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jm1220

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Everything posted by jm1220

  1. jm1220
    Not a surprise. A degree or two at 750-800 mb makes all the difference for many around the city and coastal areas.
  2. jm1220
    That’s essentially right outside DC near Arlington. They were expected to get maybe an inch or two there. We’re expecting (NYC anyway) about as much as far NW corner of VA and places like Hagerstown or Frederick MD.
  3. jm1220
    FWIW the “wall” of heavy snow we need is setting up pretty well down in MD and VA.
  4. jm1220
    They tend to be over amped further out and more accurate closer in.
  5. jm1220
    ? Never even heard of that one, where does it come from?
  6. jm1220
    I’ve been looking at soundings on the Nam, the warm air tries to come in early but the snow rates and lifting keep it away until they go by. That’s really the key.
  7. jm1220
    I wasn’t at home in Long Beach at the time but I was told there was a lot of freezing rain there. Guess the cold air was thicker further north on the island and there was sleet.
  8. jm1220
    Has to be for 3 consecutive hours-blizzard conditions. The worst of the winds may be at the same time there’s a dryslot close by or mixing, and worst of the winds will be on Long Island. If I was them I wouldn’t do so but there could be those conditions for some period of time.
  9. jm1220
    Yes I was living in State College at the time (2007). Was snowing light there all day, then around dusk moderate to heavy. An hour later the flakes became gigantic and minutes later heavy sleet with temps in the low teens. It was brutal outside and infuriating since the snow was really starting to pile up. The storm ended with a few hours of a real CCB there and 10-11” of quicksand like snow/garbage that froze solid. Much of PA was shut down from that storm.
  10. jm1220
    Sleet is annoying at the time but it also helps retain the snow pack for longer. Makes it much denser and freezes it solid. And yes just as slick to drive on etc as snow, just doesn't pile up nearly as fast. Sleet is 3:1 liquid ratio.
  11. jm1220
    Here's the dual-pol radar site which we'll be praying to, bargaining with, pleading to, cursing at, etc tonight sometime around NYC. Bookmark it and the game is that we avoid the yellow sleet line as long as we can. Yellow line-evil. COD NEXRAD: DIX
  12. jm1220
    Off to the races in State College. STATE COLLEGE PA / PENN STATE Webcams & Traffic Cameras (williamrusk.com) Good luck to all!
  13. jm1220
    The high doesn’t mean much for how far the sleet advances. Those are mid level lows which determine that.
  14. jm1220
    We’re not as interested in the surface low track in this case as the mid level lows. Notice the sleet expanded inland into PA? That could be due to more aggressive mid level warming.
  15. jm1220
    If that fronto band on the Nam is real, we’ll have huge snow rates under it, probably 3” per hour. It seems to last 2-3 hours under any location.
  16. jm1220
    The mesoscale models like the Nam should capture the warm air aloft better, although the Euro’s resolution should also allow it to be captured I’d think. But I’ve seen it be too cold before in a couple of storms in 2017-18. This could be different? The NAM has a lousy evolution for the 700mb low which allows warm air to get as far north aloft as it does. I’m not sure what the Euro does with it.
  17. jm1220
    Finally got rid of that crazy coastal precip max thing but has a nice CCB headed east. The 700 and 850 low tracks actually aren't horrible on the GFS. The close surface low tries to flip the south shore to rain for a time (Atlantic City at 6z makes it to the mid 50s almost), still not much mid level warming here (I believe the NAM much more on that).
  18. jm1220
    This would absolutely indicate huge snow rates where this purple fronto band is located. Not sure how long it'll be in one place but it'll be coming down like crazy there. This is 3z tomorrow (10pm tonight)
  19. jm1220
    If the NAM is right the sleet may get up to around I-78 before hitting a wall there for a while in the heavy rates, and maybe hug the extreme south shore of LI. We'll see how it plays.
  20. jm1220
    I'm thinking 6-9" for us, staying a little conservative. Maybe too much South Shore left in me. We'll need the heavy snow rates initially to hold off the warm air aloft. It can definitely happen but I think Upton's a little too high and the Euro too cold. Other areas: NJ shore less than 1" most places-NE winds off warm water are a killer. South Shore: 3-6", maybe 2-3" twin forks, also I-95 south of I-78 such as Trenton. Sleet comes in earlier here obviously and you deal with the ocean influence too so possibly some rain especially out east. Minor additional accum from CCB remnants. North Shore out to Wading River area and most of NYC: 6-9", more of the initial thump is snow, changes to sleet at the end of it. Freezes into cement after storm leaves and CCB remnant drops maybe 1-3" additional. Also 6-9" for I-78 corridor to PA border, 25 miles or more NW of I-95 Coastal CT, Westchester/Rockland, NJ I-80 and north 9-14", mostly snow with a little sleet possible at the closest the storm comes. Dryslot keeps amounts lower than further north. Orange, Putnam south of I-84, more than 25 miles away from CT coast, Sussex County NJ 14-18", all snow. Also dryslot may reach this area somewhat. Catskills, Poconos, I-84 corridor and north: 18-24" from deformation snow band and high ratios.
  21. jm1220
    The sleet gets held off for a while due to huge lift and heavy rates. Warm air comes in as the front end slows. 3k Nam has up to an inch liquid fallen already before 6z at Farmingdale. We’ll need it down here to overcome the southerly flow aloft.
  22. jm1220
    That being said it's a step back on the NAM-more amped with the 700 low track for sure. Tracks from around Allentown through CT. Hopefully it's wrong. I'd think warm air aloft would come in stronger and risk a good chunk of the front end being sleet (for near the city and LI). Just checked sounding for around Farmingdale-very marginal for most of the front end. Sleet gets into much of NJ at some point and even the Allentown area. The model thinks the precip rate can overcome the warming aloft but just barely. It's a little too cold and much of the front end can be sleet.
  23. jm1220
    It must think the lift/precip rate can overcome it for a time? I can see it happen if it really comes in like a wall.
  24. jm1220
    I think it’s really how long we can hold off the warming aloft in the heavy snow push. If that surges through the NYC area early obviously totals will be low but if it can be held off maybe we can make it to 10”.
  25. jm1220
    Might mean no rain but it doesn’t say much if anything about sleet. That’s determined by mid level temps and conditions not surface.
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