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February Mid/long Range Winter Discussion


TARHEELPROGRAMMER

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So you don't think the ensemble means can go back the other direction if they made that big of a jump in one cycle? Maybe we can only get things like that to trend in a worse direction instead of a better one.

Brick they were our last hope. Give up like the rest lol

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Brick they were our last hope. Give up like the rest lol

 

It's one cycle, and we still have a few days to go. East posted that video early this morning. If he says there is still a lot of uncertainty and the models are not handling it well and having wild swings, then I tend to believe him when he says all options are still on the table now.

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It's one cycle, and we still have a few days to go. East posted that video early this morning. If he says there is still a lot of uncertainty and the models are not handling it well and having wild swings, then I tend to believe him when he says all options are still on the table now.

He also said that he's forecasting a rain event right now and the southeastern track that the storm would take to give the western Carolinas snow is an outlier.
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It's one cycle, and we still have a few days to go. East posted that video early this morning. If he says there is still a lot of uncertainty and the models are not handling it well and having wild swings, then I tend to believe him when he says all options are still on the table now.

Well think of it this way...

 

Matt said the models aren't handling the system right, while true that can't be interpreted to the EPS not handling the system right. Keep in mind the reason ensembles were developed, to adjust for small differences that the operational has wrong at initialization. So the mean track now has a huge cluster of lows over TN @ hr 132 with only a handful of lows that are not clustered off the coast. What that tells me is two things 1) The EPS favors Miller B at the very least 2) More than likely it now favors an inland track. You don't normally see big jumps in the EPS like this and I doubt it "jumps back" to the coast after such a dramatic change. Even then, we are simply lacking cold air. This one is done.

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Look, here is the high-scoring king Euro depiction at 5 days:

 

The PV is WAAAAAAY up in central Canada.  Sure, the PNA ridge is pretty nice, but look at the flow.  The storm track is such that the low would almost certainly track over land.  But let's assume it didn't.  Even if it takes the perfect track, it will be rain for areas outside the mountains (and even there, it would be very iffy).  That is, of course, unless the low bombs out like it was showing several days ago.  And even then, it would be a close call for some.  But no model is showing that.  Considering that and the fact that we see a thousand bombs at D10 all winter long that actually materialize as marginal storms, the odds are very long indeed that we get a bomb.  And look at where all of the really cold air is...WAAAAAAY up in Canada.  Can things trend colder?  Sure.  38 and rain instead of 45 and rain.

 

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why is it we get these great storms showing up 10 days out then 2 days later its just a rain event.  I would think by now all the models could predict better 10 days out than what they do being all the improvements to the models.

 

 

It's not an issue of the models being bad, it's an issue of data ingestion.  The models work fantastically, but they don't receive enough data.  Brad P had a nice post on this recently.  Until we can sample the atmosphere at each and every cubic inch in each and every layer, we will not get extremely accurate predictions multiple days in advance.  Meteorology is not fortune-telling.  It will continue to be an inexact science for years to come, and it would behoove us all to come to grips with that, rather than complaining ad infinitum.

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Look, here is the high-scoring king Euro depiction at 5 days:

The PV is WAAAAAAY up in central Canada. Sure, the PNA ridge is pretty nice, but look at the flow. The storm track is such that the low would almost certainly track over land. But let's assume it didn't. Even if it takes the perfect track, it will be rain for areas outside the mountains (and even there, it would be very iffy). That is, of course, unless the low bombs out like it was showing several days ago. And even then, it would be a close call for some. But no model is showing that. Considering that and the fact that we see a thousand bombs at D10 all winter long that actually materialize as marginal storms, the odds are very long indeed that we get a bomb. And look at where all of the really cold air is...WAAAAAAY up in Canada. Can things trend colder? Sure. 38 and rain instead of 45 and rain.

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That's great and all, but what does the new king and prince say! The NAM and RGEM!?
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I think it is become clear now that any wintry precipitation the remainder of the winter will be confined to west of 77 in NC and possibly Tenn. and even they may have to get lucky. Even though the indices after Mar 1st look decent (-NAO, -AO, +PNA and -EPO), it is unlikely we will score if the current 5H projections end up being accurate.

