So in reality it’s not only the situation in the GOA, but the amplification (or lack there-of) of the NW-Pacific ridge and phasing of the 2nd shortwave with the ULL.
So even if the GFS is wrong w/rt the structure of the in-situ GOA trough, it could still end up correct about the ridge prograding into the PNW if it’s correct w/rt phasing the 2nd shortwave with the ULL upstream.
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