CAA returns to prime cold spot despite massive prolonged warm advection event

~The return to Cold Center of the Northern world stems from very complex geophysics

~ CAA had short term very warm atmosphere,  remnants of this warming exists but fall as snowflakes.

~Deeply cold but regionally small CTNP's are unstable by the mere presence of  moderate cyclones. 

600 mb temperature charts of November 20-24 December 2- 3 2017,   NOAA daily composites. They depict an astounding warming of the CAA atmosphere peaking on  about November 24.,  note how fast it went from coldest to hardly an existing cold cell.     600 mb temperatures are very close to the Density Weighted  Temperature of the entire troposphere.    Even more fascinating, even when expected,  was the return on December 3 of Canadian Arctic Archipelago  to coldest DWT,  again it is the Cold Temperature North Pole.   How do we explain this?  It is complex because land skin temperatures vary from snow coverage not uniform at all everywhere.  The quick warming of the CAA demonstrated  its canopy of mixed conditions,  with likely not so much snow on the ground,  the top permafrost and snow cover warmed rapidly.  When the Mega blizzard advection event ceased,    it snowed a lot more than previous recent weeks,  this covered the warmed top landscape slowing the cooling.  But cooling did occur nevertheless,  by radiative cooling of top of snow and slowed sublimation,  because of fresh flaky snow fall  relative humidity remained high diminishing  the sublimation rate.  

     But the atmosphere cooled faster aloft,  mainly oblivious to low clouds,  in other words, 

the clouds cut off heat to the upper mid atmosphere,  enabling its rapid cooling.   Which inevitably exacerbated the cloudiness and extra snow precipitation,  by stronger convection of lower warmer atmosphere.  

     Even though the Northern Hemisphere had one coldest cell over Eastern Siberia (November 24) and the warming event was about 10 days long,  the Jet Stream didn't change that much in position,  because 10 days is apparently not enough to cause major Jet Stream deviations causing disruptive weather or Global Circulation changes.

     Now is the time when little covered or bare Arctic lands start the mega-cooling process,  excess snow cover cooled  some Arctic autumn locations,  this insulation carpet now changes roles  to save the Arctic from extreme deeper freezing.     Areas with very little snow cover will now on start to change the nature of CTNP's,  from 2 current strong ones to a third or fourth  smaller ones.    We look for them around the Urals and Alaska.  Meanwhile CAA cooling along with NE Siberia will undulate the Jet Stream worldwide  WD December 6 2017

Remote sensing snow cover appears to be not measured accurately

~ It is perhaps a great technical fundamental flaw which disables accurate long term forecasting

~ New refraction technique suggests that snow on ground behaves exactly as on sea ice which is :
Top of  wide span 100% snow layer T*** is always colder or equal than surface Temperature   
                                                                T***<=Ts
       (A snow layer is not freshly fallen snow,  it is a layer on ground more than several days old) 

~ Taken on a wider Global scale we can identify where the areas with most snow cover lay.

None of these Remote sensing current maps are similar in any great way.   We have N18 (Dec 1) which is NOAA,  the German one Wetterzentrale (Dec 2) and Canadian CMC (Dec 1).     CMC has central Quebec with a lot of Snow,  unlike Wetterzentrale  which has a lot of snow on its Eastern side and NOAA looking completely foreign to the 2 others with more but less significant snow cover in Nunavik (Northern Quebec).    Wetterzentrale has a lot of snow in Russian Urals NOAA doesn't at all.  NOAA has a vast layer of expansive thick snow in North central Siberia unlike Wetterzentrale which has a thick snow carpet in NE Siberia.    CMC has a lot of snow in central or the Alaskan interior  unlike Wetterzentrale more like NOAA.    It is hard to make out CMC's Canadian Arctic Archipelago snow cover because of numerous Glaciers on its Eastern side.    NOAA has Canadian boreal forest tree line gap of less snow unlike the other 2 maps.

