STALL; all Northern Hemisphere systems appear not to move, or pivot and wobble in place

~A likely mid summer scenario one month ahead of time

    CMC 2019 06/04 00, 06, 12 and 18 UTC.  The anticyclones throughout the Northern Hemisphere
exist in one stationary place, nothing too much out of the ordinary, but the cyclones wobble, pivot without much distance from one sequence to another.  Only the cyclone North of the UK appeared to move for a while and then stalled along with all the others.   This in a series of events, all predicted well in advance Mid-April just past: http://eh2r.blogspot.com/2019/04/2019-annual-end-of-spring-and-summer.html  this stagnant global circulation has been happening for a while,  not long after the collapse of the Canadian Arctic Archipelago prime coldest vortice within the Polar Vortex; http://eh2r.blogspot.com/2019/05/collapse-caa-cold-temperature-north.html,  circulation stalls may be considered a feature of July,  when weather reaches maximum high temperatures.  WD June 4, 2019

Early SWITCHOVER; a warming signal, slows the Fram Flow

~When Arctic cyclones are colder than anticyclones,  it is officially summer.
~2019 came 3 weeks earlier than 2018
~Disrupting an otherwise devastating output of sea ice through Fram Strait

Apparently OUT from nowhere a Cyclone appears North of Beaufort sea:

    A "see through"  cyclone appeared May 25 2019,  CMC NOAA visible capture.  This has undoubtedly slowed the gyre clockwise rotation,  it is a disrupter of Arctic summer from being bombarded with sun rays.  University of Wyoming 1000 mb prognosis (above),  notice this Low has temperatures colder than adjoining High pressure.   It is a true sign of summer, hence a switchover, from Anticyclones being coldest (winter) to Cyclones cooling the effects of a higher sun (summer).  The relative permanence of this scenario will dictate the outcome of sea ice extent at minima come late September.  The biggest factor is the radiative solar penetration of  "see through"  cyclones,  if they are warmer the more sun will penetrate,  prompting either a rapid devolution or a greater melting than otherwise a cloudier Low may give.   This switchover came much earlier than last year,  the current trends indicate a 3 week ahead in time on 2018 events,  either the disintegration of the main CAA vortice or 3 week earlier switchover definitely means a different outcome than last year. WD May 26,  May 28 (correction thanks Jim) 2019

Unrecognizable in 21 years, warming evolution of the Northern world climate

~Comparing major sea ice melt years  reveals a much mangled atmosphere and icescape 

~The Arctic Atmosphere is very closely linked with sea ice morphology

~2019 outlook for sea ice has never been more grim

Arctic winters end in late April,  so it is appropriate to look at winters imprint on the Global Northern Hemisphere:

NOAA daily composites,  the real imprint of winter can be found right after peak cooling period, May 1-7 offers a glimpse:

1998 the then warmest year in history, really marked the start of visual from space Arctic Sea ice extent decline.   Observe the massive North Pole centric CTNP (Cold Temperature North Pole),  this was more usual when Arctic Ocean was covered by a much thicker sea ice canopy.

2007   The first really massive melt was just ahead, note the missing CTNP.  And note as well the faint outline of two vortices one over each continent. 

2012 the largest sea ice extent drop in history was to come,  note the early ridging bands taking shape within a much shrunken Polar Vortex compared to 1998.  These apparent waves or bands have a tendency to bring up warmer cyclones from the South or tend to create "Omega Blocks"  with persistent stable anticyclones.  Note the diminished size of the Polar Vortex as well.  

2016 with the biggest El-Nino in history just past,  a great year to compare with 1998.   We can identify the wavier appearance of the Polar Vortex, along with "rogue" vortices ,  smaller but colder, quite a ways displaced from the North Pole as with 1998.  The ice in 2016 was quite thinner than 1998,  hence more heat from Arctic Ocean tendency to split the main coldest vortice in 2,  usually moving them Southwards on each continents of the Northern  Hemisphere. 

2019 has the most disfigured Polar Vortex of all,  almost with 3 distinct ridges having within   smaller colder vortices again over the continents,  The Jet Stream was equally wavy for most of winter just past.  These ridges tend to accelerate cyclones Northwards or keep anticyclones very steady.  

