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NYC/PHL Jan 18-19 Potential Threat Thread


am19psu

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Guest Patrick

If you look at this run, and contemplate the pattern of the past two months, it is not difficult to see how this benefits us in the long range....if ever there was a year to bet on a February blizzard to round out the season, this is it.

good ridging setting up over the west around days 9-10 but were back to the pattern of retrograding systems to our north. :arrowhead:

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The posatives are that the pattern shows no signs of the dreaded la nina SE ridge. Instead looks like fairly presisten troughing in the east and a ride out west with an acitve southern stream. Obviously its super fantasy range but the pattern looks very interesting as well for the day 14-16 time frame.

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Pretty strong and consistent signal on the models that the peak of the cold will occur next weekend betwen fri night and sunday (1/21 - 1/23). Also looks like a light or moderate snow potential leading up to that cold 1/20 - 1/21..

Looks like the GFS ensemble mean also has this potential

12zgfsensemblep12180.gif

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Seems like we have one 'warm' day in the 40s on tuesday but really not that much of a torch. Will be interesting to see how the snowpack does but even if we lose half, it will just have another inch of water in it. Keeps the cold and several light snow events for the duration of the month, which makes sense if we do truly get an arctic outbreak.

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If you look at this run, and contemplate the pattern of the past two months, it is not difficult to see how this benefits us in the long range....if ever there was a year to bet on a February blizzard to round out the season, this is it.

Definitely-- and la ninas tend to produce in February (February 1967 and February 2006 are two examples).... I'd venture to guess we'll see a larger area of widespread snow in a February snowstorm than either of the last two. I still think we'll see something in March also-- but February is favored to be our biggest month of winter weather.

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maybe briefly.. between 06Z and 12Z on Tuesday.. but it's very light QPF during that time frame.. and the warm air looks like it has no trouble making its way northward.

I'm surprised the warm air is shown to make such a quick path northwards on the models with the high just leaving Quebec.

I wonder if we'll see some colder solutions, at least in terms of 2m temps, as we approach the event.

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I'm surprised the warm air is shown to make such a quick path northwards on the models with the high just leaving Quebec.

I wonder if we'll see some colder solutions, at least in terms of 2m temps, as we approach the event.

it's possible the models might not be able to pick up on the shallow cold air.. High pressure is still in good control even into Monday night.. if we radiate early, then it might be possible... to be quite honest... it's not like southeasterly winds are screaming in the area.. the flow looks relatively light.

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it's possible the models might not be able to pick up on the shallow cold air.. High pressure is still in good control even into Monday night.. if we radiate early, then it might be possible... to be quite honest... it's not like southeasterly winds are screaming in the area.. the flow looks relatively light.

When does the storm start hitting the area on the Euro? Is it Monday night?

It sounds as if the 2m and 850 line are pretty similar in their advancement north...

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it's possible the models might not be able to pick up on the shallow cold air.. High pressure is still in good control even into Monday night.. if we radiate early, then it might be possible... to be quite honest... it's not like southeasterly winds are screaming in the area.. the flow looks relatively light.

do any (or all) of the models take the snow pack on the ground into consideration when figuring their upcoming solutions (relative to temperature)??

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The global models definitely do. This is from 2003 and I'd imagine that the radiation scheme has been updated to better handle it since then.

http://www.emc.ncep....oorthi/gam.html

Thanks! I pulled out the blurb about snow cover so folks can read.

Snow cover is obtained from an analysis by NESDIS (the IMS system) and the Air Force, updated daily. When the snow cover analysis is not available, the predicted snow in the data assimilation is used. Precipitation falls as snow if the temperature at sigma=.85 is below 0 C. Snow mass is determined prognostically from a budget equation that accounts for accumulation and melting. Snow melt contributes to soil moisture, and sublimation of snow to surface evaporation. Snow cover affects the surface albedo and heat transfer/capacity of the soil, but not of sea ice. See also Sea Ice, Surface Characteristics, Surface Fluxes, and Land Surface Processes.

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