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December 29-30 storm.


stormtracker

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Feels rather milder out there this a.m than it has in a few days, which doesn't give much confidence for a cold BL in 24hrs time...

Xmas night on the way back from RIC it was 46 degrees. When I woke up Wednesday morning I was sitting at 30. It can happen.

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i think people are overlooking the dry aspect of this. I know bl is important but it can be zero but with no moisture it's not gonna snow...this one just feels like a stuck in the middle type storm

Yeah that's possible I suppose. Drizzle obs for all.

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Trend towards an optimal vort pass isn't really there. That's prob #1. The weak low to our west is the dagger. I'm not giving up or saying it's a done deal but without improvements in those 2 departments we are going to suffer temp problems. Surface flow is easterly no matter which way you shake it.

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you think we are going to see greater than 10:1 ratios? lol

I think we end up with around .5 total QPF with 7:1 ratios. This is purely based on the the observations during the last two events. If the worst case scenario is .25 QPF with crappy surface temps.... and this over performs like the others two did, then the .5 with a 7:1 isn't out of the realm of possibilities for a Over Performance scenario.

The new NAM seems to support this.

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I think everyone in the 95 corridor should be bullish for mood flakes but pretty bearish for accums at this time. You can wishcast all you want about being wetter and slightly colder but having a vort pass nearly over head or to the west combined with an the surface low to the west will do absolutely nothing to help the argument that the models "are under doing the cold air".

Edit: my wag is 0-2" 95 corridor and maybe 3 out in leesburg / winchester but even there won't have easy stickage the whole time.

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I have no idea what you guys are looking at. The 12Z NAM is the best run in days for this thing to my weenie eyes. If you weren't worried about temps before no sure why this run would cause new concerns.

Maybe I'm too bearish but if we're going to have a borderline airmass as it is we really need a N-NE surface flow to have upside potential. That stupid low out west and closed 850 contour pretty much assures us of an e-se surface flow. I hope I'm wrong but I can't find the weenie glasses this AM.

I know most on here know this so it's a posting the obvious but this clip helps visualize what I'm talking about.

The large closed contour prohibits any cold air drain or CAD. Look at the flow on the western side of the contour. THAT is is we really need to get a "good" accum snow near the cities. Get rid of the stupid low out west and the contour is closed S & E of us. Voila, N winds and plenty of help. Is it going to work out that way? Nothing showing it yet.

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Maybe I'm too bearish but if we're going to have a borderline airmass as it is we really need a N-NE surface flow to have upside potential. That stupid low out west and closed 850 contour pretty much assures us of an e-se surface flow. I hope I'm wrong but I can't find the weenie glasses this AM.

My weenie glass says the last two times it snowed here it was progged to be mostly rain due to the "borderline air mass." Is this setup remarkably different?

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I think everyone in the 95 corridor should be bullish for mood flakes but pretty bearish for accums at this time. You can wishcast all you want about being wetter and slightly colder but having a vort pass nearly over head or to the west combined with an the surface low to the west will do absolutely nothing to help the argument that the models "are under doing the cold air".

Edit: my wag is 0-2" 95 corridor and maybe 3 out in leesburg / winchester but even there won't have easy stickage the whole time.

My forecast NAM temps don't go above freezing until after the precip ends. And snow sticks to snow pretty well. Give us the moisture.

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My weenie glass says the last two times it snowed here it was progged to be mostly rain due to the "borderline air mass." Is this setup remarkably different?

No high to the north might be a problem. Not as much for you

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