   The most distinguishable feature between 1998 and 2019 is the disintegration or crumpling of the Polar Vortex coming along, not by coincidence,  with the drastically diminished presence of sea ice in volume and extent.  The term "Climate Change"  is now literally readily observable not only in the atmosphere but on and in the oceans.

     The end result of all this change can be observed by the rapid flow of much thinner broken up sea ice,  which if we are fortunate, can flow within the Arctic Basin,  but any massive favorable weather pattern may reproduce a bluer than ever Arctic Ocean, never seen before wide expanses of water,  at any given melt season.   It is not just a matter of time when there will be less than 1 million kilometer square of sea ice come September,  it is a matter of luck that it did not happen,  the greatest ally of ice as well are summer clouds, but if the temperature dew point spread widens from warming,  thinning clouds and or especially vanishing  ice enhanced fog will allow a far greater solar input.  Chances for 2019 having the worse melt in history are extremely favorable because the winter imprint of cold was lacking and there is not much sea ice cohesion left, again it is best if there was a summer El-Nino,  despite the counter intuitive warming El-Nino implies,  without summer clouds the North Pole will be a sea faring waypoint.  WD May 18, 2019 

Clouded Global heat transfers: from equator to North Pole

~Winter heat transfer between ENSO and the North Pole was usually in tandem with sea ice volume and extent.  La-Nina more sea ice,  El-Nino less sea ice. 

~Current 2019 Arctic sea ice extent is often very similar or worser than 2016,  which had a January with a very powerful El-Nino,  a fascinating fact. 

      In Arctic pure darkness of the long night,  only clouds prevents a massive cooling,  stopping very thick accretions of sea ice: 

      January 2016 equatorial Pacific spawned more clouds all over the world. In the Arctic this meant 

less sea ice,  it was so.  January 2018 had a small La-Nina,  it meant less Arctic clouds,  more sea ice,  it was so,  but not by much.  Same story January 2019,  a neutral ENSO or very light El-Nino,  less clouds,  implies more sea ice than same period 2016,  not so,  current 2019 sea ice extent is competitive or often smaller than 2016.   Less sea ice with a cooler than 2016 planet,  a contradiction,  translation:  heat was transferred to the North mainly in Arctic sea water, over time it has given a net increase in Arctic Ocean warmth.   Despite favorable conditions for ice accretion,  sea ice volume goes down.  Creating a feedback loop,  spring and summer sun has more dark water to warm. 

The Arctic atmosphere merely reflects this current heat scenario:

NOAA daily composites 600 mb temperatures, a very close representation of average temperature of the entire troposphere.  Spanning 4 to 11 May,  with respect to Polar Vortex strength,  2016 closely resembles 2019.  Yet 2019 has had nowhere the same heat input from the Equator.  2018 had a very strong Canadian Arctic Archipelago vortice within the Polar Vortex,  this was caused by a reduction of clouds and heat over the Northern American continent,  2018 sea ice extent was still reduced, prevented the Polar Vortex from being much fiercer.  However, the story here is the dwindling sea ice despite favorable conditions which should prompt a recovery.  The heat,  it seems,  is well dispersed throughout all the oceans of the planet, in turn,  extra heat within the Arctic system is reshaping the climate of the entire Northern Hemisphere.  WD May 14, 2019

Post Collapse III, flipping the summer forecast to opposite outlook

~North America's initial weather appears as EH2r annual summer projection
~North American great plains warm as a result of late April CTNP disintegration

  We remember NOAA's cooler in the central plains May June July temperature outlook:

Since EH2r expected not as strong as last year strongest CTNP vortice,  2019 vortice withered away remarkably fast,  this made the Great Plains not as cool as both NOAA and ECMWF suggested (here was EH2r criticism).

