Op de site van Cohen vind ik het volgende (per 19 oktober):
"Northern Hemisphere Snow Cover
Seasonal snow cover continues to advance both across Eurasia and North America, though so far snow cover has advanced more rapidly across Eurasia. Eurasian snow cover is above normal but is still lagging the two previous years at this time (Figure 10). Still with three weeks into October we are becoming more confident that Eurasian snow cover extent for the month of October will come in above normal. Also recently the snow cover across Eurasia has advanced more to the south across East Asia. This has resulted in a jump in the snow advance index (SAI) value for this month, since only snow cover equatorward of 60°N contributes to SAI values. The SAI is currently close to normal. North American snow cover advance has also accelerated recently and is also currently above normal especially in Eastern Canada. Above normal Eurasian snow cover extent for the month of October favors a negative winter AO."
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