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high risk

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Everything posted by high risk

  1. high risk
    I can't argue with this thinking, and it seems like the 18Z NAM is moving towards that idea.
  2. high risk
    The 18Z HRRR laughs at our thread
  3. high risk
    FWIW, and I say this with every caveat about no two events being the same, the ARW and ARW2 Hi-Res Windows were the coldest (and most erroneously cold) models for the January 20 rush hour bust. The GFS and Hi-Res Window FV3 were the next coldest. NAM and NAM Nest were next "best" but still a bit cold. The Canadian models did the best. Again, it was a single case, but it did involve shallow cold air spilling into the area.
  4. high risk
    Oh, F*ck yes!
  5. high risk
    Way more SREF information than anyone ever wanted or needed, but in addition to initial condition differences, the members are comprised of two different cores, and there are some other physics differences too. And one of those model cores is a system that has mostly been retired, so as noted, it's very much an outdated system.
  6. high risk
    I'm really surprised by what I've seen from the guidance so far today, as while the GFS is documented to do a poor job with shallow cold air masses, it's usually *slow* to bring them in. Seeing the GFS be faster than other guidance with the arrival of the cold into our area is not what I expected to see. The bottom line is that I need to see another model show the same idea before I'm going to get anything close to being on board.
  7. high risk
    I lean towards lower totals in the jackpot zone too, but as some of the cooler heads (or major weenies) have noted in that discussion, there was a storm in 2015 (I think) where the models kept the huge snows out of southeast New England despite an amazing look at h5, and they ended up getting crushed.
  8. high risk
    H5 looks super, but several models show a bit of a strung-out mess at the surface. The New England forum is freaking out.
  9. high risk
    edit: and "looks great" should have been "looks improved with the front end snow" and of course, the Nest doesn't look as good.
  10. high risk
    NAM parent looks great with the snow, but temps are above freezing until early evening, so it might struggle to accumulate during the daylight hours.
  11. high risk
    As we try to sort through all of the disagreement between the models, one thing that stands out to me is how much the GFS and NAM Nest agree on the precip field. I have no idea how this is going to play out, when the NAM and GFS disagree, but the NAM Nest is close to the GFS, I take notice.
  12. high risk
    or not.....
  13. high risk
    18Z GFS looks much different than the 18Z NAM that had us throwing ourselves over the cliff last hour. Stronger, more phased wave and higher heights out front. Not saying that this will put the coastal low in a favorable spot for us, but it should hopefully retain our Friday evening/night snow here.
  14. high risk
    Perhaps, but guidance has us getting to the upper 30s during Friday and only falling back to around freezing for the evening rush. Moderate snow at rush hour will have some impact for sure, but that's not the standard recipe for rush hour disaster here.
  15. high risk
    I'm thoroughly confused, as Pivotal 10:1 has almost 3" on the ground around DCA by 12Z, while TT 10:1 has a small fraction of that. The final totals then of course end up with a big discrepancy. There is a single snowfall field in the GFS (it's a liquid equivalent), so they should in theory be using the same field, applying the same 10:1 SLR, and getting the same result. One of them is doing something funky, and my money is on Pivotal being the goofball.
  16. high risk
    I'm always a big fan of the NAM Nest for this type of event, but it's worth noting that it's a bit later with the changeover than other CAMs, and it's also less aggressive with the temperature crash during and just after the event. Actually, the HiRes Window FV3 is also a bit slower with the change to snow and is a bit closer to the NAM Nest temperatures (although it still drops lower as the event gets cranking). I'm going to watch these details in later CAM runs today.
  17. high risk
    The Kuchera ratios seem a bit generous for an event with marginal temps through a decent depth above the surface. For now, I like a blend of the 10:1 maps with the positive snow depth change; a 1-3 along and northwest of I-95 and 2-4 well north and northwest might work well.
  18. high risk
    Some of that is rain at the start. The HRRR in particular has a couple of rounds of showers ahead of the snow.
  19. high risk
    I would bet my left nut that DC goes above freezing before we do.
  20. high risk
    The NAM for Monday morning shows this: and it's easy to look at that and say "some patchy light snow" in the DC metro area, but the 500 map shows an impressive vort pass right through the area at that time, so this is likely a representation of some heavy convective snow showers.
  21. high risk
    also worth noting that the GFS is considerably warmer at the start of Sunday than most other guidance.
  22. high risk
    The GFS usually underdoes the amount of sleet and freezing rain in the transition zone. It mostly shows rain or snow here in the evening hours, and I don't buy that at all.
  23. high risk
    This is true, but when the GFS and NAM have large synoptic differences at longer ranges, it's not often that the NAM will be correct. It's simply a lot to ask of *any* regional model to nail synoptic details beyond day 2. One the snyoptics align, one should absolutely use the NAM (and preferably the NAM Nest) for temperatures and important mesoscale details.
  24. high risk
    Sort of. I said that the GFS was upgraded early in 2021, while the GEFS was not. So we can therefore not treat the ops GFS as a true control run for the GEFS. As for whether to buy the inland GFS track or the more coastal track of the GEFS mean, I have no idea.
  25. high risk
    NAM has low teens here Saturday night with dew points around 0. GFS keeps a slight northerly component to the sfc winds ahead of the sfc low on Sunday and has a known bias for scouring out low-level cold air too quickly. I don't disagree at all that we'll be able to torch above the ground, taking the current track verbatim, but the surface cold air is not going to give up easily at all.
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