Jump to content

Carvers Gap

Members
 View Profile  See their activity

  • Posts

    16,111

  • Joined

  • Last visited

 Content Type 

Everything posted by Carvers Gap

  1. Carvers Gap
    One rule of thumb is that clippers really like to pull north as the event gets closer. There are certainly notable exceptions to the rule, but normally we want that clipper going well south.
  2. Carvers Gap
    Yeah, good find. When the EPS is cold after d10, that would likely verify much colder if true. BN temps in Jan are cold! Certainly looks like the strat stuff is showing up. Modeling has a tendency to change quite quickly once those effects get to our latitude. Guessing this is as a result of the early Jan SSW but not certain. I “think” there is another perturbation(think that is a word?) later this month, so modeling could be sensing that. But with the GFS last week really getting this cold back into Canada, makes me think this is due to the early Jan SSW. With such a sudden reversal in the lower 48, really seems like SSW stuff...now, let’s just hope this stuff doesn’t hold in the West like what occurred in Nov. I think this time around the -NAO likely forces the flow into the East this time after if first ventures into the West.
  3. Carvers Gap
    The GEFS Extended from yesterday shows the reversal which is modeled to occur over Canada. This reversal has been accurately modeled for a couple of weeks. The cold lifted out of Canada last weekend, but check this out. First image is the 13-20th. Second image is 24-31st. Very cold air spills into western Canada. I think Holston's SSW previous discussions have merit. If those two maps verify, IMHO that is the direct result of the SSW. I am seeing ensembles move to this look at 12z today, especially the GEPS and GEFS. The SSW has basically displaced lots of cold off the pole. I agree with John that the NAO is likely being augmented by the strat stuff. Modeling has been trending towards this look for about the past 36 hours.
  4. Carvers Gap
    I don't consider the 12z GEFS and 12z GEPS ensembles to be particularly warm. Additionally, the 12z EPS has adjusted post 300 towards the GEFS. The ridge which was setting up shop in the East in the LR(on modeling a few days ago and had been a mainstay for several days) is now projected to retrograde into the Southwest and create a very typical Nina pattern with cold stretching from Calgary to the TN Valley region. That ridge at one point was set to connect with the NAO and be quite strong. Then, it was going to retrograde into the West, but come back East. As it is right now, we may bet backdoored with BN heights coming in from the Atlantic of all places as the pattern continues to retrograde at our latitude. While our weather is coming from the west obviously, the 500 pattern is quite another setup altogether. IMHO, this is potentially setting up concern for an ice storm due to overrunning. Basically, the cold will periodically surge into this area. With an active southern jet, the cold will potentially get trapped at some point as WAA overruns it. You can see very clearly that the 12z Euro operational almost does this. That has a lot of 95-96 in it. So, interesting to see modeling yet again pushing back a warm pattern. BTW, the MJO continues to look better today. IF the Pacific can be of any support, the East will get cold very quickly as it appears cold is now modeled to enter into western Canada and spread eastward. The 12z GEFS is a great illustration of this. Of course, we could get some unwanted Pac air at times, but I would suggest that our source region for cold is about to be quiet cold. I echo Met85 from the SE forum, great discussion.
  5. Carvers Gap
    The real question in my mind is how far does the cold push. A great example is to look at the 6z GEFS and 0z GEPS temp anomalies. Both have a classic La Nina cold set up. One pushes the cold into the SE and one does not. I suspect we see a blend of those two models.
  6. Carvers Gap
    Not sure that the pattern simply doesn't revert back to the pattern that we had during the last 1/3 of December. During years where La Nina winters are cold(there are some warm ones as well if the Nina is moderate to strong), the cold stretches from the Mountain West to the southern Apps and/or MidWest. Starting to see the end of the month ridge get pushed back - no surprise. I think right now we have an unfavorable Pacific battling the NAO. So far, that has produced four sub-forum events since early December. I have no crystal ball, but I suspect we continue to see chances through at least the first week of Feb. Interestingly, wx Modeling actually has been correct about the warm-up which was predicted for January. TRI is a whopping +4.2F for the month so far and only two days with BN temps. That said, Kingsport has received roughly 4" of snow during that time frame. That is what a -NAO does, even if it doesn't have a ton of cold. NAOs often produce the right confluence combination here. It is almost as if 89-90 and 95-96 are battling it out. As Holston noted, we should be cautious in embracing any dry spell. It may happen, but when modeling shows abundant cold with no precip - very unlikely that combination occurs due to a very active precip pattern. Pretty much each time that we have seen a cold front, frozen precip has followed. So, I think the key is to identify cold air(even if marginal). That cold, in conjunction with a very active southern stream, has the potential to produce wintery precip for the area. Some years we get cold, and don't have an active southern stream...hence the phrase cold and dry. This year just seems the potential for cold and precip to merge is much higher. That is likely due to the NAO slowing systems down over this region.
