I asked some of the more knowledgeable people around here and this warmup does have legs. MJO moving to phase 5 being one piece of the puzzle. However it’ll be more like a week of 50s instead of a 70 degree torch.
From what I saw on the enso thread the most extreme anomalies are supposed to be further south and west of the east coast. So I’d be more on board with 50s.
That was before the widespread sentiment shifted to this one having legs.
In fairness every bad pattern thus far got can kicked, it was quite recently when this upcoming one showed to be legit.