I did the same, since by the time I looked it had disappeared from the daily plot. I am 3300km from the volcano (East coast Australia). Unfortunately my station only updates the barometer value every 15 minutes, so there is only a single point at the "peak", a value back around average, then the next reading is the negative pulse. [image: Hunga-Tonga-volcano-barometer-trace.png] I've plotted about a week, to get an idea how much noise there usually is in the data. The first red arrow is the primary pulse and the second wave, a bit less than 30 hours later. I wondered whether the stuff indicated by the green arrow was more eruptions, but then realised it was a band of thunderstorms passing over..
I also looked at barometer plots from the Australian weather Bureau and did a crude plot of timing vs distance. From Norfolk Island to Perth gives us a range from 2000 and 7000 km from the volcano... [image: Hunga-Tonga-volcano-timing.png] Those results are only reported every 30 minutes, so the error bars would be rather big. On Monday, 17 January 2022 at 1:51:43 pm UTC+10 ln77 wrote: > I had to pull the data out of the database and plot it in a spreadsheet. > Taking a second look, I found the long-path pulse also. The second trip > around should be about 32-36 hours later; I haven’t looked for that yet. > > -Les > > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/347e66cc-b6a5-4449-a26a-19405f92446cn%40googlegroups.com.