Confused?    Just where are the areas with most snow cover?   If we go by a simple gathered by optical refraction rule:

                                                                       T***<=Ts

           It means that all places with important thick cover will be cooler than normal,  because the sun,  although weaker by low elevation,  would warm the ground more if bare, which was heated up by the summer.  So we look for places with cooler temperature anomalies,  given that even with warm or cold air advection,  time will bring out the cooler locations:

       Last 30 days NOAA reanalysis suggests Wetterzentrale  correct for Northeastern Siberia and NOAA incorrect about the snow gap of the Northernmost tree line (there should be more snow not less there).    However there was a huge anomalous advection of warm air throughout the CAA,  as reported on previous article below.   We must go prior to November 22 to get a better picture:

   NOAA temperature anomaly October 22-November 22 .   We can note the CAA appears cooler before the warm air advection,    the cold was indeed in Northeastern Siberia and the Canadian tree line,  suggesting that these lands are laced with thick snow layer.    But there was a normal CAA cooling despite greater open water:

  The tree line bit was not as cold as NE Siberia and the CAA which prior to November 22 was the coldest place on Earth.   There was early snow over much of the CAA which sublimated and gradually diminished in thickness before the Arctic mega blizzard.    In conclusion ,  there is a lot of snow Northeastern Siberia,  but need to confirm the tree line bit.  December 3, 2017

Global Circulation flipped by mega blizzard with no wind directions change for a week at 40 to 50 knots.

~CAA  Cold Temperature North Pole captured a Low otherwise on its way to NW Europe
~The dynamics were similar to  heat machine fueled by the temperatures contrast between  warm and cold, open Oceans and a frozen Arctic scape.

    A remarkable blizzard spanning a great deal of the Northeastern Canadian  Arctic essentially made winds  coming from a rock steady direction for weeks.    Record temperatures warmed all of the Canadian Arctic Archipelago for the same time period,  heat injected from the oceans displaced and weakened and moved the CAA Cold Temperature North Pole,  which had garnished cooling for months,  further to the South and West in a matter of days.   What happened was a matter of weather dynamics which forced two main geophysical opposites,  warm and cold atmospheres in a fused static stalemate:

From 18th to 24 November this CMC 22 November surface analysis is the picture of the blizzard week.  A perfect,  stuck in place,  heat engine with heat from the East open sea waters meeting the coldest air in the Northern world head on.     At first,  the center of cold was  steady strong over the center CAA:

The main dominant cold air zone of the Northern Hemisphere had a weaker twin Northeastern Siberia,  in between  huge strong anticyclone,  which given the right conditions,  can push the strong CAA CTNP  southwestwards.  The arrival of a low pressure centered about Hudson Bay was just what was needed.  And so the biggest pan Canadian Arctic mega blizzard of 2017 happened with a trowal which lasted as long as the Hudson Bay Low persisted.    As  a result ,  record warming reigned throughout the Canadian high Arctic .      This Low didn't move for a week along with static wind directions everywhere. 

     Global weather circulation was thus changed  in a few days,  making Northeastern Siberia coldest atmosphere at present.  But this is changing quickly,  as the CAA permafrost was seriously cooled prior to this warm air advection, which means that the CTNP will soon return to dominate on the Canadian side of the Pole.wd November 25,2017

Winter 2017-2018 is definitely taking shape.

~ New state of the art refraction technique confirms Canadian Archipelago atmosphere set to dominate Global Circulation.

~Each winter is unique,  2017-18 is set to be dry in most parts.  With normal cold and abnormal warming in about equal distributions.

~ The mystery of the warming Russian Northern Urals.

   Elegance in darkness, winter rises from frozen grounds,  left without snow it starts later,  laced with a thick layer it seems to manifest weeks earlier.  The larger question to ask is whether  deeper earlier snow brings the bitter coldest winter.

   If we look at current data,  compare to winter 2016-17,  the answer to that question is a likely NO:

 Air areas marked in brown are Cold Temperature North Poles (CTNP's),  2  of them,   one over the CAA the other hovering NE Siberia.   Winter 2016-2017 main Arctic feature was the extreme North Atlantic snow dump from Atlantic Cyclones heading strait towards Russian Urals.  This meant a greater injection of moisture  towards Northern Greenland and central CAA (Canadian Arctic Archipelago).   As a result there was a double the normal layering snow carpet.  This prompted an earlier onset of CAA winter,  but over the long run reduced ground surface cooling.

 Current state of the art land refraction observations tend to agree that the beginning of winter 2017-18 is substantially colder over the CAA because of the relation of earlier more snow on ground blocking the heat which would come from a warmed by summer permafrost :

   Early 2017-18 winter has a major circulation change which affects most of the Northern Hemisphere weather.     The CTNP cells have switched roles ,  CAA being colder and bigger than 2016-17.  This is of great interest.   Western North America has cooled,  while Eastern North America has baked to the delight of extended summer lovers.

