Jump to content

BlizzardWx

Meteorologist
 View Profile  See their activity

  • Posts

    438

  • Joined

  • Last visited

About BlizzardWx

Profile Information

  • Four Letter Airport Code For Weather Obs (Such as KDCA)
    KTUL
  • Gender
    Male
  • Location:
    Tulsa Oklahoma

Recent Profile Visitors

3,269 profile views
  1. BlizzardWx
    For all the talk of the arctic being cold, the sea ice hasn't got the memo, running near record lows. What I suspect, if the "cold" pattern continues, is that this will slow down heading into peak summer melt season like we've seen in the last few years. So we end up low, but not record low. On the other hand if melt off continues it would be yet another sign that something has indeed shifted.
  2. BlizzardWx
    I think extra cloud cover from more open sea area and thus evaporation is a good candidate. But its also plausible it could be traced back to the same patterns driving the west Pacific warm pool/-PDO that has been dominant over most of this same period. Interesting to think about anyway. I am not totally sure we cool that area below 30C but it is possible. Perhaps more likely is if the area to the east is enough warmer, along with the circulation you mentioned, it can at least put a lid on convection near the MC. Then you'd at least have the dominant forcing away from 4-5-6.
  3. BlizzardWx
    I think it IS pretty good right now for the most part. But I also think as the globe warms it will rise. It's really a function of lapse rates and a 30C surface is usually good enough to guarantee conditional instability for the time. But this ties back to my other post that a robust +IOD and +ENSO circulation could still cap it.
  4. BlizzardWx
    That is the question! I hope we can do it but I am still on the fence about whether it happens or not.
  5. BlizzardWx
    Yeah that is exactly what I was getting at. I am not sure if +30C is a magic number per say, as strong enough subsidence from a +IOD and +ENSO circulation might be able to keep a lid on it. But I do think the general idea is correct that if the surface is warm enough you will still get storm activity and forcing from that area.
  6. BlizzardWx
    If the entire system is too warm, even "below normal" can still be warm enough for convection to form. I tend to think that is what actually matters. If storms are popping near to above normal frequency near the MC you still have forcing.
  7. BlizzardWx
    My numbers run slightly higher than WCS, and showing a rise back to around 0. Last year at this time we were tanking the value. In 2024 we were recovering somewhat after already tanking, but values were still much lower than now. In my mind its clear that things are really changing from where we've been the last 10 years. Yeah, maybe we aren't headed for a robust +PDO, but it feels like neutral to slightly positive could be in the cards.
  8. BlizzardWx
    This is a good point because it may well be pretty similar to what we end up doing in the N Pac this winter, with warm water east of Japan AND along the west coast. Yeah its a problem when we only want to use recent years as analogs yet all of those years are biased towards -PDO and +AMO. That won't work when we buck the trend.
  9. BlizzardWx
    And it's worth noting it's not just really warm vs less warm. ECMWF seasonal shows genuine cool anomalies near the MC as part of that +IOD along with the eastward leaning nino. I think if this roughly happens it really would kill the split forcing Bluewave is always talking about. Even further north the ECMWF seasonal is mostly breaking down the warm water in the west Pacific with what is a neutral to maybe slight +PDO look. This would be a genuine change from the last decade. And that's to say nothing of what still looks to be a marginally negative AMO.
  10. BlizzardWx
    Yeah, that is what my page shows as of the 27th for the daily value. As for how I did it, that's an important point to dwell on for any PDO calculation. It's dependent on the period of record, the exact domain, how much you correct the climate change signal, etc. All of these effect the EOF calculation that defines the weights that can then be used in the actual calculation. None of this is clearly standardized anywhere, which is why different groups get different values. I think that mine and WCS are better than NOAA who does not appear to have detrended the climate change signal properly.
  11. BlizzardWx
    My calculation has -1.18 for the PDO, so at least relatively in line with WCS. It's definitely been dropping the last few weeks. But the AMO is looking solidly negative now, so that is new compared to recent history.
  12. BlizzardWx
    The last few years we've done that mid summer PDO nosedive. I think that will be an early clue for this winter for what path we are on. If we can avoid driving off the PDO cliff maybe things really are changing. This is definitely what we want to see. After a decade of anomalous warmth its going to take some work to clear that heat out, but we should make a good dent if the WWBs and KWs continue. I hope we can get plenty of recurving typhoons this summer and fall to eat up the warmth further north too.
  13. BlizzardWx
    You are right that it should be that way, but my suspicion is that the NOAA numbers are so low because its imbalanced. But yes, I don't know that, just a theory.
  14. BlizzardWx
    One thing to keep in mind with the PDO is that depending on how you calculate it, it's not necessarily balanced. By that I mean that the main area east of Japan, depending on how you calculate it, can be both larger in area and have a stronger weighting than the half ring around it. This matters, particularly in a warming climate. As warm conditions everywhere can bias the PDO calculation negative for these reasons. In fact I think this already happens with the NOAA calculation. My page and the WCS seem to handle this a bit better but likely not adequately. @bluewavehas talked about how the PDO is becoming less useful with time and this is part of the reason why.
  15. BlizzardWx
    If the west Pacific is able to have a sustained active season, particularly into the fall, frequent typhoon recurves may help to break up the warm water anomalies over there. Perhaps it would help in nudging us towards a +PDO. I guess we will see though.
×
×
  • Create New...