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wdrag

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Everything posted by wdrag

  1. wdrag
    I'll be keeping this thread active through about 12z Tuesday, with obs for whatever happens this first storm embedded. At about 12z Tuesday, I'll get the OBS thread specific to the 9th-10th started as it is going probably be many pages (flooding rain, damaging wind, maybe front end snow west of I950. This storm as you're probably aware has potential for 2-3" in 12 hours (rain) and melting whatever water equivalent in NJ (mainly I80 south) is going to result in very rapid rises of rivers on the 10th. Looks to me like considerable river flooding of varying magnitude, awaiting reality. Passaic Pine Brook, IF 3" occurs total from these two storms, it goes to MDT flood on the 10th. Some our BOM guidance has 3.5-4" for basins. Not sure if it will be that much but if your sump pump dont work because of power outages... Worthy to monitor. Not Sandy etc but pretty significant.
  2. wdrag
    That in my opinion is correct. Canadian has to be on board for synoptic scale snow.
  3. wdrag
    Lets look at the 00z-06z/5 NAM thermal profiles for NYC. My guess is there will be steady snow much of Sunday NYC-northern Li but melt on pavement and have difficulty accumulating on grass during midday bit its all sub the about temps 32-34 and precip rate. For now I think odds are under 3" CP-northern LI and mostly likely 1/2-2" but I've been wrong before. I dont know if anyone has noticed the cyclic steadiness of EC and GGEM. Now I'm switching down to the HRRR, NAM RGEM.
  4. wdrag
    Watch CMC trends... it tends to run warmer than NAM. HRRR ag 48 hours tends to run warm and then as we trend close toT0 it should cool. Those two models are my overall operational experiences. Stats are helpful...they temper enthusiasm but sample size can also have new contributions that are not in the more plentiful solutions. NBM has been steady through all the recent dailies. Even 18z EC has only 33F NYC Sat night... good VV and timing with the midnight ob might yield an inch Manhattan. Think its going to be interesting NYC and northern LI. Nothing off the table yet...in my mind. I want to see if the 00z/5 12KM can settle on something more reasonable than its 18z predecessor. I'll be sleeping when it comes in.
  5. wdrag
    western USA looks like it wants to seep east. Seems like we have an interesting two months in progress.
  6. wdrag
    No more nail biting there, I don't think. Northern LI-NYC have a hard time with my expectation T-2" due to above freezing temps. You still have hope at the onset 5-9P Sat and Sunday departure 9A-3P. Just have to be realistic. Here's the Blend of models from 2AM today.
  7. wdrag
    18z EPS is within a tenth of an inch on its new qpf for the Sat night -Sunday morning snow storm. I've added an 18z EPS graphic 10 to 1 ratio chance of 4+. While I do not like using 10 to 1 ratio as a first guess... in the all snow region 10 to 1-Kuchera should work but always keeping in mind the base Positive snow depth change. I'll keep pounding this since it's the easiest way to reduce disappointment. For NYC... EPS Positive snow depth change is 2" now...so within there 1-4 bracket. We're still about 72 hour from the start... so I can't say its a lock yet but hope exists for northern and Western LI to break the less than 2" curse.
  8. wdrag
    That's because many are using 10 to 1. That doesn't work well with melting processes. Everyone in the longer range should start with a base of POSITIVE snow depth change. Then you can look at top end of the range with the 10 to 1, if no sleet/rain. Sleet is converted the same way as snow in the 10 to 1 so it biases amounts high along the warmer edge of the snowfall forecast. There will be banding and we can look at that more closely Friday, with greater confidence. I think we'll see clusters of power outages from wet snow and gusty northeast winds 30-40 MPH early Sunday somewhere near I78 if the snowfall there is 4" or more and falling at temps of 32-33F. Otherwise, I kind of think the original plan thread plan still looks reasonable. Impacts will be much more substantial 9th-11th with I think widespread river-small stream flooding up and down the east coast along the I95 corridor from NNJ southward to Philly and down to NC. Some rivers may go into the low end of the major flood category, provided two storm rainfalls exceed 3". This and wind damage potential looks pretty significant across the eastern third of the country for 9th-10th, plus of course 1/2-3" wet snow I95 west to start that second storm. Temps into the 50s on Wednesday the 10th I84 southward will add the snowmelt contribution up here in NJ southeast PA.
