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Pre Xmas storm


mahk_webstah

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I don't think this is really a Lakes Region deal at all... CAA event vs CAD deal as was stated. Well above freezing in most valley locations in the Lakes. I could see a glazing as the boundary sags south on Sunday which would perhaps lead to some ice Ossipee to plymouth

This is classic CAD. It's so strong that we have low level CAA undercutting surging WAA aloft. Sorry, but I don't agree that we'll be well above freezing.
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I don't think this is really a Lakes Region deal at all... CAA event vs CAD deal as was stated. Well above freezing in most valley locations in the Lakes. I could see a glazing as the boundary sags south on Sunday which would perhaps lead to some ice Ossipee to plymouth

 

I'm not saying it will be the worst there, but those areas tucked in on the south and east side of the Whites such as that location and above 500-600' may have issues.

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This is classic CAD. It's so strong that we have low level CAA undercutting surging WAA aloft. Sorry, but I don't agree that we'll be well above freezing.

Well, yes it is CAD, but the region warmed well above freezing today in most spots. There will be a strong inversion and CAD but I would expect mid to upper 30s for much of the Lakes region. I wouldn't expect temperatures to drop much below 32-33 for tonight

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I'm not saying it will be the worst there, but those areas tucked in on the south and east side of the Whites such as that location and above 500-600' may have issues.

 

Yeah a light glazing. The area from TIlton to Plymouth will drain some of the cooler air from Maine as that boundary sags out. But I see plain rain for much of the event for central NH. Maybe a few hours of freezing rain sunday morning

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Yeah a light glazing. The area from TIlton to Plymouth will drain some of the cooler air from Maine as that boundary sags out. But I see plain rain for much of the event for central NH. Maybe a few hours of freezing rain sunday morning

 

I think the lakes region is in for more than light glazing. But like I said, it depends on how much QPF falls. To me, that is the bigger question.

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Well, yes it is CAD, but the region warmed well above freezing today in most spots. There will be a strong inversion and CAD but I would expect mid to upper 30s for much of the Lakes region. I wouldn't expect temperatures to drop much below 32-33 for tonight

 

Sunday is different then Saturday.

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Well, yes it is CAD, but the region warmed well above freezing today in most spots. There will be a strong inversion and CAD but I would expect mid to upper 30s for much of the Lakes region. I wouldn't expect temperatures to drop much below 32-33 for tonight

Yeah, but we're not talking about tomorrow. System 1 was always meh here (although it's close...32.5F right now). The question is how quickly and how far south can we get 32F in here on Sunday morning.

The 12Z 12km BTV WRF looks a lot like the euro op. The ec ens are almost evenly split here between a torch, a meh 32-34F rain, and then the op solution that falls into the mid 20s.

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Yeah, but we're not talking about tomorrow. System 1 was always meh here (although it's close...32.5F right now). The question is how quickly and how far south can we get 32F in here on Sunday morning.

The 12Z 12km BTV WRF looks a lot like the euro op. The ec ens are almost evenly split here between a torch, a meh 32-34F rain, and then the op solution that falls into the mid 20s.

Don't the models show it cooling sat night?
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I don't think anyone is calling for the Lakes Region to get the worst of it, but the CAD usually overperforms versus a 36-48hr prog of the GFS.

 

Yeah the retention of cold air is absolutely ridiculous in your neck of the woods and these events always seem to end up threading the needle there

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This event is just weird but yet fascinating...

 

You won't find many examples where Plattsburgh, NY along Lake Champlain is 19/18 with steady freezing rain, while Saranac Lake at 1,700ft is 34/34 with rain. 

 

We are talking a 15F difference in the lowest 1,200ft of the atmosphere right now. 

 

KPBG 202328Z AUTO 35007KT 5SM -FZRA BR OVC018 M07/M08 A2997 AO2 UPB2256E15FZRAE2256B15 P0002

 

KSLK 202314Z AUTO 00000KT 1 1/2SM RA BR OVC007 01/01 A2981 AO2 UPB2255E02RAB02 P0002

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34 in Bolton 26 in Ticonderoga

 

Just fascinating... its currently 37F at the base of Stowe and 40F at the base of Mad River Glen on the east slope higher elevations... those are usually the coldest locations in SWFE, but this is a whole other ball game from your typical mixed precipitation event.  This map looks exactly opposite of what 99% of mixed precipitation events turn out being like.  Usually the CPV is the warmest and east of the Spine the coldest.

 

Up in the Mansfield area, you can see the Stowe side is 37F currently while the Jeffersonville side of the notch is 27F.  That's about as big a gradient as you'll see between those two sites which are just a couple miles apart.

 

Dec_20_ice.png

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Lots of times the cold can slip pretty easily down Lake George from Ticonderoga to Bolton, but I dunno if there is any mechanism tonight. Tomorrow at this time there might be a northeast drain.

Im not really expecting much freezing rain here in Bolton but this is fairly unusual setup.  Will be interesting to watch the temps.  That weather station in Bolton is mine. 

http://www.wunderground.com/cgi-bin/findweather/hdfForecast?query=12814

Schroon lake to the north and a tag higher is also at 34.  The 26 in Ticongeroga is wild feedig right down the lake from BTV.

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