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February Med/Long Range Discussion Part 2


WinterWxLuvr

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Weekend cold looks pretty legit though backing down a little as we close. Record soundings for Feb are about -25C at 850mb (since 1948). Could get close.

single digit lows subday should be attainable. The near or slightly below 0 lows the euro had been showing seemed extreme.
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The western atlantic ridge really flexes leading into the potential but the airmass exiting is a beast. I would think even a flip event would do something. Gotta root for the storm (if there is one) to not drag it's feet. There is nothing showing up to lock the cold high in place.

maybe we can get a similar thump to what we got last late february when it was just so cold that the bad track didnt matter

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Gotta say otherwise the LR pattern isn't really cooperating as I'd hoped. Weeklies go to week 6 now?

I've thought for a while we would have to go through a relax before ridging rebuilds where we want it over Canada. Looks like it's not too bad and then things should get good. By day 15 I like how things look upstream in Alaska and Canada to reload. But feb 18-24 is probably meh. Hopefully we can score something before then wait for our juiced up gulf low late feb or early March then our crazy cut off March 58 replay mid month.
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The good news is the para euro is a miller A. The bad news is it takes to long to get up the coast. Still a couple inches with the front end but then a depressing progression.

Other than the temps, the track is a monster!

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I doubt it Yoda ...trough still positive at 144 ..probably a front end to mix ..my guess

 

Respectfully disagree. Look @ where the HP is. That is SE wind hell. Yeah, @ the 144 frame the trough is positive, but there is nothing in SE Canada to keep it that way, it would QUICKLY cut. Doesn't mean there can't be a thump, but the Ukie is not what you want to see

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Yup, this pretty much sums up what the problem is, at least from last night's run. Good explanation. Unfortunately the "pretty blue ball" is off the southern tip of Greenland, instead of near 50/50 with some nice blocking showing up northeast of there. Oh well. We'll most likely have to hope we can make the best of an imperfect setup. Maybe something like last February, when we were spotted a 20 degree buffer? Unless things change a bit for the better. Lots to see in the upcoming days.

I'm thinking about the same thing from last year. Non-ideal setup, but so cold that it didn't matter, lol If I had to bet, I'd bet it could be the same case again if it's timed right!
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Yep, HP off the NE coast and a deep trough....that would surely cut. 

 

GGEM has a decent thump, goes from snow to either sleet or freezing rain.

 

 

If I am reading the model right, 12z UKIE would be a cutter, no?

 

 

I doubt it Yoda ...trough still positive at 144 ..probably a front end to mix ..my guess

 

 

Yep, HP off the NE coast and a deep trough....that would surely cut. 

Good news.  

 

At least cutters produce precipitation.

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This is a different setup but the cold could help in forcing the track towards the coast. From range models might miss it but it's gonna be hard for a low to cut up into that airmass. Looking at the ggem for instance. Typically when a storm starts as snow all the way down to nc we don't have to worry about a major changeover. Ending as drizzle and dry slot sure but how often do we get 6" of shoe then a driving rainstorm. It can happen but less likely then the low taking a track of less resistance towards the warmer water off the coast.

ETA: to be clear I see the issues with ridging northeast of us and why this would and could try to cut but at the same time I can see how this could be forced easy enough that we thump with the cold abd by the time it warms up we just dry slot or its over.

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This is a different setup but the cold could help in forcing the track towards the coast. From range models might miss it but it's gonna be hard for a low to cut up into that airmass. Looking at the ggem for instance. Typically when a storm starts as snow all the way down to nc we don't have to worry about a major changeover. Ending as drizzle and dry slot sure but how often do we get 6" of shoe then a driving rainstorm. It can happen but less likely then the low taking a track of less resistance towards the warmer water off the coast.

ETA: to be clear I see the issues with ridging northeast of us and why this would and could try to cut but at the same time I can see how this could be forced easy enough that we thump with the cold abd by the time it warms up we just dry slot or its over.

 

 

Outside of a major coastal, what you just described is my ideal storm.  They never disappoint on the precip side, and the cold is usually more potent than is modeled, especially this time of the season.  And, truthfully, I like it when snow gets a coating of sleet and freezing drizzle on it.  Gives it staying power.

 

Edit:  And you're right.  They almost always transition to a period of drizzle/freezing drizzle and then nothing.

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This is a different setup but the cold could help in forcing the track towards the coast. From range models might miss it but it's gonna be hard for a low to cut up into that airmass. Looking at the ggem for instance. Typically when a storm starts as snow all the way down to nc we don't have to worry about a major changeover. Ending as drizzle and dry slot sure but how often do we get 6" of shoe then a driving rainstorm. It can happen but less likely then the low taking a track of less resistance towards the warmer water off the coast.

ETA: to be clear I see the issues with ridging northeast of us and why this would and could try to cut but at the same time I can see how this could be forced easy enough that we thump with the cold abd by the time it warms up we just dry slot or its over.

I don't think we've ever gotten 6 inches of shoe, but there's always a first time.  I hope its not high heels though.  

 

On a serious note, I agree with most of what you're saying.  I'd be fine with a thump and then a switchover to drizzle.

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So, are we looking for that magical "good" pattern again?  Two weeks ago weren't we talking about it being here soon?

 

We actually are in a great pattern today, we just got severely unlucky on how both of these lows (the one yesterday & today) interacted. The setup we just experienced could have delivered a MECS. We had a 970mb low at our latitude out in the Atlantic with a HP in a good spot, we just got screwed that it just didn't turn negative and/or phase in time. Then today's system could have blown up but the spacing between the 2 just didn't allow for it. 

 

Just because you have a good pattern doesn't mean you cash in. 

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I think the last time a decent snowfall changed over to a driving rainstorm was Dec 13, 2003... I was out of town and I have no regrets about missing it.

yea I was actually thinking of that exact event as the only time I can remember such a thing. That was a weird situation though. There was a waa burst associated with a frontrunner wave. Then a lull before the main show which was an inland runner. I also remember the snow from wave 1 was northern va north. I can't remember any event where it started as snow in Charlotte and Raleigh nc and changed to significant rain here. Now if the models are wrong about how much low level cold there is sure but if they are right about where the thermal boundary will be at the start I doubt it warms fast enough to prevent major accumulation first here.
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