  9. wdrag
    You're welcome to chatter here about he 10th, but for sure after the 7th all that belongs in the current two storm thread. I have no plans to start a snow thread for the 13th-15th, until the 10th when we are solely posting damage combo 3" water equivalent snowmelt-rainfall/wind reports in the obs thread for the 9th-10th, that one I'll start the morning of the 9th. For now I'm now seldom commenting on modeling for both these next two storms in the primary 6-7 9-10 thread.
  10. wdrag
    Hi! Haven read anything since last eve... I'm sure there was consternation with the 00z/06z GEFS-GFS. Fortunately the EPS is back up as is the CMCE. No change to my own overall thinking since the thread inception, NYC 1-4" to be further adjusted if needed. Just caught Don's post about rations. Good post. Won't be back to post til sometime this eve. Was on call First Aid driver overnight with two calls. Enjoy as you can what's coming 6-7 (split short waves makes this a 24 hour event instead of one bombing 12 hour storm), 9-10 and now looks more and more 13-14. I know if you dont get 4" of snow, unhappiness. s LI looks worst chance 1". At least this was a tracker. It's coming but exact details of snowfall etc tbd.
  11. wdrag
    well done on the link explaining. Its a good start and should be paid attention to. Available via Pivatol Wx and probably other sources.
  12. wdrag
    For the record nationally: inclusive of our own top 10 wettest Dec, some climate sites top 5. Top 3 warmest. snapshot via CP, EWR, ABE for both temp/qpf vs yearly reality.
  13. wdrag
    Negate should read. Gently
  14. wdrag
    Can’t hope. Just have to work the ensemble pattern and negate smoothing out the cyclic changes. No one has promised more than 1 NYC
  15. wdrag
    Too tough for me. Guess 1-4 for a start. Just no lock. May not know til Friday afternoon
  16. wdrag
    fwiw: BOM has a solid 6-14" inland from I95 for our subforum and by 00z/11 about 4" total qpf. These are significant events coming.. how they play? Don's good severity post will need followup... preferably 530P when all the NWS office collaborative data has been meshed. Cant post again til tonight--- hoping these next two cycles stay the course and don't abruptly corrupt.
  17. wdrag
    Don: could post on severity index. Go for it on updating. I won't recheck til tonight but the probs are up to 40% moderate impact just inland from I95. There will be fluctuations on axis but the I think WPC has defined this reasonably well. I like 5-10 spotty higher in their blues, but we have yet to account for mid level warming...so patience. LI just seems a little warm to me but I could be wrong. For now I think heaviest snow west of I95 and lets hope something sticks in CP. For sure an event is coming, imo (95% chance).
  18. wdrag
    well done imo. We'll see what happens. Tomorrow (2nd) will be D5 for the EC. I still am leery of much snow NYC/LI--- I could easily be wrong. I'm just not confident of PTYPE with general 1000-500 thickness over 540. I may not be able to post again til Tuesday night.