      As a result,  places like Ottawa Canada,  New England USA,  England UK  and NW Europe
felt the full blast from Gulf of Mexico and South Atlantic heat.

   Temperature anomaly map of NASA GISS  describes beginning of winter 2017-2018  quite well,  the heat injection to Arctic in 2016-17 has slowed,  it is still warmer, but nothing like 2016-2017:

 October 2016-17.   Here we see the effect of the CTNP cells  with a different morphology.   The heat injection towards Northern Central Russia has basically vanished because it was mostly spent feeding the Arctic heat wave.

     So the location or lack thereof of snow on the ground literally steers the Global Circulation.  But that is not a constant relation,  if snow cover starts really early in autumn,  this will generate a cold temperature zone,  the center where warm air gravitates.  If the snowfall stops for a long while,  warmed by summer permafrost will be exposed and this warming source will dull's winter's might.   It may sound off,  but snow sublimates and compacts for the greater part of the long Arctic night world.    If not replenished,  mid winter would warm for a while then the ground frozen hard by exposure with radiation to space would be a source of devastating cold air.   If there is greater snow cap on ground instead,   winter would appear brutal early but much warmer at end,  because the ground didn't loose so much heat,  and would help melt light reflective snow earlier.   A very much similar thing happens on sea ice,  but more radical,  a thicker snow layer on sea ice would make it thinner till sunrise from long night,  compelling melting even faster come late spring.

     At present,  2017-18 seems to tend going towards a very warm Euro-Asian Arctic winter, 
while CAA is coldest,  we observe if the cut off of snow supplied from the North Atlantic by way of the the North Pole continues,  if so,  permafrost will freeze hard,  sea  ice will thicken more,  a very cold CAA CTNP will dominate weather as is for quite some time in the foreseeable future.    Meaning the October 2017 NASA GISS anomaly map may twin or thrice repeat for November and December 2017.  WD November 17, 2017


 

New World Order in global atmospheric circulation is taking shape.

~The post 1998 period has a definite simple Global Circulation footprint
~Hurricane track Northeastwards  shift is understood by it. 

   Current autumn 2017 dominant circulation has 2 cold cells,  one NE Siberia,  the other usually strongest coldest Arctic Archipelago -Greenland zone.   This is what dictates a great deal of your weather if you live in the Northern Hemisphere.  In Novembers past ,  the look was different,  with the colder zones much vaster.  In response 2017 autumn was extremely warm for the largest part of North American NE coast and well further inland.  The larger question is whether these cells will remain largely similar for upcoming months. 

     The answer lies in whether we can accurately measure snow cover or not.  Current cold zones were largely built from seasonal snowfall. 

Snow is a widely misunderstood white matter, the coldest zones have naturally more snow on the ground because temperatures are almost always below 0 C. But it does not mean that where snow lies the coldest atmosphere can be.   A snow layer on top of a warmed up by summer permafrost, means that the permafrost doesn't loose so much energy to space. A closer look at the Canadian archipelago reveals far less snow on the ground than Siberia, the Archipelago always had open sea water, yet the weighted temperature of the troposphere is consistently coldest over the CAA (Canadian Arctic Archipelago).    But snowfall has largely stopped,  sublimation and compaction 

has rendered its initial snow cover thinner,  exposing the ground further during darkness only to consolidate the cooling further.

    The perfect coldest Northern Hemisphere winter would start with extensive early snowfall in autumn, then none at all for the long Arctic night followed by extensive snow precipitation April onwards. So far 2017 is following that pattern in the CAA. 

     A curious pattern shift was discovered as cited by PBS 2017 NOVA's killer hurricanes broadcast, the hurricanes use to crash consistently straight Eastwards into middle mesoamerica, now their end tracks tend to have shifted towards the Northeast. A plausible explanation would come from the Global Circulation as cited above. The remainder of the coldest 

atmosphere survives in summers in the CAA-Greenland region. This is due to great sea ice melts, much more frequent than not in the last 2 decades. Only Greenland and CAA glaciers complement the remainding dwindling September Arctic Ocean sea ice. This solidifies the center of Global Circulation to CAA-Greenland in summer and fall, the flow on NE America's coast has now been intensified, dragging everything found within,  warmer weather, Cyclones or hurricanes to move likewise. WD November 5, 2017.   