  7. Carvers Gap
    It has been my observation that when a bunch of weak systems are running around, models tend to miss phases/partial phases at the 6-7 day range. Wouldn't be surprised to see a model grab one of those pieces of energy, and spin it up.
  8. Carvers Gap
    Basically just an issue of missing a phase at 7 days out....highly doubt the timing is down on that. Door is open around the 19th it appears.
  9. Carvers Gap
    12z GFS and CMC definitely support potential and fountain's post above. Lost of energy ducking under our latitude.
  10. Carvers Gap
    Logged in 1/2” of snow here. Nice surprise.
  11. Carvers Gap
    Snowing here.
  12. Carvers Gap
    The -NAO is going to battle a very bad Pacific set-up after the 25th it appears. Again, let's see how this plays out....lots of time between then and now.
  13. Carvers Gap
    18z GEFS looks less appealing. The GEFS extended, which runs once per day, looks very good even if the 500 pattern gets sketch after Jan 30th. Cold at the surface undercuts the ridge in the East.
  14. Carvers Gap
    I think the cold looks to be working to this side of the hemisphere by later this month....looks like it dumps west first. Question is, "How far will it spread eastward?" During cold La Nina winters the cold spreads from the Rockies SE to the TN Valley area. Some years it doesn't get that push. With the SSW occurring now every two weeks or so, modeling is going to be all over the place. Pretty clear signal that the trough will retrograde into the west around the 23-25th. Again, does it spread eastward and undercut the ridge at 500. Until then, I think we have a couple of very chilly weeks.
  15. Carvers Gap
    MJO looks a lot better today on most modeling.
  16. Carvers Gap
    The 12z GEFS is an absolutely stellar look at 500....just wanted to say that again.
  17. Carvers Gap
    Simply beautiful runs of the 12z GFS and GEFS.
  18. Carvers Gap
    And the 18z NAM at range only has temps in the low to mid 30s as precip gets into the eastern valley, including Chattanooga. Take with a huge grain that far out, but those temps are not warm. NAM was flirting with more wintry stuff even outside of western TN and MS.
  19. Carvers Gap
    Just digging through the 12z CMC it had temps at 35 during the heaviest of rain in the Central Valley.
  20. Carvers Gap
    As a matter of fact, almost the entire region is barely above freezing on the RGEM. WAA may scour that out...but it looks like that return flow has passed to our east east, because the low goes to our southeast - meaning that the warm nose would be limited on that particular model run. Just toggle to temps and look on TT. That is like the coldest possible rain without ZR or SN.
  21. Carvers Gap
    The temperature in Knoxville is 33F at 84 on the 18z RGEM with rain moving in over the top. Dropped 2 degrees as precip started on that model.
  22. Carvers Gap
    18z RGEM looked pretty good for western areas of the forum - I agree. Also, it had a bit of an icy look on the northern fringe. Think maybe it was tnweathernut who said he thought the high over the top would have trouble moving. Ice stuff here is often very tough for modeling to pick-up on. Almost always occurs when WAA gets over the top of cold valley locations. Not saying that happens, but seeing the RGEM hint at that made my power lines shiver.
  23. Carvers Gap
    Was looking a bit more closely...looks like that storm is really affected by time of day. I like that track quite a bit. Just going to have to watch it.
  24. Carvers Gap
    Interesting discussion by Joe D'Aleo today about the lack of airplane data, specifically less data about jet streams. This is nothing new, but he floated the idea that some of the bouncing around of modeling at LR may well be to lack of sample data. He did note that the Euro takes the cold from the strat split to Asia, and the American/Canadian models now bring it to NA. This creates a much different look over NA after the 20th. Now, it is still entirely possible the mother load of the cold stuff is going to dump into the West - can find very few LR models that show it make inroads into the East. However, though 500 maps like like poo, the actual surface maps are much colder between the MS River and the spine of the Apps - speaking after d10. If a piece of the TPV drops into southern Canada, which I actually think is likely(I like the GFS with strat splits), then that cold may well push eastward and fight the SER shown on most modeling. Anyway, just going to close by re-iterating that we may be lacking some of our normal data which drives modeling...and is causing some wider than normal variation. That may well be contributing to models taking a longer than normal time to hone-in on a solution with winter storms. Of note, like John, I feel the Canadian has done remarkable well with both short, medium, and LR work. I think the chances for a major winter storm along the EC are increasing as the cold drops south and interacts with a ridge that will allow storms to climb along the EC.
  25. Carvers Gap
    Kingsport called school today(crazy since were are on virtual, right?). So, I have some time to catchup on modeling. Was barely able to track this last system - had somebody keeping me up to date. Wasn't able to catch-up until last night.
×
×
  • Create New...