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Thanksgiving Weekend Weather (Wed-Sun)


ORH_wxman

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Time and time again model runs don't change. With three days to go time "locked".  Statements with absolutes are not believable. Three words, "as presently modelled" goes along way keeping the convo real. Been burnt to many times. 00Z could roll out as a 2 foot 18 hour blitz starting Thu afternoon. (just sayin) Critical time is soon, track, QPF and temp profiles become apparent thus a higher percentage of accurate forecasting.     

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My favorite is this recent trend: "Storm is staying east because there is no blocking" followed by "Storm is coming up the coast because there's no blocking" 

 

 

Its kind of a paradox at times...it all depends on how the storm is developing. Lack of blocking can caused a phased storm to just keep going to town and rip straight N...whereas a block would "force" it underneath.

 

But I think in an unphased situation, the lack of blocking and progressiveness helps it go more east...whereas a blocked flow would slow things down and allow a phase to occur. The problem is we don't really know if this is a good phase yet. :lol:

 

It's a really difficult forecast because of this. But it also creates a lot of the weenie'isms where you can use either argument to support which solution you want.

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"as presently modelled" ... I like that. Whenever you talk to folks (outside of the met/weather enth. circle) about a potential snowstorm, the first question you get asked is "How much?" Even if its 5 or 6 or 7 days out. I don't think people realize how much variance there can be hour to hour, day to day as the storm draws near.

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If this passes just E of or over the Cape I can see a place like Greenfield thumping out a solid  4-6" followed by a few hours of freezing drizzle.  Seen that scenario plenty around here.  MPM and the higher hills get 6-8" with a little taint. 

Confident that plowable snow is on the way for NW MA.  I'm also confident that it will be heavy snow to move.

Looks like a very quick hitter too.  8 hours of precip?

Winter comin' early.

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I have learned from experience that a perfect track 11/26 still is a long shot for snow around mby. To get decent snow I need a weak but juicy system running out under me ala 11/29/95. The day before that system was very warm btw-60s.

You just need a good airmass. It's not cold enough aloft and we are getting strong WAA as the precip occurs. Not the best recipe for you and I.

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Guess we will have to wait and see. There seems to be a considerable difference between a track E of ACK, one over the Cape, one over Boston, etc. 

I still have difficulty understanding how anyone east of the Berkshires gets significant snowfall and even there it doesn't seem to be close to being guaranteed.

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I thought we stopped taking the the SREFS until further notice.. nevermind 72 hours out. Yikes. I can't complain about the euro track verbatim given the timw of year. If this was February I'd be somewhat bummed..but any snow should be considered a bonus on the coastal plain in November. The fact that we are getting coastals is also a good sign heading into winter.

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FWIW(Very little at this range), SREFS look fantastic for pretty much everyone outside of the immediate coastal plain re. track. Not a huge lean to the west either which is nice to see, really, most of the lean is to the north which just indicates timing differences. 

The low is moving to the NNE-NE though. Spread to the NW of the low center would be "west" of the track.

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The low is moving to the NNE-NE though. Spread to the NW of the low center would be "west" of the track.

Look at the placement of the spread though, especially in the second picture, it's almost due north and pointing in the same direction as the mean low. Maybe I'm reading it wrong, but to me, that's suggesting the same general track at a different time and notsomuch a different track. 

 

We'll get a better idea when the plumes come out, but SouthCoastMA makes a good point in that we're wasting our time talking about the SREFS at this hour. 

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Mean qpf is over an inch for almost all of sne

FWIW(Very little at this range), SREFS look fantastic for pretty much everyone outside of the immediate coastal plain re. track. Not a huge lean to the west either which is nice to see, really, most of the lean is to the north which just indicates timing differences.

srefs 1.gif

srefs 2.gif

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Look at the placement of the spread though, especially in the second picture, it's almost due north and pointing in the same direction as the mean low. Maybe I'm reading it wrong, but to me, that's suggesting the same general track at a different time and notsomuch a different track. 

 

We'll get a better idea when the plumes come out, but SouthCoastMA makes a good point in that we're wasting our time talking about the SREFS at this hour. 

I'm not wasting my time. I haven't bothered looking for them. I'm just pointing out that some of that spread looks west of the track to me. It could have the low over Bermuda or James Bay and I wouldn't care less.

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looking at the text output from the European model, it looks as though about an inch of precipitation falls at BDLwith the 850 temps below - 2 with surface temps around 33 degrees. personally I would argue that with those rates we would probably drop down to freezing or slightly below. 850 then spikes all the way to + 7 with surface temps rising to about 34 before temperatures crash down into the upper twenties with some backlash precipitation. based on that data here in this neck of the woods I would probably go with a four to eight or five to nine thump with a flip to rain followed by a backlash changeover with an additional inch or two with falling temps. of course if the storm track continues west things could change.

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