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Winter 2014-2015 Pattern Discussion Thread III


BIG FROSTY

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Anytime the train is running just to the south, with super cold on top of us, there's chances.  I love this pattern.  I hope it goes the rest of the winter :)  I've had several virga bursts, and like with smoke and fire, where there's virga, there's moisture, lol.  I think we'll get some ice, or something down here on the southside with that rain running under us like this.  Just need the wet part to move up a bit higher, and it will if the precip increases :) Just need that cold to erode slowly.  Tony

I agree...I can see that as well

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00z GFS wet with Sun-Mon system, monster 1047 high in plains Monday , maybe setting stage for Wednesday !?

 

There's a weak lead wave in the subtropical jet that runs into the damming high producing some light icing Tues night into Wed morning.  Looks like the GFS is up to its antics again of shearing out the main wave in the southwest states.

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There's a weak lead wave in the subtropical jet that runs into the damming high producing some light icing Tues night into Wed morning.  Looks like the GFS is up to its antics again of shearing out the main wave in the southwest states.

It's not a bad system on the GFS, it really phases nicely, cuts off eventually once it's past us. I would like to see what would happen if it ejects everything and the phase was quicker....wish casting FTW.

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Low track looks good, no high to be found though! And I think number 1 will happen!

Snowcover for the win!

It's not a bad system on the GFS, it really phases nicely, cuts off eventually once it's past us. I would like to see what would happen if it ejects everything and the phase was quicker....wish casting FTW.

 

I'm curious about the lead wave scenario of precip streaming out ahead of the main wave in the southwest flow and into the damming high for Tues-Wed. The models aren't keying on that too much, but it's something to watch.

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It's not a bad system on the GFS, it really phases nicely, cuts off eventually once it's past us. I would like to see what would happen if it ejects everything and the phase was quicker....wish casting FTW.

Why do we not think the surface will be colder than it's showing now? These things usually turn out colder.

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Why do we not think the surface will be colder than it's showing now? These things usually turn out colder.

 

That's your expertise Cold Rain, preach it!  I don't know, I just tend to really question cold air supply in these parts after a lifetime of temp fails....I don't question it for Tues-Wed though if there is precip...solid damming setup then.

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Yeah, the HP is pulling out as our storm is moving in.  If the HP moves out slower or the storm moves in faster, we would be in better shape.  As is, there might be some in-situ CAD, but that won't keep you below freezing very long usually.  I guess we'd be better off with a stronger LP at this point to hopefully pull some colder air down as it rounds the bend, but I'm not sure really.

 

I can absolutely buy low to mid 30s with rain.  It happens a lot in CAD-land.

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Yeah, the HP is pulling out as our storm is moving in.  If the HP moves out slower or the storm moves in faster, we would be in better shape.  As is, there might be some in-situ CAD, but that won't keep you below freezing very long usually.  I guess we'd be better off with a stronger LP at this point to hopefully pull some colder air down as it rounds the bend, but I'm not sure really.

 

I can absolutely buy low to mid 30s with rain.  It happens a lot in CAD-land.

Cutoff FTW.

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Can it get worse? Not much worse than it shows, LOL.

 

I don't know... I guess it could be a warmer rain... though that's not necessarily worse.

 

The Para and old GFS actually handle the system pretty differently.  The Para slides basically eastward out to sea whereas the old GFS rounds the bend some.  The 18z Para did round the bend, so I'm not sure if it's just a blip or a bad trend.

 

I'm just having a hard time getting on board, even with the EPS screaming for it.

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I don't know... I guess it could be a warmer rain... though that's not necessarily worse.

 

The Para and old GFS actually handle the system pretty differently.  The Para slides basically eastward out to sea whereas the old GFS rounds the bend some.  The 18z Para did round the bend, so I'm not sure if it's just a blip or a bad trend.

And to think, next week at this time it will only be the Para. I already miss the old GFS.

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That's your expertise Cold Rain, preach it! I don't know, I just tend to really question cold air supply in these parts after a lifetime of temp fails....I don't question it for Tues-Wed though if there is precip...solid damming setup then.

Yeah, I hear ya....I'm not looking at the data right now. But if the damming is solid, temps will be too warm at this range. If it's insitu or not strong, then yeah, 35 and rain it is. Guess we'll have to wait longer and see which scenario we're dealing with.

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And to think, next week at this time it will only be the Para. I already miss the old GFS.

 

One good thing is that we can start making up new, fictitious biases for the Para to wishcast storms in the medium range.

 

The 18z NAVGEM was looking pretty terrible, not that anyone cares and like it matters at all.

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BTW, the French site that has the fastest GGEM maps now has the maps available for North America specifically.  This is very nice as you used to have to look at the entire Northern Hemisphere to see our neck of the woods, which was a PITA.  Meteociel always has the maps for the GGEM and the UKMET faster than anywhere else I've seen by quite a bit.

 

http://www.meteociel.fr/modeles/geme_cartes.php?ech=6&code=0&mode=0&carte=3&archive=0

 

The maps are kind of lousy, but they're definitely better than those awful black-and-white maps that the GGEM has.

 

It also has maps for the GFS, Euro, etc.

 

It looks like the GGEM is going to at least give us a storm this run, which is more than past runs had (dry).

 

EDIT: well, it's marginally better, but it still is pretty much nothing.

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The 11-15 GFS continues to look nice with a combo of the return of W ridging and increased upper lat. blocking. By that time, models suggest that the MJO may be in the favorable phases near or within the COD. Keep in mind that climo for late Jan. sees an increase in major wintry precip. frequency. As a result of all of this, we may very well be finally seeing an exciting pattern starting within about the next two weeks. Keep watching the GEFS day 10 AO prog as it has had a high correlation to reality. The weak Niño -high end neutral pos./strong +PDO will hopefully finally start paying off with wintry in addition to strong cold. There's no need to dwell on negativity so relatively early in the active wintry part of the season IMO. The lack of sig wintry precip to this point outside of 11/1 has a low correlation to the prospects for sig wintry precip for the rest of winter. I'm sure Webber will agree with this. Climo definitely says this.

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The GEFS still suggests the AO will likely plunge into negative territory after about day 10. We'll see. The correlation through day 10 has been good but the day 14 corr. is quite low. Day 10 mean is still modestly + but then it plunges just afterward to -. It seems to be moving up in time:

http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/ao.sprd2.gif

The NAO is fcast to get down to a modest positive but not get down to 0 at least through day 14:

http://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/nao.sprd2.gif

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