I did not know about this, and precedes a possible tidal wave. https://twitter.com/Ben_Domensino/status/1482282515616645123
My barometer picked up the atmospheric pressure wave from the Tonga volcano. I had thought it was just a passing CuNim which obscured a good cloud timelapse at that time but using the Tempest map I could look up the coast to see exactly when the max high pressure spike flowed past other stations.
and up the coast random Tempest stations:
And another half hour to reach Tasmania:
And it took just over one hour to travel the length of New Zealand (clocks are 2 hours ahead to Australia:
Top of the North island:
To bottom of South island:
Might be valuable data for something?