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November discussion


weathafella

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  On 11/18/2018 at 8:08 PM, CoastalWx said:

How come Snowman21 hasn't chimed in about the cold? Past out from excitement?

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I still can't get over we had a daily mean temp of 13F by mid-November.  Only because of a cheap 20F midnight High was the reason the daily mean was as high as it was!  Daytime temps were low teens even in the valley.

Heck today is min of 13F, high of 28F...cold snowpack.  It might as well be January.

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  On 11/18/2018 at 8:42 PM, powderfreak said:

I still can't get over we had a daily mean temp of 13F by mid-November.  Only because of a cheap 20F midnight High was the reason the daily mean was as high as it was!  Daytime temps were low teens even in the valley.

Heck today is min of 13F, high of 28F...cold snowpack.  It might as well be January.

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Impressive and a great way to start.

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  On 11/18/2018 at 8:46 PM, Ginx snewx said:

Impressive and a great way to start.

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Love the big cold this time of year as it extends the winter season.  Below normal early and late season, near normal in mid-winter...that's how New England has a long winter.  

Excited that SNE has been right in the thick of it too now.  Good stuff.

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  On 11/18/2018 at 8:53 PM, WxWatcher007 said:

It has been a very nice start. Not only that, but the medium to long range looks good too. It's great to march into winter with no big red flags flying. Hard not to really like where we all stand right now. 

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The big thing too is that we aren't wasting the cold like seems to happen so often in November.  We've had winter weather events and cold temperatures.   I think that's a big part of it... if it was just cold stick season without the snow, it would likely just be annoying lol.

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  On 11/18/2018 at 9:26 PM, DomNH said:

18z NAM a hair less amped. Looks like a decent wet snow thump Rt. 2 north. 

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Digging into the 3km NAM rime factors, there is definitely a threat for mixed precip along and just N of Route 2. It has that 2-5 number that is typical of heavily rimed flakes, with true mixed precip values down around the Pike and S. 

The MHT to PWM line and N looks like they're in a good spot for a nice snowfall.

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  On 11/18/2018 at 9:43 PM, OceanStWx said:

Digging into the 3km NAM rime factors, there is definitely a threat for mixed precip along and just N of Route 2. It has that 2-5 number that is typical of heavily rimed flakes, with true mixed precip values down around the Pike and S. 

The MHT to PWM line and N looks like they're in a good spot for a nice snowfall.

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I must be near the northern edge of the mix...how does KASH look?

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  On 11/18/2018 at 9:43 PM, OceanStWx said:

Digging into the 3km NAM rime factors, there is definitely a threat for mixed precip along and just N of Route 2. It has that 2-5 number that is typical of heavily rimed flakes, with true mixed precip values down around the Pike and S. 

The MHT to PWM line and N looks like they're in a good spot for a nice snowfall.

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Could be kind of high impact if it sticks to pavement. Either way the ugly oak leaf infested pack persists. 

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Exciting to see WPC talking about big NAO and AO blocking setting up later in week into next week.  These big events often last for 4-6 weeks yes?  I would think the storm over the weekend would be borderline for many but that soon after the block would allow some fresher cold air to come in and a big storm toward month's end.  Once these blocks set up, shite starts to happen with the modelling.

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  On 11/18/2018 at 9:52 PM, 40/70 Benchmark said:

Thanks.

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While snow accumulation maps are traditionally garbage, the nested NAM and the HRRR I believe are the only two models that explicitly forecast precip types, and therefore can distribute QPF into the correct accumulation.

So the NAM nest looks at the rime factor, and places a snow ratio on that based on the value. Most models snow is treated as 10:1 or Kuchera as long as the model supports snow or sleet. So the nested NAM may not be right, but the snow accumulation map is most realistic based on model output.

I should also say the Canadians do separate ptypes, and produce snow only output.

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