The SER connects to the Greenland block.  That is pretty rare air IMO.  Some analogs for that (and the progression thereafter) are VERY interesting indeed.  I think SSWs are so individual in nature.  Some help and some make the pattern worse.  Flip a coin almost, but -NAOs are common w SSWs but by no means a guarantee. There is a reason folks like SSWs on the EC.  Ha! The 12z GEFS is a money pattern if it were to verify.  Looking around Feb26 - Mar1 as go time...likely right around March 1st but
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