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