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Countdown to Winter 2017-2018 Thread


eyewall

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  On 10/10/2017 at 3:52 PM, ORH_wxman said:

I'll add the the pike region in the past has frequently been a dividing line in overrunning events. Esp during that 2007-2008 season, but it's happened in some other events too since then...the terrain over western and central MA and the high pressure orientation (frequently N of Maine funneling the arctic air down the coast into E MA) in these events make the pike region kind of the battle ground for the cold air vs the WAA to the southwest, and you'll see the sleet/snow line begin to meet a lot of resistance in that zone.

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In the words of The Boss, "Down here it's just winners and losers and don't get caught on the wrong side of that line."

 

Also, be mindful of Route 2.

 

  On 10/11/2017 at 3:04 AM, ORH_wxman said:

Go big or go home:

 

 

2000-2001snowfall.jpg

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She's a beaut, Clark!  I loved that one.

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I finally looked at the monthly H5 breakdown on the euro seasonal. While Feb and Mar may play with fire as verbatim...Dec and Jan looked pretty good..esp December. Looks like typical Nina only with maybe less of a typical -PNA? I didn't see a -NAO really, but overall heights near AK to the N Pole were above normal. 

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  On 10/11/2017 at 11:57 AM, CoastalWx said:

I finally looked at the monthly H5 breakdown on the euro seasonal. While Feb and Mar may play with fire as verbatim...Dec and Jan looked pretty good..esp December. Looks like typical Nina only with maybe less of a typical -PNA? I didn't see a -NAO really, but overall heights near AK to the N Pole were above normal. 

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Yeah it doesn't look like a -PNA until February.

 

December looks really cold on that H5 map...esp for northern tier. Probably a lot of Scooter sprawling prairie highs.

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  On 10/11/2017 at 4:01 PM, 40/70 Benchmark said:

I don't think he is implying anything about the coming winter,  but rather mocking those who blindly go cold in the east.

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Yeah I kind of took it as that...GEFS show a coldish pattern in late October so some will think that is "the winter pattern setting up".

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  On 10/11/2017 at 4:22 PM, 40/70 Benchmark said:

That is the recipe for a real good snowstorm here...really until mid January.

Before that is dicey due to marine influences.

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Yeah, Being further south, Your area is more prone to that, We rocked that season right out of the gate here in December, I would welcome that scenario again .

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  On 10/11/2017 at 4:25 PM, WxBlue said:

Not familiar with the acronym. What's the full definition of SWFE? Southwest flow event?

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Yes, Most of these systems originate in the SW and move NE and off the NE coast, If your on the northern side of the front, They can produce moderate snows with the warmer air riding over the top of the cold air at the surface.

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  On 10/11/2017 at 4:25 PM, dryslot said:

Yeah, Being further south, Your area is more prone to that, We rocked that season right out of the gate here in December, I would welcome that scenario again .

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I don't see why we can't displace things 30-50mi south this season, either.

ENSO is weaker, and I think that is manifesting itself in the PDO, as some others have pointed out.

The se ridging may be a hair less assertive.

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  On 10/11/2017 at 4:27 PM, 40/70 Benchmark said:

I don't see why we can't displace things 30-50mi south this season, either.

ENSO is weaker, and I think that is manifesting itself in the PDO, as some others have pointed out.

The se ridging may be a hair less assertive.

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I agree, Its not looking like its going to flex its muscle over the long haul, I really am optimistic about this winter, Of course no one can foresee some bad luck that can and will happen with some of these systems over the entire winter, Just want to win more then you lose as long as its active, It should be fun.

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  On 10/11/2017 at 4:27 PM, dryslot said:

Yes, Most of these systems originate in the SW and move NE and off the NE coast, If your on the northern side of the front, They can produce moderate snows with the warmer air riding over the top of the cold air at the surface.

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The synoptic mechanics of it are that the low redevelops into a triple point just near the south coast from the surface up, due to the immense confluence to the northeast (high)....thus the capacity of the high to negate the vestigial WAA from the parent low is attenuated with height...ie the profile is slanted. The surface remains colder, while the warmth overtakes the mid and upper levels, hence the sleet...but once sufficient latitude is achieved, the entire column succumbs to the colder redevelopment.

The latter point will occur at a lower latitude relative to that this season, this year imho.

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  On 10/11/2017 at 4:33 PM, 40/70 Benchmark said:

The mechanics of it is that the low redevelops into a triple point just near the south coast, from the surface up....thus the capacity of the high to negate the WAA from the parent low is attenuated with height...ie the profile is slanted. The surface remains colder, while the warmth overtakes the mid and upper levels, hence the sleet...but once sufficient latitude is achieved, the entire column succumbs to the colder redevelopment.

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A good high to the north also enhances the frontogenesis...it's what helps a mundane transition event (or mundane overrunning event if you stay all snow) turn into a big front end thump with several hours of heavy snow.

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  On 10/11/2017 at 4:33 PM, 40/70 Benchmark said:

The mechanics of it is that the low redevelops into a triple point just near the south coast, from the surface up....thus the capacity of the high to negate the WAA from the parent low is attenuated with height...ie the profile is slanted. The surface remains colder, while the warmth overtakes the mid and upper levels, hence the sleet...but once sufficient latitude is achieved, the entire column succumbs to the colder redevelopment.

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In some instances, There is really no primary low and its more of a series of weak waves of LP moving along the front with a high to the north to keep the colder air in the mid levels and the surface.

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