  19. wdrag
    yes, I agree... the only thing I can't count on yet is 8-12 Lehigh Valley... yes on the equiv qpf but am unsure on all snow there. I just checked... 19z BOM is hanging tough on 4-7"axis e PA though NNJ n of I80 to CT and qpf by 00z/1 1of 3-4". We'll see if the magnitudes hold. I wasn't too keen on that AFD. You need to offer guidance for preparations. NHC is ahead of our forecast offices by and large on doing that (my opinion only but not necessarily shared by many) and if we go back to the CPC outlook from last Friday that was posted here... they too offered some info for people who need to think about options (8--12 days in advance, including my own personal work life snow/wind/flooding rains- I work for the county inspecting Guiderails, drain pipes, bridges etc)). A forecaster arbitrarily capping a pop is overriding national center guidance which is 88% for NYC. That sitting on the fence forecast for D6 is eventually going to get AI'd out... models are getting better. I'd say capping a pop is more reasonable when you're on the gradient of much to nil. One of those POPS Sagt night or Sunday has to be higher than 50%. For now, we in the NYC subforum continue in the max storminess axis. Yes this could change... but the longer we stay in this axis, the less chance for a miss. Now its a matter of communicating concerns. There's always a chance of failure but my own choice is try to ballpark potential well in advance, especially if BOM/multi ensemble support. 18z/1 EPS is almost identical to the 12z... if anything slightly flatter with a decent short wave and strong 5H LF quad with jet out across there Carolinas and signs of RRQ support south of Nova Scotia with an 850 low edging ever further north but forming from NJ- eastward. The GEFS is now much sharper and unless the models flatten out in future cycles, I find it hard to believe we will avoid a significant precip event. It's FAST... most of it out of here by 12 or 15z Sunday which means most of this event is 12-18 hours (I think). Failure can occur. I sort of think, if its going to fail, the models will have to make an abrupt shift January 2nd cycles (just like the pre Christmas storm last year when the EC suddenly went inside runner around D6 and stayed there and wiped out a snow event).
  20. wdrag
    Just need to hold all of us accountable. I can't add anything more than what is within the thread. Models are good, but not that good on ptype. When we use 10-1, that's outdated methodology that doesn't really properly baseline accumulation. I always start with positive snow depth change. If you have sleet.... that inflates snow totals considerably. 10 to 1 or Kuchera might be good to communicate when we get within 3 days or so, and you know no mix and temps aob 32 at the surface throughout. Positive snow depth change doesn't do so well, imo, in these 33-34F nighttime heavy wet snows when the snow overcomes melting processes.
  21. wdrag
    Very good post. It’s a matter of reality. Thank you. I think folks need to be aware of potential if it’s multi ensembled. I just saw CPC 6-14 day and they hammer biggest rains south jersey to va.
  22. wdrag
    Agree 100%. While reality has not occurred... if this general modeling continues through both storms... this will be a memorable pair of events, NOT THE WORST but for January will rank as significant I think this more of a spring setup. We cant forget wind and coastal flooding. If the first one misses to our south, then the above paragraph is misleading.
  23. wdrag
    I am in agreement with you. If we are to suppress big time, I think we'll know at this time tomorrow. Models are improving D5 in and few major debacles that I recall. Anyone can refresh me on debacles since 2022 inside 5 days. Stuff I look at: 13z BOM rainfall through the 10th... VERY large but the 4" probably will shrink to 3. IF NOT, widespread moderate flooding would be my concern 10th-11th after the basic qpfs are done. BOM snowfall through Sunday eve. This is NWS base. BOM includes percentages of models and ensembles. I added one frequent flooder in NJ, but to give an idea what NWS uses for longer range til reality qpf hits the basin. This is for NAEFS 2.5" 4th-10th.
  24. wdrag
    A couple things: Added WPC 17z met expert desk on winter wx. They aren't perfect but they have tools we dont and faster. Also, I see a lot of references to big busts in the past. I think modeling has generally improved since 2020. Maybe this is another but odds are against a 1/2"+ qpf miss I84 south. Ptype another story. The 16z WPC QPF was probably made before GEFS 12z qpf... but now when you take the remaining ensembles from CMCE and probably the EPS...they have this more or less right in their 12z products. Also the thread was written for two storms... inclusive of large qpf by 00z/11 2-iso 6", potential for damaging wind and a snow event possibility to track. I dont think we said NYC would get heavy snow but we have members in CT/NJe PA that are interested. If I were to write thread for only NYC... much less often.
  25. wdrag
    fwiw...new 12z WPC qpf... similar to previous for Sunday. I do see all the discussion on suppression so will wait this out. Ensembles I think are best for now with the caution that the suppressed solution could win out. New D6 winter wx not available for a while.
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