Hunga Tonga volcano pressure wave

```Line graph showing measurement fluctuations over time from 12AM to 6AM. Y-axis ranges from 30.1 to 30.22, with current value labeled as "30.17 in" at approximately 5:14 AM.```

Early in the morning of 15 January 2022 (Phoenix time), the Hunga Tonga volcano erupted in the south Pacific Ocean. Tsunami warnings were issued for the coasts of the Pacific Ocean. As of the time of this writing (Sunday morning, 16 January 2022), there’s no word yet on damages to nearby Tonga.

Of considerable interest is that the eruption created a giant atmospheric pressure wave that traveled around the world. That pressure anomaly hit the weather station I have perched atop a building in midtown Phoenix, which you can see in the image. I believe the time of the +0.02 inHg anomaly matches up with when other sensors in the area saw that pressure wave.

Daryl Herzmann, who maintains the impeccable Iowa Environmental Mesonet (which I’ve written about before), tweeted out this graphic showing the pressure wave marching across the United States (EDIT, Sunday evening: a second graphic is below, and is objectively awesome):

https://twitter.com/akrherz/status/1482436390105272320

https://twitter.com/akrherz/status/1482834483762057223

The National Weather Service office in Phoenix noted the pressure anomaly as well. Their instruments, working in concert with other NWS offices, found two different pressure waves.

https://twitter.com/NWSPhoenix/status/1482746491504529408

And finally, for a good overview of the entire event, Scott Manley offers this video:

https://www.youtube.com/watch?v=zoMRwyNhqJ4