18z GFS takes this Pacific storm down to 919mb and it's easy to see why. It's in the left exit region of a strong 200kt+ jet streak coming off of Asia and a right entrance region of a jet streak. This promotes mass divergence aloft allowing for a rapid deepening of the storm.
On top of the divergence aloft, there's a strong temperature advection which further enhances the frontal boundaries. As the cold air mass moves south and the warm air mass moves north, it rotates cyclonically helping to create +PVA in the area allowing the storm to deepen.
The Ocean Prediction Center has it dropping to sub 930mb with the low reaching 927mb on New Years' day. This will be approaching an all-time record low for this area so it'll bear watching if it reaches sub 924mb which is the record.
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