Silence speaks volumes! It's crazy to think that we are in the 2nd week of February now and this is the model output forum yet the last (only comment posted) was at 22:10 and this comment wasn't anything to do with tonight's 18z model output runs. - Just says it all really i.e - how uninspiring the models are tbh! I think a lot of model watching fatigue is not starting to kick in to many members including me! Most if not all of us have seen snow but we haven't really locked into any HLB blocking and there is still no sign of this given the SSW & split PV which caused the reversal of the zonal winds - now 5 or so weeks ago!
I remember typing something similar start of January and someone said to me to be patient you have the whole month of January yet and Feb etc and by that time we would have seen a tropospheric response with HLB around Iceland/Scandi or Greenland etc but now it's the 10th of February for heavens sake. Even winter 2016/2017 we had an easterly around 11th February which brought snow flurries to the south west Saturday morning of 11th Feb 2017 and lasted for 4 hours here in Exeter. Nothing settled it was just flakes of snow and then light snow on and off all morning until the snow became more sleety and followed by ice pellets in the afternoon time!
Back in February 2017 we never have a major SSW, let alone a split in the PV and reversal of zonal winds at 10hpa and 30hpa like this 2018/19 winter and back then we were in a westerly QBO - whilst that easterly back then didn't provide a major cold and snowy spell it still did occur without the help of a SSW/split vortex and zonal winds reversal at 10 and 30hpa and it was noticeable too (snow being one of them!) as you will see in the charts below. This was two years ago this weekend.(NOW!) Anyone remember this in the south?
Anyway, seeing as there is no snow, cold, HLB or easterly to discuss within the next 10 days i thought i would leave you with some below charts which brought us an easterly two years ago today for 3-4 days between 8th and 12th February 2017:
Commencing on Wednesday night into Thursday we already see the -10c isotherm @ 850hpa approach eastern half of the country:


Notice a trough of LP to our east developing over the N. Sea (lake effect snow) as you can see a small kink in isobars - this brings cloud and outbreaks of light snow and or snow flurries for many parts of southern and eastern England which extending westwards across south western England too!


So what Have I /we learn't? A SSW is not necessary to get HLB. It will never guarantee it! Maybe after last years SSW we were really fortunate to see such cross model agreement and not long after as well. SO of course expectations are higher! But next time I see a SSW occur I will not be raising any hopes of HLB despite what the LONG and Shorter range models forecast. They have all been utter rubbish this winter including the Met Office? The question is why? Maybe we can discuss this in further detail when winter is over in 3 weeks time. Would be nice to have a review and to see how things went so wrong in all short and longer range models!?
Anyway! So, my point is that we really don't need a major SSW to produce HLB as it proved in Feb 2017 as well and many other snowy or cold events. I guess I am confused and can't get over the fact that we have had such a major SSW with all the right qualities as alluded to above etc but with no delivery at all anywhere.
For instance, and here is a question to anyone? Would you say last weeks brief colder snap and snowy spell for parts of the south was the tropospheric response/ result of the SSW or not? Anyone? Because surely if it was then where was the blocking? I don't think so IMO we have not seen the effects on the troposphere and the NA0 has been positive all winter. IN MY OPINION - to me, LAST Thursday night/Friday's snowy spell was more to do with fate and cold zonality and an Atlantic low pressure system colliding with colder north to north westerly air mass. BUT there was NO HLB over Greenland or Iceland/Scandinavia at all!
Keen to hear about your thoughts on this? 

Originally Posted by: tallyho_83