Did you read what I have in the first line ?
I did mention they feel the warmest winter ever is possible .
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Here are my notes :
They feel the polar vortex takes up camp in the Eurasia / Siberia, if that happens then expect the warmest winter ever.
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Now if they are wrong and the PV weakens, or there is HL blocking , etc. They risk a rather substantial seasonal forecast bust , and then it becomes two years they have to revise.
Massive amounts of evidence ( climate warming, analogs, persistence, Nina background, West Pac warm pool, + NAO persistence, etc. ) all point to warm winter in the Mid Atlantic and SE. , including large portions of the country.
However, I am not sold yet on what transpires this winter. I still like late November and early December as an opportunity for cold here.