Re: [weewx-user] When did the blast wave of the eruption "hit" your station?

[Les Niles]

I think you’re looking at the wrong time period.  The initial, direct wave arrived at the U.S. west coast — about 8400 Km from Tonga — around 4:00am Pacific time on Jan 15.  It should take 3-1/2 to 4 hours to travel the additional 4600 Km to your location.  That, plus the 4 hour time difference, would put it at around 12:00 noon your time on Jan 15, not Jan 16.  The long path wave should’ve arrived at your location something like 13-14 hours later, or shortly after midnight on Jan 16.  The second trip around the Earth of the initial wave would be something like 32-36 hours after the first arrival, or 20:00-24:00 your time on Jan 16.  What you’ve plotted here misses all of those.     -Les On 17 Jan 2022, at 11:58, morr...@gmail.com <morro...@gmail.com> wrote: Not sure I am really seeing it here in maritime Canada. We're about 13000 km from Tonga. Attached is a gnuplot command file and its output is: -- 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 weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/52D74246-A0DA-4F09-8CE2-8C146E76DE84%402pi.org.

The pressure pulse should have arrived about 12:00 local time. There is a little pressure increase at about 12:10. Use the command file to read from weewx database: rm barometer.png; sqlite3 weewx.sdb "select datetime, barometer from archive where datetime > 1642320000 and datetime < 1642384200 order by dateTime;" | gnuplot barometer.gnup and modify as needed for your own location. -- 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 weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/74084e3d-13ed-4039-ae5c-a5498a95751en%40googlegroups.com. -- 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 weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/52D74246-A0DA-4F09-8CE2-8C146E76DE84%402pi.org.

barometer.gnup
Description: Binary data

-- 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 weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/52D74246-A0DA-4F09-8CE2-8C146E76DE84%402pi.org.

-- 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 weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/52D74246-A0DA-4F09-8CE2-8C146E76DE84%402pi.org.