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All the Debbie Downers in here! So the ensembles basically all shifted 300 miles west !?

They can just as easily shift 500 miles SE again and bring down 20 degree colder air! We are still 5 days away, jeez ! And storms always dissapear 8 days out on the GFS or flip to rainstorms, the 4" of sleet runs will be back and the Euro should start picking up on it in the next day or two ! The pattern looks amazeballs Fro the 24th-5th timeframe ! I'm all in on our best look all winter! Game on, two legit threats!

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I think it is become clear now that any wintry precipitation the remainder of the winter will be confined to west of 77 in NC and possibly Tenn. and even they may have to get lucky. Even though the indices after Mar 1st look decent (-NAO, -AO, +PNA and -EPO), it is unlikely we will score if the current 5H projections end up being accurate.

huh? 500mb pattern looks good on the ensembles.
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It's not an issue of the models being bad, it's an issue of data ingestion.  The models work fantastically, but they don't receive enough data.  Brad P had a nice post on this recently.  Until we can sample the atmosphere at each and every cubic inch in each and every layer, we will not get extremely accurate predictions multiple days in advance.  Meteorology is not fortune-telling.  It will continue to be an inexact science for years to come, and it would behoove us all to come to grips with that, rather than complaining ad infinitum.

 

 

That makes sense. What doesn't make sense is why they do all these upgrades to the models but then don't add more weather balloon launch sites or upgrade their system of data ingestion.

 

So that brings up the question as to why do they bother running a single model past about 5 days if the chances of it verifying are so small? Five days is even pushing it for accurate forecasts these days with the models. We might as well throw darts at a weather map on the wall.

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That makes sense. What doesn't make sense is why they do all these upgrades to the models but then don't add more weather balloon launch sites or upgrade their system of data ingestion.

 

So that brings up the question as to why do they bother running a single model past about 5 days if the chances of it verifying are so small? Five days is even pushing it for accurate forecasts these days with the models. We might as well throw darts at a weather map on the wall.

 

Having models and ensembles run out to 15 days or so can be useful in showing the general trends of the atmosphere.  Pinpointing exact storm chances/tracks/precip types, et. al. is going to be fruitless for many years to come in that range.  I think part of the problem is, when we have nothing to discuss within 5 days, we turn to the fantasy 10 day+ time frame.  Then, some of us (not saying you) get mad at the models for being inaccurate and get mad at mets for not mentioning the storm chances and get all disappointed because the models showed a great storm that really didn't make much sense in the first place due to the general pattern.

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It's not an issue of the models being bad, it's an issue of data ingestion.  The models work fantastically, but they don't receive enough data.  Brad P had a nice post on this recently.  Until we can sample the atmosphere at each and every cubic inch in each and every layer, we will not get extremely accurate predictions multiple days in advance.  Meteorology is not fortune-telling.  It will continue to be an inexact science for years to come, and it would behoove us all to come to grips with that, rather than complaining ad infinitum.

 

Good post.  I really just don't get the expectations sometimes.

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As expected the models have converged of some sort of inland track.  The big ridge over the NE is about the worst thing you can have for wanting a winter storm.  But after this things improve by day 8+ and the pv starts to shift east and we get some nice blocking over the top.  Not a bad overrunning pattern, just need some luck.

 

 

 

 

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post-2311-0-90766100-1455902939_thumb.pn

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As expected the models have converged of some sort of inland track. The big ridge over the NE is about the worst thing you can have for wanting a winter storm. But after this things improve by day 8+ and the pv starts to shift east and we get some nice blocking over the top. Not a bad overrunning pattern, just need some luck.

what's this "overrunning pattern" you speak of? Only types of storms anymore are cutters or Miller b's
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As expected the models have converged of some sort of inland track. The big ridge over the NE is about the worst thing you can have for wanting a winter storm. But after this things improve by day 8+ and the pv starts to shift east and we get some nice blocking over the top. Not a bad overrunning pattern, just need some luck.

what's this "overrunning pattern" you speak of? Only types of storms anymore are cutters or Miller b's
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