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Snowy L

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Everything posted by Snowy L

  1. Snowy L
    Not too much change on the GFS so far. Low pressure slightly weaker and the warm sector very slightly further south at t96. Looks like we may be sacrificing the heavier ppn for a greater chance of the ppn being snow, which I'm happy with.
  2. Snowy L
    Some areas could see many hours of snow if Tuesday's event comes off. The front is hitting us in such a way that some areas could easily see 10-15 hours of precipitation.
  3. Snowy L
    I don't think anyone is expecting heights in that area in the next 2-3 weeks at least. The AO and NAO are expected to surge into high positives in the next few days, most likely the final precusor before an SSW in mid Jan. I think full on zonal will be the way for the next 15 days at least.
  4. Snowy L
    Looks like a proper split vortex on the GFS 18z http://www.instantweathermaps.com/GFS/2014122318/NH_HGT_10mb_384.gif Will be interesting to see the Para strat temps as well as it looks like we have a precursor to an SSW split forming in the troposphere http://www.wetterzentrale.de/pics/Rpgfs1981.gif
  5. Snowy L
    I believe this is what shannon entropy is? AO values ranging from -3 to +4 http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/ao.sprd2.gif
  6. Snowy L
    So much shortwave drama to get through, the differences between the ECM and GFS even at 96 hours is huge.
  7. Snowy L
    Looks like it's GFS shortwave nightmare vs ECM perfect Greenland High again. Unfortunately for us GFS has almost always been right for these scenarios in the last few years.
  8. Snowy L
    Interesting 18z, with a proper Greenland High established, the stratosphere charts are going for Atlantic based warming in 2 weeks. http://modeles.meteociel.fr/modeles/gfs/runs/2014121718/gfsnh-10-384.png?18
  9. Snowy L
    GFS has very quickly changed its tune regarding NW Eurasia heights. Looking increasingly likely that low pressure will move into West Russia and disrupt any wave breaking. Aleutian low signal is becoming a bit weak too. Might have to wait a bit longer for that SSW, maybe mid-late January. http://mp1.met.psu.edu/~fxg1/ECMWF_0z/test8.gif
  10. Snowy L
    There's always time for a split though right that could possibly occur after this first warming and displacement? Back in Dec 2012 we only saw the first signs of a second warming producing a split in the FI of the December 25th outputs.
  11. Snowy L
    When did this happen? The only time I remember this happening was in 2012/13 in January and we still got a good cold spell. If anything the mix of scandi high + Greenland vortex gave us more snow as massive lows collided with the cold air.
  12. Snowy L
    With the Aleutian low going nowhere these next few weeks (thanks to El Nino) and heights over NW Eurasia there is no reason why we won't see multiple warmings over the next few weeks.
  13. Snowy L
    850 temperatures in the Baffin bay area looking so much better on this run. Looks like a good northerly set up as well, this is only in 6 days time yet the difference between the 06z is pretty big. http://www.wetterzentrale.de/pics/Rtavn1561.gif
  14. Snowy L
    It's not within the reliable timeframe I guess, though it's expected as we will likely see the formation of 2 major tropospheric pecurrsors to wave 1 breaking in the next 7-10 days. Both ECM and GFS are going for low height anomalies over the Aleutian Islands and higher anomalies over Northwest Eurasia. GFS in particular shows this nicely http://mp1.met.psu.edu/~fxg1/ECMWF_0z/hgtcomp.html
  15. Snowy L
    GFS really ramping up that warming now, clearest one yet:
  16. Snowy L
    Not too much difference between the 12z and 18z, one thing is that in the 7+ day range the vortex area over Greenland looks smaller compared to the 12z.
  17. Snowy L
    I think that has been put on hold by lower pressure over Siberia/Mongolia, which has stopped the formation of the Siberian high, which is the major wave-1 producer. It looks like this low pressure will leave throughout the next week and high pressure will begin to build again. A common theme in the last couple of days from the GFS FI is the emergence of a big siberian high at day 10+, which may be the reason for a bit of a warming in the stratosphere being predicted in a couple of weeks.
  18. Snowy L
    Would trust MOGREPs ahead of any other chart. That model nailed the failed easterly in Dec 2012, the cold spell in Late Jan-April 2013 and the failed attacks on the vortex in winter 2014.
  19. Snowy L
    So in around 10-15 days, it begins?
  20. Snowy L
    I'm guessing it would end up circling the cold area and attack from Siberia like these warmings almost always seem to do. These slight warmings at t360+ have been appearing and disappearing from the GFS for a couple of days now, the parallel seems particularly keen to start a warming in late FI. Can't take it seriously though, I think last year we found out the hard way that these stratosphere charts have their own FI threshold and that it is a lot earlier than most thought it was.
  21. Snowy L
    Thank you very much Both GFS models continuing with the idea of the azores high ridging North and low pressures moving along the top of it. Could become quite cold in central and Northern areas. http://www.wetterzentrale.de/topkarten/fsgfseur.html
  22. Snowy L
    Do you know where I can find those MJO height composites for each month?
  23. Snowy L
    Azores high ridging in is what has constantly denied the jet diving south these last 2 winters.
  24. Snowy L
    Really unfortunate placement of the Greenland lobe though, need further wave breaking originating in the North Atlantic.
  25. Snowy L
    We can always get a further warming from the North Atlantic as a result of wave-2 push the Grenland lobe further west, as with 2012/13.
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