Something I see when I look at that data in detail is a spike this morning for a short while in Inflow numbers. Perhaps the smaller lakes above Oroville (which were full) are releasing water to be ready for the storm and any protection they can provide to level out the new inflow to the whole system.
They’re down to 887.94 feet now, with a steady 100,000 cf/s outflow, and variable inflow from above. I would presume that the upstream dams and such need to try to make room for more water with the upcoming steady rain event too.