New signal of a warming Arctic Ocean: the Green flash green sea

~Never observed literal greening of the NW passage
~The likely cause was a much warmer top of sea opposing a quick refreeze caused by light winds...

    30 Years ago Arctic top of sea refreezes,  particularly here,  75 North 94.5 West,  were often in early September,   at the first chance of light winds,  then after October was bitterly colder,  fostering the onset of winter to last till June.  During these older days, the boating season was about 3 to 8 weeks long,  since on shore fast ice came so early  and the sea ice broke up as late as August.  Now this season is almost always more than 16 weeks.

    Freeze-up 2017 was no different than any other except it came late,  a feature of the post 1998 sea ice period.  Grey ice comes almost always when there is a calming of winds during clear air events.
There is yearly one natural cloudy season for the High Arctic from Mid April to Mid September,   this season has changed recently,  it comes often mid April  as usual,  but became more intense,  with heavier precipitation for months.  Post 1998,  this cloudy season stretched often till end of October,  making freeze-up much more difficult,  another component is the -11 degrees C mark,  which is the most observed temperature which causes grey ice.  Although sea ice freezes at -1.8 C,  it takes much colder air temperatures to counter balance the net thermal top of sea state not at all at its freezing point.  If there is a warming of sea water it does not mean that freeze-up will always come later, it is a matter of the right circumstances.

      With right conditions:  clear skies, calm seas, temperature nearing -11 C;   freezing may occur.  So it was  September 19 2017,   the winds were quite slow less than 5 knots,  the sky was clear (an unusual autumnal feature),   some freezing started:

      Never seen before "green flash green" sea,  a refraction effect not entirely understood.    Definitely new,  the green may be a mix between horizon sky and the natural sea water blue we usually observe at all sunsets. 

    Past blue seas at sunset examples abound,  I picked a few:

    Practically all open water sea sunsets are dark blue (grey when cloudy),  even with exact 2017 conditions.   The orange horizon of 2012 is identical to 2017,  yet with dark blue seas.

   September 19 2017 sunset occurred mid air,  signifying thermal inversions,  note the lack of reflection of direct sunlight over the sea, there is a band of thermal layers,  called ducts,  intensely stable temperature wise.  This is done with clear air, light winds and in this case,  the fresh formation of a very thin layer of sea ice.  Right above the newly formed ice the air was automatically colder,  higher up near surface air was warned by sea water before the ice showed up.   Latent heat of fusion also released some heat which ascended higher by buoyancy,

   But this new very thin ice did not last,  temperatures warmed to the -3 to -5 C range on September 20 and 21, come the 22nd.  All new sea ice was gone.   Again,  worth to note that sea ice may melt with surface temperatures above -11 C, 

   This  "green flash green" ocean was a never seen before event,  it showed up roughly 40 minutes after the blue ocean with the sun above the horizon at about 5 degrees C elevation  (first blue sea horizon picture).   With the lower sun,  the orange horizon came about, implying very clean air conditions.  The distant ship seen in dark shade hues was captured upright,  but betrays the very complex layering just below.   One of which demonstrated a Wegener blank strip,  a relatively rare optical event,  implying a steep thermal inversion,  a blank strip is an optical construct consisting of a very long thermal duct,  very distant having no light from above or under which can penetrate it,  therefore the darkened layer black impression you can particularly see in the un-zoomed picture with the green sea.

   Implications:

     The 'never seen before' aspect of this event,   is a major discovery,  the reasons for the greening of the sea horizon,  needs to be modeled,  in other words , replicated by computer animations.  Historical GRIB data should also have steep inversions above the sea surface below 46 meters ASL. 

     This is a splendid example of atmospheric optics readily available to verify state of the art atmospheric computer models.  If the models do not have inversions below 46 ASL,  they need be improved.  WD October 24 2017.   

    

What was Hurricane Maria pushes the jet stream North, take 2

~ A very fascinating feature of post hurricane cyclones was captured again.

