World Meteorological Organization on X: "The pressure wave generated by the volcanic eruption in 🇹🇴Tonga just went over Europe. A barometer in 🇨🇭Switzerland measured a 2.5 hPa amplitude. These facts are reminders
![Matt Roberts on X: "Looks like the atmospheric pressure wave from the #Tonga #volcano eruption reached the US west coast ~4AM and a full 3-4 hours before expected small tsunami waves. The Matt Roberts on X: "Looks like the atmospheric pressure wave from the #Tonga #volcano eruption reached the US west coast ~4AM and a full 3-4 hours before expected small tsunami waves. The](https://pbs.twimg.com/media/FJJtUCMVkAQR-UN.jpg:large)
Matt Roberts on X: "Looks like the atmospheric pressure wave from the #Tonga #volcano eruption reached the US west coast ~4AM and a full 3-4 hours before expected small tsunami waves. The
![Brian Brettschneider on X: "The pressure wave from the Hunga Tonga-Hunga Ha'apai eruption arrived here in Anchorage at 3:30 a.m. AKST. This is exactly 7 hours after the eruption. The volcano is Brian Brettschneider on X: "The pressure wave from the Hunga Tonga-Hunga Ha'apai eruption arrived here in Anchorage at 3:30 a.m. AKST. This is exactly 7 hours after the eruption. The volcano is](https://pbs.twimg.com/media/FJKA4b9VEAEy3RT.png)
Brian Brettschneider on X: "The pressure wave from the Hunga Tonga-Hunga Ha'apai eruption arrived here in Anchorage at 3:30 a.m. AKST. This is exactly 7 hours after the eruption. The volcano is
Ben Domensino on X: "Sydney observed atmospheric pressure fluctuations exactly 3 hours after the Hunga Tonga-Hunga Haʻapai volcano erupted near Tonga. So, the pressure wave covered 3,600 km in 3 hours, which
![The pressure/shock wave from the Tonga volcano passed through Melbourne just after 7pm : r/melbourne The pressure/shock wave from the Tonga volcano passed through Melbourne just after 7pm : r/melbourne](https://i.redd.it/pa0o7efa0ub81.jpg)
The pressure/shock wave from the Tonga volcano passed through Melbourne just after 7pm : r/melbourne
![Met Office on X: "It looks like our observation network has picked up on a second pressure wave from the #Tonga eruption moving across the UK https://t.co/fuMIPCNi1R" / X Met Office on X: "It looks like our observation network has picked up on a second pressure wave from the #Tonga eruption moving across the UK https://t.co/fuMIPCNi1R" / X](https://pbs.twimg.com/media/FJMIRJcX0AUdopJ.jpg:large)
Met Office on X: "It looks like our observation network has picked up on a second pressure wave from the #Tonga eruption moving across the UK https://t.co/fuMIPCNi1R" / X
![Bureau of Meteorology, Western Australia on X: "The #shockwave from the Hunga Tonga–Hunga Haʻapai volcanic eruption travelled at over 1000km/h and was recorded as a noticeable jump in atmospheric pressure across #Australia. Bureau of Meteorology, Western Australia on X: "The #shockwave from the Hunga Tonga–Hunga Haʻapai volcanic eruption travelled at over 1000km/h and was recorded as a noticeable jump in atmospheric pressure across #Australia.](https://pbs.twimg.com/media/FJMf1Z5XMAMMqhE.png)
Bureau of Meteorology, Western Australia on X: "The #shockwave from the Hunga Tonga–Hunga Haʻapai volcanic eruption travelled at over 1000km/h and was recorded as a noticeable jump in atmospheric pressure across #Australia.
![Tonga: Size of eruption put into perspective (InfoGraphics & Maps) | WeatherWatch - New Zealand's Weather Data & Alerts Authority Tonga: Size of eruption put into perspective (InfoGraphics & Maps) | WeatherWatch - New Zealand's Weather Data & Alerts Authority](https://weatherwatch-assets.s3.ap-southeast-2.amazonaws.com/wp-content/uploads/2022/01/15205308/Screen-Shot-2022-01-15-at-8.24.25-PM-1.png)