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Feb. 19th 2012 Winter Storm Obs./Disc.


WilkesboroDude

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Thanks. I really hope we can pull out a surprise!

Me too- just watch for the precip in TN to pivot due east- if it starts to pivot NE substantially, we are screwed- there is going to be a very sharp cut-off, unfortunately....judging by obs. to the north and the decent NNE-NE wind component ,getting the cold air in suprisingly isn't going to be an issue- it is one of those rare scenarios

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This low is not going to be bombing out even when the energy phases offshore. Most data has it only dropping down to 995 mb and then getting absorbed into the bigger cyclone across the N. Atlantic. A few mb here are there is not going to make any difference in NC.

Is there anyone at this point that still sees any possibility of the coastal bombing out any sooner than the models are forecasting, or is that pretty much completely off the table at this point?

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You guys up towards the boarder that are already reporting some mixing, Reidsville/Hillsborough, I would be pretty encouraged based on the radar over TN. Looping it maybe a few isolated bands getting up to DC, but the heaviest axis is going to be south of RIC, likely right along or just south of the VA boarder.

post-382-0-62298100-1329664712.jpg

post-382-0-23314300-1329664183.jpg

Big time melt going on over Nashville

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Hi everbody I am currently 12 miles northeast of Greensboro and it is already sleeting here. Winds out of the NNE.

The NAM had GSO at roughly 10:00am (15z) as sleet, or close to it, so it seems to have a handle on the storm. Someone correct me if I am wrong, but for GSO airport code at 15z it looked like a ice profile.

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12z NAM has RDU with roughly 4.5" of snow, I think you can cut that in half, so 2-3" look reasonable to me, I think this could cover the trees/grass...

9 02/19 21Z 37 35 34 13 0.18 0.02 547 554 2.3 -19.0 1009 100 -TSRA 003OVC210 0.0 4.0

12 02/20 00Z 34 32 15 14 0.48 0.00 543 551 -0.6 -20.3 1011 100 SN 000OVC243 2.5 0.4

15 02/20 03Z 33 31 10 14 0.20 0.00 540 551 -0.7 -20.6 1013 100 -SN 000OVC106 2.0 3.0

18 02/20 06Z 33 32 351 12 0.02 0.00 539 551 -1.0 -19.9 1015 100 000OVC099 0.0 15.4

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The models are showing an E-W band setting up, around or shortly after 0z tonight. The RGEM/NAM/RUC all show this, now where it sets up is up in the air, but somewhere along I-40 looks promising, could be north could be south...

RUC_255_2012021914_F12_RH_700_MB.png

I like where it depicts the highest RH values...right over my house. I'm certain it'll work out exactly like that. :)

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The models are showing an E-W band setting up, around or shortly after 0z tonight. The RGEM/NAM/RUC all show this, now where it sets up is up in the air, but somewhere along I-40 looks promising, could be north could be south...

RUC_255_2012021914_F12_RH_700_MB.png

Another thing this map shows it the beginning of an end to the precipitation in the Foothills and the Western Piedmont as the NW flow in the mid levels start drying things out.

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Most folks in NC and VA are not even into the insane rates that they will experience back in Tennessee...

Crossville, TN has picked up .37" of liquid precip. in the last two hours.

Nashville, TN picked up .18" of liquid precip. in the last hour.

Knoxville, TN picked up .18" of liquid precip. in the last hour.

Despite this, a lot of areas are already starting to change over across NC/VA, and those that haven't will soon have plenty of diabatic cooling via melting snowflakes. Wherever that band between Knoxville and Nasheville pivots is going to to experiencing precipitation rates between .1-.2" per hour, which given a direct 10:1 snowfall ration would be 1-2" per hour.

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Not surprised coming from you, but you dont need 100% humidity to get precipitation. As long as theres sufficient lift which there will be you can get precip out of it. Stop relying on models for every little parameter.

As much as I hate to agree with Tullioz, he's right about the main band being north of the NC/VA border. That's becoming abundantly clear with the short term models.

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