or wrong at this point, but it's an interesting footnote to compare with future runs to see how much the cooler surface temps penetrate to the south and east.

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What struck me as odd about the 12z GFS is it brought the freezing line further down into southern NJ (for 00z Thursday no less), making it cooler than the Euro for that area. Not sure if I should interpret that as right or wrong at this point, but it's an interesting footnote to compare with future runs to see how much the cooler surface temps penetrate to the south and east.

That had to be dynamic cooling, right? That was also coincidental with the highest snowfall.

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That had to be dynamic cooling, right? That was also coincidental with the highest snowfall.

I'm thinking that was a good part of it, but the GFS also brings the freezing line down to the MD/PA border where I-83 crosses and attaches it all, and I'm less confident in dynamic cooling being responsible in dragging the freezing line down that much in the lower precip rate areas.

Just so everyone can see what I'm talking about:

post-96-0-52145700-1352231716_thumb.png

post-96-0-92693300-1352231723_thumb.png

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I'm thinking that was a good part of it, but the GFS also brings the freezing line down to the MD/PA border where I-83 crosses and attaches it all, and I'm less confident in dynamic cooling being responsible in dragging the freezing line down that much in the lower precip rate areas.

You're right, I thought you were talking about S Jersey. That Central PA solution is closer to the Euro solution. I noticed that as it was coming in. Thermal profiles between the two models are much closer today than yesterday. Ambient airmass to the north?

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You're right, I thought you were talking about S Jersey. That Central PA solution is closer to the Euro solution. I noticed that as it was coming in. Thermal profiles between the two models are much closer today than yesterday. Ambient airmass to the north?

I threw southern NJ in there because it seems the GFS might be bringing some of that cooler air in to aid the dynamic cooling in getting the surface to/below freezing.

Looking at the MOS temperature error maps, it looks like the GFS and NAM were too warm for NC and just a hair over up this way. Not sure how much if any of that error will propagate north as time goes on. What I do like is the models are finally coming around to the cooler surface temps for the main event as they normally do when we're about this far out from the event, with the GFS being a bit more aggressive than the Euro. I think 32F in southern NJ for early evening might be pushing it a bit as far as cooling goes, but you never know.

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If 18z is all snow (its way colder than 12z) it would BURY Philly & most of NJ.

Mets you want to chime in...The models show precip really moving in like a wall. Meaning it could go from light to very heavy quickly (look at 18z NAM sim radar). It hits right before rush hour & it could make rush hour an absolute MESS if it verifies. Does that concern any of you on your forecasts?

JEEZ 18z NAM really sits the deform over us for extended period, lol

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I think the 18z nam is bout to do somethig stupid...

Hr21, light precip into snj...

You are some sorcerer. But seriously that looks like the Feb storm from 2 years ago. Just bombs out. Of course 18z nam precip totals are going to be a little high but still fun to look at.

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