Well, in the mid-to-long range, ensemble mean ridges appear flatter because increasing forecast uncertainty (variance) among members results in phase cancellation, dampening the ensemble mean toward the baseline.
Ensembles essential take the initialization of an operational and then sprinkle a little bit of variance across each member to track potentially different paths. This is done because models aren't perfect and cannot capture the total chaos of our total climate system, so ensembles regularize the result by trying different paths. However that also results in dampening as each member starts to go in its own way, so extremes in both directions cancel each other out.
What an absolutely revolting day with zero redeeming qualities. Completely unenjoyable.
Wait, scratch that, I love this. Room temperature air, clean off the Pacific with a slight breeze. A few pokes of sun despite the calm Seattle vibes. I'm neither dripping sweat nor being blinded. And we still have a round of heat in the long range to look forward to. These are the summers I remember as a kid.