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Monitoring a potential important TV to East Coastal storm: Jan 17


Typhoon Tip
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3 minutes ago, dendrite said:

This is going to be in and out of here relatively quickly. So I’m selling those modeled 1.5” QPF bombs in 6 hours in the form of snow. I could see a couple of hours of heavy here and maybe 4-5 hours around Gene, but I think there’s going to be a period where the models are indicating a ptype of snow, but the column below 850 is marginal or +1C near the surface and it’s just slobbering paste or catpaws mixed with rain. Eventually we all flip to liquid and the new pack becomes a slush puppy…especially down our way. That’s where I lean right now. There’s not much of a mechanism to hold the cold in. There’s a little in-situ CAD, but strong E flow can quickly erode that away. The large pressure falls are to our west so we’re not getting that northerly isallobaric component. It’s just a massive push of WAA in a short amount of time…except it’s backing in more from the east instead of the usual SW WAA we get in a SWFE. 

Unlike some, usually when you’re hopeless you’re right.

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The GFS ptype maps on COD have me getting heavy snow at 51hr, but when you look at the sounding it’s +2C at H95.

Date: 51 hour GFS valid 15Z MON 17 JAN 22
Station: 43.43,-71.62
Latitude:   43.43
Longitude: -71.62
-------------------------------------------------------------------------------
LEV PRES  HGHT  TEMP  DEWP  RH  DD   WETB DIR SPD THETA THE-V THE-W THE-E   W
     mb     m     C     C    %   C     C  deg knt   K     K     K     K    g/kg
-------------------------------------------------------------------------------
SFC  953   267   1.9   1.8  99  0.2   1.8  88  16 278.9 279.7 277.4 291.5  4.56
  2  950   289   2.0   1.8  99  0.2   1.9  93  24 279.2 280.0 277.5 291.8  4.57
  3  900   725   0.1   0.1 100  0.0   0.1  98  46 281.6 282.4 278.4 293.6  4.28
  4  850  1182  -1.5  -1.6  99  0.1  -1.5 106  58 284.6 285.3 279.5 295.9  4.00
  5  800  1663  -3.3  -3.5  99  0.2  -3.4 115  69 287.6 288.3 280.6 298.2  3.69
  6  750  2172  -4.7  -5.0  98  0.3  -4.8 127  79 291.4 292.1 282.1 301.7  3.51
  7  700  2715  -5.4  -5.8  97  0.4  -5.5 142  84 296.5 297.2 284.2 307.1  3.55
  8  650  3294  -8.0  -8.5  96  0.5  -8.2 147  82 299.9 300.5 285.1 309.4  3.09
  9  600  3912 -11.2 -11.9  95  0.6 -11.5 149  80 303.1 303.6 285.7 311.1  2.56
 10  550  4574 -15.2 -15.7  96  0.5 -15.4 151  76 306.0 306.4 286.2 312.5  2.04
 11  500  5288 -19.8 -20.3  95  0.5 -19.9 156  72 309.0 309.2 286.7 313.9  1.52

BA168BB3-6229-4B90-8B0C-B014EA1D840D.png

 

 

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4 minutes ago, mahk_webstah said:

Unlike some, usually when you’re hopeless you’re right.

I'm not trying to poo poo it. I just think there's a lot of flags and I wouldn't be going aggressive onto the colder side of guidance. A lot has to go right for us to see big paste out of this. Phin's in another world with his east facing terrain which may help him squeeze out another 1F colder and more QPF.

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Gene is a tough one...with his elevation and interior location a couple ticks colder and he could be in business for something bigger. But I just feel like this ends up something closer to the NAM. Of course the Euro is coming out now and it'll probably give him 15" in a few minutes. lol

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12 minutes ago, mahk_webstah said:

Unlike some, usually when you’re hopeless you’re right.

I agree with you. The 'hope' side of me was pushing the logical/science side :-(.  We have the day off in the State so it's always a good day for snow. Oh well, the Old School New Englander in me will hope our little corner of the world (Concord, Boscawen, Northfield) will remain unique and fun in our weather forecasting. :-)   Bottom line, BE SAFE everyone on Monday - Jack

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7 minutes ago, dendrite said:

Gene is a tough one...with his elevation and interior location a couple ticks colder and he could be in business for something bigger. But I just feel like this ends up something closer to the NAM. Of course the Euro is coming out now and it'll probably give him 15" in a few minutes. lol

I do wonder if the QPF on that warm conveyor belt is a bit over-modeled.  Often we see those like 1” in 6 hour stuff end up verifying a bit less.  I know we’ve seen it in colder snowstorms where models have a wall of 0.75-1.25” in 6 hours that ends up around 0.50-0.75” or something… still a heavy band tipping the bucket but not quite to the modeled amounts.  The orographics into the Whites though is different than say a push through SNE.

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6 minutes ago, dendrite said:

Maybe a tick colder, but not much difference. What a QPF bomb though...like 1.25" in 6hrs. Whoever is getting snow in that will be getting 2-3"/hr. Romping in Randolph.

I would’ve told family we’ve got a pipe burst in Randolph and need to get up there to fix it in a hurry.  Any number of excuses to return there from MD :lol:.

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Just now, powderfreak said:

I would’ve told family we’ve got a pipe burst in Randolph and need to get up there to fix it in a hurry.  Any number of excuses to return there from MD :lol:.

If I don't give my wife a week back in MD once in a while to see the family she will probably stop coming with me up there so this is the tradeoff. ;) 

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