       One reasoning behind not agreeing with the great models outlook was the Canadian Main CTNP (Cold Temperature North Pole) did not have a strong prolonged build up similar to winter of 2017-18.  The initial sun disk readings taken in February to Mid-March 2019 were in 4th place warmest,  then vertical sun disks dramatically shrunk in size severely reducing average elevation decimal levels sun disk sizes to last place,  I was aware of monitoring a smaller vortice within the Tropospheric Polar Vortex,  smaller vortices are usually colder.  This changed my estimate of summer climate to come, from similar to last year, to different,  warmer in most regions.

   The latest GFS short term forecasts call for the opposite of the longer term outlook above:

   If the main driver of weather in North America weakens,  so does the Eastward circulation,  this means that land surfaces have greater chances to dry up, especially in the middle of the continent.
ENSO is still a main concern,  this weather may change,  but still ENSO lingers,  hesitates to take a turn up or down on the warm side.  This latest weather picture may last and build up much hotter. WD May 11 2019

POST collapse II, models are getting the picture

~There seems to have been two responses to main CTNP  vortice collapse
~One immediate, very fascinating,  one was slower movement of systems
~The other longer term,  a picture of things to come

When a deep cold supreme vortice within the Arctic Tropospheric Polar Vortex collapses, it seems there may be an immediate response on a grand scale, a shock to the system if you like. Similar to center of a hurricane eye wall reorganization. The immediate response seems fuzzy , but I suspect a sudden but very brief warming, followed by a more obvious slowing of circulation.  Of which,  wherever you are in the Northern Hemisphere,  the good or bad weather prolongs a bit more.
Toronto for instance,  is under the clouds along a good chunk of Eastern North America,    this will not stop suddenly,  but will gradually fall under the spell of clearer dry skies (as most of snow vanishes completely further North).

  For May 14  GFS changed its mind 3 times within 3 days of forecasting,  finally settling for a significant warming North of Ontario with a lot warming in Central USA.  Looking further:

By the 21st, the forecast Makes North Central Canada as warm as Florida while the clouds cool the central coasts of North America, this is a bit of a precursor of the climate to come. WD May 9, 2019

Post collapse circulation model responses, ECMWF seems a bit more on top of it

  Already May 6 Toronto forecast will be off with other models based forecasts,  underestimated at least 4 degrees colder.  But ECMWF short term is responding well to recent massive Arctic warm up.  What is left of the Canadian coldest vortice is more centered in the SW Arctic,  a place already with less snow on the ground.  Is set to extermination if stable there. 

600 mb temperatures forecast would be more ideal,  nothing is perfect!  But ECMWF has some prowess,  already displaying a greater warming throughout North America for the next 10 days. 


GFS not so fast on its feet:

           Temperatures upwards not as warmed as ECMWF but warming.  I got the impression the models don't weigh as much importance to the Arctic as they should.  WD May 6 2019

COLLAPSE, CAA Cold Temperature North Pole warming much faster than last year

~As expected ,  Canadian Arctic Archipelago has smaller Polar Vortex vortice than last year.

~Tropospheric Polar Vortex is collapsing as well.

~The key,  thinner sea ice, has shaped the coming summer climate for the entire Northern Hemisphere

2018 (left) tropospheric Polar Vortex covered a wider area and had a very strong Canadian Arctic Archipelago vortice which lasted a long time (of all vortices within the Polar Vortex).  Not by accident,  a good chunk of atmosphere is warmer in the Pacific Quadrant of the Arctic Ocean, which turns out to have thinner sea ice.   To date, this apparent collapse of the CAA vortice continued,  with extreme warming on the ground:

The look of the  NOAA 7 day surface temperature anomaly has nothing in common with today. 

The Arctic surface warming incurred since end of April has been astoundingly rapid.  This implies cold air centers of the Polar Vortex were smaller,  as I observed at my yearly summer projection,  the build up to this is from the strange effect found in smaller vortices,  which are often much colder than within the rest of the Polar Vortex, in addition to the overall construct of prolonged cold periods,  reinforce longevity of the PV.  In the case of 2018-19 winter,  the cold started strong first in North Central Russia, spread out slowly over the entire Arctic,  Canadian side had a fierce cooler period later, not as deep frozen as last year during end of late winter.   

