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Dec 15-18 Arctic Front/Snow Thump/Meltdown to the Border


HoarfrostHubb

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1 hour ago, Damage In Tolland said:

Seems like an 8-10 hour period mostly Sunday morning of 40's.. perhaps low 50's in spots. Front crashes thru midday so it's not prolonged , but it may be enough to wipe out most of it. 

It keeps Greenfield area near 32 the entire time so Chris keeps his pack and MPM should keep some 

You'd probably have snow left if the GFS that was run from your basement verified.

gfs_6hr_snow_acc_boston_13.png

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6 minutes ago, dendrite said:

lol from Rangeley to Sherbrooke. 

Crazy as here is 6-hours earlier.

The RGEM has MVL going from 24F to 44F in that 6 hour time frame.  Probably see that move east as the front moves east and it all starts mixing out. 

Be interesting to see if that verifies here... 24F at 1am and 44F at 7am before probably back to 24F at 1pm, lol.

rgem_t2m_neng_15.png

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12 minutes ago, ORH_wxman said:

Btw Boston's low of 4F was the coldest December temp since 1989. ORH's low of -1 was tied 2004 and 1993 as coldest since 1989. 

That's an impressive stat right there.

I made it down to 1° but have had colder readings than that since 1989.  My 31 year record is just dominated by readings in 1989.  19 days have a record low set in 1989.

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4 minutes ago, MetHerb said:

That's an impressive stat right there.

I made it down to 1° but have had colder readings than that since 1989.  My 31 year record is just dominated by readings in 1989.  19 days have a record low set in 1989.

Yeah for rad spots it's a little different. 2005 in December had some great radiational cooling nights following the 12/9 storm but they were not as prolific in places like ORH or BOS. There's prob other sneaky dates in there that don't show up at all at a station like ORH. 

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24 minutes ago, powderfreak said:

Crazy as here is 6-hours earlier.

The RGEM has MVL going from 24F to 44F in that 6 hour time frame.  Probably see that move east as the front moves east and it all starts mixing out. 

Be interesting to see if that verifies here... 24F at 1am and 44F at 7am before probably back to 24F at 1pm, lol.

 

yeah it will!  

Will and I were just discussing that last hour about how nooormally you don't see 20-30 F temp jumps in 6 hours... There's a hand wringing grind there where the models bust too soon... and the temp manages to 36 for a couple of hours, too... it's just a mess than it flips...more like from 33 to 43...  

going to be interesting case study in the science of low level cold vs warm intrusion off the deck. 

this is also a classic set up in my mind to get a 3,000 foot els smoking over the top of strand valley chill, too.  

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28 minutes ago, Typhoon Tip said:

yeah it will!  

Will and I were just discussing that last hour about how nooormally you don't see 20-30 F temp jumps in 6 hours... There's a hand wringing grind there where the models bust too soon... and the temp manages to 36 for a couple of hours, too... it's just a mess than it flips...more like from 33 to 43...  

going to be interesting case study in the science of low level cold vs warm intrusion off the deck. 

this is also a classic set up in my mind to get a 3,000 foot els smoking over the top of strand valley chill, too.  

I can't think of the dates, but I seem to remember an event with a setup like this where Maine was modeled to mix out and never did: 28 at AUG and 45 at LEB and 55 at BOS at some point. Not sure if the dynamics align for this …

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2 minutes ago, ariof said:

I can't think of the dates, but I seem to remember an event with a setup like this where Maine was modeled to mix out and never did: 28 at AUG and 45 at LEB and 55 at BOS at some point. Not sure if the dynamics align for this …

it's a great approach actually ...  using some experiential reference to grapple (no pun intended) with the idiosyncrasy of this baby. 

i have been mulling over a few of those fail-to-mix-out blunders myself, but .. i don't know what the commonality is.  perhaps it's just the weight of the cold that's in place (like discussed earlier) being outpaced by the total speed aloft... i think viscosity in the atmosphere still has some sort of physical limiation on how fast it can be removed and exceeding that timing things could get dicey even in a situation with less actual blocking. 

weird - kind of like despite the present cold, warmth is the superior athlete heading through the weekend ...but it over commits on the play and shoots passed the target and the target then scores.  

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4 minutes ago, JC-CT said:

Any chance at some OES off the sound?

Yeah it def wouldn't shock me. Not envisioning some heavy squall off the sound but it could easily be the type of thing where weenie flakes are falling later tonight for a few hours well before the main synoptic stuff...or maybe it gives the synoptic stuff a little "boost" in the beginning before winds turn more east. 

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