My things to watch for
a. extraordinary aurora borealis ranges and depth
b. severe weakening and wandering of Earth’s geomagnetic moment/pole
c. excessive P-wave noise emanating from Earth’s D” layer
d. a short ‘shudder’ in the geographic position of the Earth’s polar rotation

https://x.com/EthicalSkeptic/status/1988475958735634462?s=19

https://theethicalskeptic.com/2023/12/18/hidden-in-plain-sight/