2016 Hurricane Nicole turned extra tropical Cyclone peculiar feature  (explained here),  may seem ancient or distant,  given the comparatively busy 2017 season.  But there were much fewer hurricanes over a longer period,  from 2006 to 2015,  despite much warmer oceans,  in fact the conclusion that there would be less frequent but more powerful hurricanes was correct (Emmanuel),   not like Typhoons,  which are storms from a different huge Pacific Ocean playing field. 

Note the regular feature of Jet stream (drawn green)  on this CMC Oct 7, 2017 1800 UTC surface analysis chart.   It contours the Southern part of Cyclones,  this is a normal for the Polar jet stream ,  except for where a peculiar  Cyclone  near south east Greenland (ex hurricane Maria) seems to push the jet to the Northwards,  the jet contours the Cyclone very unusually.  It seems being more like an anticyclone .WD Oct7, 2017

The Very good work of MIT's Professor Kerry Emmanuel

~ "A-new-study-says-hurricanes-will-get-stronger-and-more-frequent-thanks-to-climate-change"

~  Contrary to fringe media gossipers bent on lying and ignorance,  science at times can be prophetic;

less frequent but very strong  hurricanes are at play.  As published in a journal many years ago (since at least 2005).  

2005 full season 

First system formed 

June 8, 2005 

Last system dissipated 

January 6, 2006

(record latest, tied with 1954) 

Strongest storm Name 

Wilma (Most intense hurricane in the Atlantic basin) 

• Maximum winds 

185 mph (295 km/h)

(1-minute sustained) 

• Lowest pressure 

882 mbar (hPa; 26.05 inHg) 

Seasonal statistics 

Total depressions 

31 (record high) 

Total storms 

28 (record high) 

Hurricanes 

15 (record high) 

Major hurricanes (Cat. 3+) 

7 (record high, tied with 1961) 

Total fatalities 

3,913 total 

Total damage 

$158.9 billion (2005 USD)

(Costliest tropical cyclone season on record) 

2017 partial season 

First system formed 

April 19, 2017 

Last system dissipated 

Season ongoing 

Strongest storm Name 

Irma

• Maximum winds 

185 mph (295 km/h) (1-minute sustained) 

• Lowest pressure 

914 mbar (hPa; 26.99 inHg) 

Seasonal statistics 

Total depressions 

12 

Total storms 

11 

Hurricanes 

6 

Major hurricanes (Cat. 3+) 

3

Total fatalities 

91 total 

Total damage 

> $70 billion (2017 USD)

     The past 12 years were not exactly busy ones for hurricanes,  quite unlike typhoons.  

the South Atlantic has its own weather factors going,  namely its smaller size than the Pacific, ENSO influence and the effects of dust from the Sahara desert.  The latter was observed in late July falling over South Texas.   Perhaps the Saharan dust plume relinquished in later August letting the hurricanes form without dust impediments:

   March 2017 Saharan dust plume North Africa is seen to the upper right.  It makes a great deal of sense that dust may simply inhibit hurricane development,  also likely a warmer planet, in turn Sahara,  will diminish the number of hurricanes forming.  Hence the likely further warming  of "uncooled" South Atlantic sea water,  as it is known,  that hurricanes mix the underlying lower cooler layer of sea water with the very warm surface sea under its path.   The further warmed more stable  sea water may give incredibly stronger hurricanes whenever the conditions are ripe.  

    The good news ,  certainly needed,  is that the last Arctic cell of massively cold air exists at this time in the Greenland-Ellesmere-Devon-North Baffin region, is as strong as can be according to current High Arctic vertical sun disk measurements,  quite compressed, similar to March even though the density weighted temperatures are 10 degrees warmer.  The mid to higher upper atmosphere is much cooler because there is less clouds than over the rest of the Arctic.   This cooling positions the jet stream and or circulation directly further South towards where the hurricanes are.   This is a better scenario than what happened with Harvey in Texas. WD September 7, 2017

Weakened Global Circulation consequences; hurricane Harvey has nowhere to go

~ NYTimes sums it up: “This event is unprecedented & all impacts are unknown & beyond anything experienced,” the federal service said on Twitter on Sunday."

~ Not only isolated to Americans but To India and Bangladesh seasonal monsoons: "Modi said the floods had wreaked havoc on a massive scale, adding that altered weather cycles linked to climate change were having a big negative impact. He announced 200,000 rupees’ compensation (£2,374) to the families of those killed in the deluge and 50,000 rupees to those seriously injured."

