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Holston_River_Rambler

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Posts posted by Holston_River_Rambler

  1. I don't know, I'm kind of in a delayed, but not denied state of mind (á la Carver I think)  when it comes to this epic pattern some folks in the MA and on southernwx have been honking about. 

    I still think the "Whirlpool of Death" we've been stuck in, in phase 7 of the MJO, is throwing long range modeling for a loop. 

    9cC2ylj.png

     

    If I had to draw an image up today of how I might predict the MJO RMM plots to full out until the end of March, it would look like this:

    Blue is February and red is March. 

     

    5dqvqOl.png

     

     

     

    If I had to cite any evidence, I would use the 1 and 2 week verification of the GFS

    one week:

    vDwSKWu.png

     

    two week:

    m9DSmDJ.png

     

    Models have consistently tried to kill off the wave (as other have often noted), but it has REALLY gotten bogged down in the western Pac this time. 

    The other wild card is the SSW. Last time we had one in mid Feb it just made for an absolutely brutal spring. Late season freezes, but never cold enough for snow. That was a moderate La Nina though, so I'll withhold judgment about how this constructively or destructively interferes with the pattern until mid March. 

    If all else fails we have the Raindancewx model. Once again, despite his abrasive demeanor, he has done a better job than many of the other long range folks, at least in the Americanwx El Nino thread. He's calling for a repeat of our ("fluky" as he called it) Jan snow around March 1 and then a cold and stormy March, a combo of 73, 83, and 98. Specifically he used the March 1983 snow in the south, but offset a couple of hundred miles NW, which puts the southern Apps and east TN in the crosshairs. It also looks like there was one in March 1998, but I'm going to have to play around with old radar data to make sure it is the one I'm thinking about. 

    Eventually these Pac jet extensions have to end or at least let up, right? I remember several people (grit/ webb/ 40/70) were speculating this one might not be as bad as the one in Dec, but heck, I think this one has ended up worse. 

     

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  2. Just as a comparison, here is the Himawari imagery from the time of SSW in 2019:

    9FN9lVw.png

     

    Here is todays:

    LkVVSud.png

    Thoughts?  (apologies for one being visible and one being infrared, I could only see visible imagery for the historic database)

    For me they do look somewhat similar, but remember that the SSW in 2019 was happening in the visible image, we still have a couple of weeks, if it does happen. 

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  3. Actually just went back to Jan 2019 discussion and found this (image is a screenshot, post was from Eric Webb):

    1nLCjYC.png

     

    I think we chased the pattern for all of January and finally got the Dayton leeside micro low "revenge of the strat storm" that gave Blount and Sevier counties a few inches, but that was it. 

     

     

     

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  4. 2 hours ago, tnweathernut said:

    Not trying to be a wet blanket, but does anyone remember the year where there was almost complete agreement we were headed toward a great pattern.  Almost all ensembles were pointing toward it, and I think we were fringe OP range.  Then, a SSW occurred and modeling did a 180.  I don't remember the year, but I remember having a very different view of SSW's the year that happened.

    It's def. a concern. 

    I think it was the event of Jan 2019. It happened during a weak El Nino, while the convection was over the MC and looked to maybe make it to the centra Pac.  I think I remember you even said something like "I'm starting to hate poorly placed tropical convection." 

    Best case scenario for this one is it transpires while the MJO is in the Eastern Pac/ western hemisphere and reinforces that. Sometimes these will reenforce tropical convection wherever it is at the time of a warming because the strat over the tropics tends to cool and enable convection there, while the pole warms. 

    If this one happens, it is happening about the same time as the one in 2018 that just made a miserable spring. We got plenty of blocking, about 20 or so days later, but it was too late. 

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  5. 15 hours ago, weathertree4u2 said:

    my bigger concern is that we seem to be back into the pattern of a few days of rain then two weeks without rain. Any ideas when it might be different? Anybody? 

    I think we'll be ok, once we get out of this tropical forcing limbo we've been in for the past couple of weeks with the MJO loop in 6/7. 

     

    As for other long range thoughts (not directly related to weathertree's question) this AM, the SOI 30 day average is now consistently falling.

    4DDQg77.png

     

    I like to see the average tank, even more than big one day drops. Something bigger picture is going on then, IMO. Not going to worry much about the MJO until we get some looks that get us out of 6/7 loop purgatory. 

     

    Another thing that some folks have been noticing is the SPV. Honestly, I kind of stopped looking since we had the earlier snow in mid range, but it looks like the SPV is going for a SSW again toward the third week of Feb. 

     

    giphy.gif

     

     

     

    Here is the full tour of the GFS long range projection for the polar domain 10, 30, and 50 mb; temp anomalies and then height anomalies:

    giphy.gif

    That is hands down the best looking attack on the SPV on all strat. levels I've seen this year. Could make for a cool wet spring if that happens. 

     

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  6. Here we have it again at 6z:

    6tCQVzz.png

     

    Plenty of shortwaves upstream NW/ W/ and SW:

    EksWn4N.png

     

    Not identical, but similar to 12z and 18z yesterday:

    iiK1IhW.png

    dg2gjDo.png

     

     

    But notably not 0z overnight.

    I mean don't know, what are the odds that a randomized model spits out a similar solution at 384 hours, especially after having a run that doesn't look quite the same and one run that looks totally different. 

     

    I know, I know.

    But let's see over the coming days if there is something about the upcoming pattern that favors such an outcome. Wouldn't be surprised to see it pushed back by a few days, or if the trough ends up further west, but what I am looking for is consistency at this range. 

    Just so I don't seem too weenyish, the Euro control looks different:

    qWBMd1S.png

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