   The current collapse of cold in the Arctic has significant implications further South,  which may not have been grasped by the models:

   Accuweather extended May 2019 temperature forecast for Toronto,  looks lame given +15 C fast warming covering a huge chunk of the Arctic,  will check in a week to see if AI has incorporated ongoing events in the High North correctly.  WD May 4 2019

Stratospheric temperatures are greatly influenced by the presence of Ozone.

~The start of the stratosphere is where ozone concentration begins rising significantly
~This creates a massive world wide upper inversion called the tropopause
~A cold ground air is not necessarily under a  high stratosphere deep freeze
~The best temperature level to judge the troposphere is 600 mb

   The tiny bit of atmospheric ozone in our world  has a huge influence ,  not only in keeping us safe from harmful UV light, but seems largely forgotten as the main greenhouse gas warming the stratosphere.  A lack of Ozone basically cools the stratosphere,  the famous CFC driven ozone holes
exist at about -80 C.   Too much ozone warms the stratosphere.  Not to confuse with sudden Stratospheric warming,  which does occur not too often ,  but some place too much emphasis on it.   Stratospheric ozone is key in stratospheric temperatures.   Some people strongly believe that stratospheric temperatures influence the troposphere.  Let's look at this:

April 25 2019,  NOAA daily composites, 600 mb temperature is very close to the temperature of the entire troposphere.  We see here a spring time  Tropospheric Polar Vortex ,  which its coldest vortices in dark purple.  So as a few experts like to say the stratosphere influences this.   Not so, the warmest 50 mb temperatures are right above the coldest Cold Temperature North Poles of the troposphere:

Is warmest, -44 C near the center of the locations having more ozone,  while over Europe,  at 50 mb level, it s -61 C  where there was far less ozone:

       The areas with the least ozone are in this case the warmer surface places.    So the stratosphere in  does not  seem to cool the troposphere.  Therefore emphasis on any explosive stratospheric warming event,  as rare as they may be,  must be taken that what happens in the Stratosphere,  often stays there. WD April 28 ,  2019

NOAA & ECMWF AI vs EH2r long range summer projections

~Astounding if not fascinating outlook differences
~El-Nino or ENSO is not the only player on planet Earth

   First,  EH2r outlook audaciously looks quite different than the 2 largest forecasting giants,  NOAA heavily relies on ENSO    :

This temperature chart for May June and July looks amiss.   It relies on ENSO dominating cloud coverage and therefore affect Midwest US temperatures,  which looks good for May ,  not at all,  according to EH2r for June and July.   First of all,  if there are more clouds coming from ocean sources,  the coast would be cooler :

  NOAA AI is in the clouds!   According to EH2r, not going to happen,  which unlike NOAA makes midwest USA June July quite hot because the flow will indeed come from the oceans,  but on West coast clouds keeps things cooler,  clouds dry out migrating East.  On SW coast I don't think there will be any dominant circulation,  favoring Death Valley records NOAA got this covered.  On East coast the simmering dry Midwest heat should  move to the Northeast coast making it indeed warmer than usual,  the Southeast should suffer same fate as SW coast,  no general circulation especially from July August  and more precipitation records should occur.


ECMWF surprisingly has some similar outlooks:

ECMWF long range likely has the NE Pacific temperature blob right.  North America warmer temperature anomalies are a bit illogical as well.  SW USA cool is perhaps cloud driven,  but this suggests something strong moving things Eastwards,  From the stand point of the Midwest not being dry and hot,  quite unlikely.  East coast of North America way cooler than should be.  Since EH2r projection makes the waning Polar Vortex smaller than summer 2018,  which had Midwest June July quite warm.  so I expect this same area warmer than 2018.    Western Europe may be off for JJA,  the Gulf Stream cyclones should mainly whisk to the NW of the  UK, this brings dry heat from Espana.   Basically I think ECMWF model is heavily influenced by ENSO.  Which is fine,  only if ENSO is foreseen correctly.  However,  ENSO's range is huge,  and there was no signals of a pending stronger El-Nino.   On the right bright midnight sun side,  the Arctic projection looks good but for over estimated cooler Tundra zones,  and North Japan is off as well.  WD April 26 2019