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John1122

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  1. John1122
    Currently 47 degrees and cloudy after a high of 49, several degrees cooler than forecast but possible temps rise as the front approaches.
  2. John1122
    The RGEM is capturing the likely secondary snow better than the GFS/NAM/Euro. The HRRR is capturing it too. The RGEM has been consistent for two days that snow will linger. These major league Arctic airmasses are able to squeeze everything out, the snow growth zone -15c temps get low in the atmosphere and create the snow that falls that doesn't even show up on the radar because it's falling from so low in the atmosphere.
  3. John1122
    After looking at the next day's post on high on LeConte, they ended up with 11 inches. So slightly less than 50 percent of what the 3k was showing. It really keys on higher terrain and just dumps snow on those spots for some reason.
  4. John1122
    JKL disco about the snow showers that follow the frontal precip Thursday night and Christmas day energy.
  5. John1122
    Nashville being in CST almost always is a little later than MRX with disco/storm products.
  6. John1122
    As a rule you can cut the 3k extreme totals by about 60-75 percent. I believe in the last event it showed LeConte with maybe 24 inches and I think they got 6 or 8.
  7. John1122
    Rgem maintains its stance of much more widespread snow vs the far east NAM camp. HRRR has random convective bands that drop 2-4 inch strips if you happen to get one.
  8. John1122
    GFS looks about as bad as the RGEM does good for all except far NE areas. The GFS was slower with the cold and way more progressive with the moisture getting out of dodge than even the NAM.
  9. John1122
    Morristown gets under a particularly aggressive band and goes from 4.9 inches through the first map I posted to 7.2 inches over the course of Christmas day.
  10. John1122
    Frigid by early Christmas morning, RGEM has snow pockets and temps in the low to mid 10s.
  11. John1122
    Through 48 the first wave of snow is in NE Tn and SWVA and the bands of snow showers behind it are starting to get rolling.
  12. John1122
    Pummeling all of East Tennessee by 42. May be it's biggest run yet if the backside stuff is as robust as the last few runs.
  13. John1122
    RGEM is the same as it was at 00z through 06z. Pounding snow across northern Middle. The rain/snow line has just reached mby. It's basically a mirror of the NAM with features, frontal placement, LP placement etc but has a much bigger precip shield on the backside than the NAM.
  14. John1122
    Reading JKL's discussion from yesterday evening, they reason that models are showing way too much accumulation due to warm ground/day time snow falling. That really seems a stretch at this point in the lowest sun angle of winter on what should be a very thickly cloudy day. Also a stretch to say the ground is warm, December has been BN in the area temp wise and lows have been in the 20s multiple days this week and are in the 20s right now, I don't see one warmish day causing the ground temps to shoot up. Snow falling at rates being shown by some models will almost immediately stick and begin to pile up.
  15. John1122
    MRX issues a winter storm watch for the Smokies, NE Tn and SWVA. About what I expected.
  16. John1122
    The 06z 48hr HRRR is similar to the 3k with the banding. It has areas that get 3-4+ inches under what looks almost like convective snow showers while areas on either side of the convective showers get half that or less.
  17. John1122
    3k NAM is faster with the front than the 12k, very aggressive with backside banding that drops strips of heavy snow and also features some freezing rain accumulations along the Plateau but moves the main shield of precip out much faster than the 12k.
  18. John1122
    The NAM is almost the same on it's features for the past 8 runs, but the difference is it doesn't bring the cold air in nearly as fast the last couple of runs. Yesterday's 06z run the changeover line was about 100 miles East of where it is on todays at 1pm Thursday. So where I was getting heavy snow by then with a LP just across the mountain from Greene County, I'm now getting heavy rain with a low in the same spot. That greatly affects snow totals, basically cutting them in half. 1pm Friday on the 06z from 24 hours ago vs 1pm Friday on the 06z that just ran.
  19. John1122
    Basic synopsis: Euro/UKIE furthest east. But the Euro is better for all of the Eastern valley as a whole than the GFS. GFS/NAM/HRRR not as much moisture return. Better for eastern middle Tennessee HRRR and Gfs/NAM far NE areas but not as good as the Euro for Knoxville and south down the 75 corridor. GGem/RGem would be our new best friend if they verify. Big winter storm for the eastern 2/3rds of the forum area.
  20. John1122
    Euro was better for say Knoxville than the GFS. Slower with the cold by a bit and doesn't have the back side energy like the other models. Could be because it's further East with the frontal lp.
  21. John1122
    Euro popped the low a bit earlier. Gonna be big for NE areas most likely. It's on the east side of guidance right now though which is not a common place for it to be.
  22. John1122
    The Canadian just slams the eastern half of the state as Carvers noted. Absolute best case scenario stuff here.
  23. John1122
    Slightly worse than 18z on the GFS. Day before yesterday all the American models had a bad trend and it bounced back, possibly will again or maybe it will get worse. I'd guess we will see changes all the way up until 12z or 18z tomorrow. Maybe even later.
  24. John1122
    Still snowing at hour 60 in parts of the area on the RGEM.
  25. John1122
    RGEM is even further West it looks like. It runs the low entirely up this side of the Apps. Better for Mid state for sure.
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