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First weekend of Feb storm


Ian

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Yeah I noticed what appeared to be a slight 500 vort improvement on the 12z nam. It seemed slightly south of it's previous runs. Am I wrong to think that if the 500 vort were to come just south of us we would have a better chance of a little wraparound?

yeah but it still has a bit to go. the 6z gfs was almost tantalizingly close to being interesting. that solution is only valid for a few more min tho.

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last week we had a well developed comma way to the west this time we are looking for it to develop right overhead/mainly west. not the best recipe. this is a long thread for a rainstorm. ;)

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it's more or less the same.

It's pretty similar and suggests the potential for a brief period of snow at the end of the storm but even then I think the boundary layer temps will be marginal. I think in terms of temps it might not be quite as good as the surface zero line is well to our north and west and 54 and only gets to dc at around 60.

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last week we had a well developed comma way to the west this time we are looking for it to develop right overhead/mainly west. not the best recipe. this is a long thread for a rainstorm. ;)

Yes and we had an 850 low go to our south, this time we had no 850 low and gneral warm advection out ahead of the system and then have to get enough vorticity advection to hope that it overcomes downsloping as the low pulls away. A much different animal.

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Looks pretty similar to 6z. GFS continues to weaken that northern vort, which is good for us. The southern vort also was progged to go to our west for so long and now it basically goes overhead around hour 57. If we can get that pushed even farther south, areas N/W of 95 might be in business. Verbatim, 12z GFS is probably dusting-2" for areas N/W of 95 at the tail end...probably associated with the vort passage.

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Problem I see is even if we can get the 500's to cooperate we are still dealing with very marginal temps at best throughout the lower atmosphere and the surface, and I just can't see enough dynamics to overcome that.

GFS sounding at 60hr for BWI is above freezing from about 925mb and below. But max temp in that column is 2.6C. So if areas farther N/W are a bit colder, I can see that as snow.

Actually...the 57hr (when the precip is likely falling) actually has a colder profile. Below freezing down to 950mb and max temp of 1.7C right at the surface. That should be snow.

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GFS sounding at 60hr for BWI is above freezing from about 925mb and below. But max temp in that column is 2.6C. So if areas farther N/W are a bit colder, I can see that as snow.

Actually...the 57hr (when the precip is likely falling) actually has a colder profile. Below freezing down to 950mb and max temp of 1.7C right at the surface. That should be snow.

I could see it ending as a brief period of snow but don't see it having any potential to accumlate as I don't see this as having high precipitation rates.

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