~ Japan was not spared https://www.japantimes.co.jp/news/2017/08/23/national/high-pressure-boots-central-tokyo-rain-system-21-day-wet-stretch/#.WaSNatOGNTY" Not only for only Tokyo area.

~Europe had mostly very hot weather as predicted:

http://www.euronews.com/2017/08/07/heatwave-lucifer-testing-southern-europe

~ A huge Swiss Mountain Landslide came with the heat and melted permafrost:
Permafrost thaw

"The reason is that the high mountains are not as cold as they once were. Marcia Phillips, a permafrost researcher with Switzerland's Federal Institute for Snow and Avalanche Research, has been analysing temperatures all over the Alps."


Hurricane stalls are not necessarily very rare, but Global Circulation not moving normally has consequences all over the world.

If you weaken the source of Arctic cold air creating the familiar Global Wind patterns , a more stagnant circulation ensues, as such predicted in April:

  If you shrink the mass of cold ice to a much smaller surface area, circulation stalls would occur all over the world, as they have. We remember numerous Hurricanes such as Katrina, Frederic and others hitting ground but not lasting long over the continent, swiftly brushed away mainly to the North North East.

     

The remarkable projection right above this CMC August 28 2017 1800 UTC surface analysis, placed the main Highs and Lows pretty much where they happened today.
It is not a coincidence, but rather a correct interpretation of the future. We look at further details with IR animation:

What I noticed , is particularly the Western Part of the US, the Southward flow of clouds, Hurricane Harvey more or less stalled with a very small North Eastwards drift. Northern Canada has the flow which happens most times over the SE USA.

These are unfamiliar weather circulation patterns, which of course were born from the planet consistently warming. The extra rain pretty much happening on many planetary locations is due to the remnant of a strong just past El-Nino seeding combined with greater evaporation rates boosted by this warming. WD August 28, 2017

Almost everything predicted for 2017 is turning out

http://eh2r.blogspot.ca/2017/05/annual-bit-late-2017-northern.html

  The linked above annual spring projection of important weather events is doing just fine.

" The Okanagan valley BC will be hot and dry at first then turn quite wet, Midwest North America will be mostly dry and very hot"

  My favorite prediction written when the Okanagan was on the verge of major flooding due to extensive winter snowfall and spring rain.  The "theory of persistence"  would have made this catastrophe possible,  but the Northern in provenance atmospheric circulation saved the valley (as projected).  The moist Spring turned to above Normal temperatures:
 https://www.esrl.noaa.gov/psd/map/images/rnl/sfctmpmer_30a.rnl.html

Western European Heat wave,   check : http://www.france24.com/en/20170622-paris-pollution-peak-driving-ban-europe-heat-wave-longon-portugal

Less American Tornadoes,
check :http://www.spc.noaa.gov/climo/online/monthly/newm.html

    Note the earlier more intense period of tornadoes,  preceding lesser numbers when there should be more.  The prediction was about this period after mid April.

ENSO to Neutral, 

 check: http://www.ospo.noaa.gov/data/sst/anomaly/2017/anomnight.6.22.2017.gif

   Note the residual cloud seeding from El-Nino 2015-16 replenished water to many areas of the Earth stricken by drought.  

"I would expect record number of melt Ponds -late- from all that thick snow cover. This will accelerate the melt rapidly, numerous melt ponds will signal the start of very rapid melting, after seemingly sluggish melt daily rates interspersed with at times great variations caused by the lack of sea ice consolidation."

   This is indeed happening.


"when this snow disappears in June, there will be huge water ponds, the ice will vanish extremely quickly then after."

   Needless to say,  let us use Barrow Strait Canada with picture animations:

  In 2016 Barrow Strait had significant snow cover over sea ice,  the Strait cleared of ice late June:

http://eh2r.blogspot.ca/2016/07/sea-ice-affected-by-lot-of-snow-end.html

   Winter 2017 had significantly more snowfall especially at end of the long night:

  Down the Baffin Bay drain!   One month earlier than last year.  The sea ice did not stand a chance to withstand even seasonal weather,  because it was so thinned by a very thick snow cover during long Arctic night accretion.  The same is expected to happen wherever there was more snow cover over sea ice,  which may be pretty much the entire pack.  

       So now we wait Barrow sea ice disintegration to hit the larger remaining ice pack.   WD June 24 2017