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November 27th - 28th Snow Potential


Ice Warrior commander

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this is a lot of attention given to what will ultimately be flurries/sprinkles for most of this forum i think. maybe a period of steadier light precip scraping the immediate S coast? i can't see too much more than that happening.

Yep looks like the classic situation where we see a reasonably impressive precip shield continue to dissolve as it just skirts the south coast. Leaving most of us with some sprinkles/flurries.

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System just hits a brick wall.

It's still going to be really close. Precip lingers around eastern and coastal areas as the low gets going. We'll see, it's close enough to keep 1 eye on. Heck we're talking 20-40 miles for the .5" line as depicted on the NAM. It's not much of a shift N (or of course south) for this to be a bigger deal or no deal.

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NJ special on the nam

I'm not used to being in the spotlight with weather events but lately it has been all about NJ. The NAM clearly is stronger with the vort max and subsequent differential warm air/cyclonic advection than the global models. The GFS is laughable when looking at the vorticity fields in terms of us getting snow.

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If the NAM isn't out to lunch like it sometimes is and we see this type of gradient in the other models it's certainly something that justifies a closer watch in southern areas. Then again this is the NAM but it does appear to mirror the SREFs to some degree.

Here's the "final" QPF map for the event up here with just some lingering sprinkles/flurries at that point.

nam_namer_054_precip_p36.gif

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Agreed. The next two weeks probably a snoozer too.

I said this in the Philly forum but the failure of tomorrow's wave to be at least a normal "wave breaker" means our equation for pulling the NAO block west fails (it was an important part to the equation). So obviously the gradient shifts north but I also wouldn't call the next 2 weeks a snoozer either. It still is supportive of New England winter storm events but what a bust tomorrow's POS s/w is in terms of Atlantic aid.

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If the NAM isn't out to lunch like it sometimes is and we see this type of gradient in the other models it's certainly something that justifies a closer watch in southern areas. Then again this is the NAM but it does appear to mirror the SREFs to some degree.

Here's the "final" QPF map for the event up here with just some lingering sprinkles/flurries at that point.

nam_namer_054_precip_p36.gif

Theres going to be a band of steady snow from fronto forcing to the north of main shield. Rpm clearly shows it. If its right its 1-3 south of pike interior sne
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Theres going to be a band of steady snow from fronto forcing to the north of main shield. Rpm clearly shows it. If its right its 1-3 south of pike interior sne

I think D-2" is a good call for most of southern and central CT right now away from the immediate coast, actually. I want to see the Euro get a little juicer before going 1-3".

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If the NAM isn't out to lunch like it sometimes is and we see this type of gradient in the other models it's certainly something that justifies a closer watch in southern areas. Then again this is the NAM but it does appear to mirror the SREFs to some degree.

Here's the "final" QPF map for the event up here with just some lingering sprinkles/flurries at that point.

the NAM tries to close off low / mid-level circulations. as a result it has a much more favorable 900-700mb S flow which causes much better advection processes to get going. it then turns the flow E and NE which allows it to capture some Atlantic moisture.

obviously can't say for certain that it's wrong, but given the euro has almost no semblance of this happening, i think smart money would be on it not materializing that way.

the NAM has a tendency to do this at times...you see these overdone jets develop.

and given it's not a particularly nasty vortmax embedded in the flow, i'm not sure this is a good case to lean on the NAM.

we'll see i guess. i'd take anything at this point.

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I said this in the Philly forum but the failure of tomorrow's wave to be at least a normal "wave breaker" means our equation for pulling the NAO block west fails (it was an important part to the equation). So obviously the gradient shifts north but I also wouldn't call the next 2 weeks a snoozer either. It still is supportive of New England winter storm events but what a bust tomorrow's POS s/w is in terms of Atlantic aid.

I think the Pacific area started looking more hostile too which made me sort of meh starting earlier last week...even with a stronger -NAO. I agree it looked colder, but you could already see the writing on the wall with the gradient so close and rather mild thicknesses.

I think the next couple of weeks aren't particularly interesting, but maybe something sneaks in after the 6th or 7th. I think it may not be until after the 10th for anything really meaningful in terms of a more sustained change in the regime..hence my two weeks call, but maybe in about 10 days if we are lucky.

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the NAM tries to close off low / mid-level circulations. as a result it has a much more favorable 900-700mb S flow which causes much better advection processes to get going. it then turns the flow E and NE which allows it to capture some Atlantic moisture.

obviously can't say for certain that it's wrong, but given the euro has almost no semblance of this happening, i think smart money would be on it not materializing that way.

the NAM has a tendency to do this at times...you see these overdone jets develop.

and given it's not a particularly nasty vortmax embedded in the flow, i'm not sure this is a good case to lean on the NAM.

we'll see i guess. i'd take anything at this point.

I'm not a big believer in the SREFs but they did lend some support to the idea. That said, until the Euro comes around or at least the GFS and Euro come closer I'm with you that this is NBD. Still it'd be fun to see a NAM solution play out to compensate for the next 10+ of watching flocks of ducks on the nexrad.

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the NAM tries to close off low / mid-level circulations. as a result it has a much more favorable 900-700mb S flow which causes much better advection processes to get going. it then turns the flow E and NE which allows it to capture some Atlantic moisture.

obviously can't say for certain that it's wrong, but given the euro has almost no semblance of this happening, i think smart money would be on it not materializing that way.

the NAM has a tendency to do this at times...you see these overdone jets develop.

and given it's not a particularly nasty vortmax embedded in the flow, i'm not sure this is a good case to lean on the NAM.

we'll see i guess. i'd take anything at this point.

here are the two NAM vs EURO valid same time tue afternoon...euro on the left. pretty big difference:

post-218-0-82013100-1353941367_thumb.gif

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I'm not a big believer in the SREFs but they did lend some support to the idea. That said, until the Euro comes around or at least the GFS and Euro come closer I'm with you that this is NBD. Still it'd be fun to see a NAM solution play out to compensate for the next 10+ of watching flocks of ducks on the nexrad.

Yeah, agreed. Why not? Model watching is better than nothing lol

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The NAM is pretty much two warm for snow in the areas that get half-decent QPF in SNE with the exception of parts of CT in the interior that are like 34F...and then when the inverted trough sets up for E MA/SE MA, near BOS and perhaps interior SE MA is cool enough for a period of snow. Back my direction its mostly just flurries...maybe a brief period of light snow.

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