Cumulus Support

Altocumulus wrote: ↑Tue 18 Jan 2022 4:24 pm I wanted to check back through the graphs to see if I'd had a similar spike in the data, but on my localhost/charts display I have 12 hours of data on display. Only "All" is emboldened, the other 3 options are greyed out.

I assume there's a way to check back on previous days, or have I lost the opportunity without a lot of work - Historic Charts option is way too coarse.

I've looked back on our seismometer, but nothing appears to show beyond the background noise.

change your graph hours to 96 that will give you 4 days worth of data in the charts. settings, station settings, Graphs

Hi,
Just did some searching : Results here regards my earlier comments.
Interesting :
https://www.sciencedirect.com/science/a ... 4720300574
https://ui.adsabs.harvard.edu/abs/2018A ... A/abstract
https://watchers.news/2015/06/09/cosmic ... eruptions/
https://www.palmbeachpost.com/story/wea ... 426817007/
Kind Regards,

@BeaumarisWX: thanks, nice reading, It may take some time before comment because of difficulty level and not being available for some days
The second link gives me a 502 bad gateway error.

ConligWX wrote: ↑Tue 18 Jan 2022 8:44 pm

Altocumulus wrote: ↑Tue 18 Jan 2022 4:24 pm I wanted to check back through the graphs to see if I'd had a similar spike in the data, but on my localhost/charts display I have 12 hours of data on display. Only "All" is emboldened, the other 3 options are greyed out.

I assume there's a way to check back on previous days, or have I lost the opportunity without a lot of work - Historic Charts option is way too coarse.

I've looked back on our seismometer, but nothing appears to show beyond the background noise.

change your graph hours to 96 that will give you 4 days worth of data in the charts. settings, station settings, Graphs

Thanks Simon.

I had a 1 hPa spike rise at 1820 on Saturday against a general fall trend, and a 1 hPa dip at 0220 on Sunday.

some ... belated ... Western Australian observations.

The main eruption occurred at ~ 12:20 (15/01/2022) WA time (WST = +8 UTC). The first pressure wave arrived almost precisely 6 hours later (left arrow, black) at 18:20 WST. We are 6859 km from the volcano so that gives a speed of 1,143 km/hr. The barometric disturbance lasted a little over an hour.

The second arrow (from the left - red) at 17:10 (16 Jan) WST marks the pressure wave that came the long way around to Perth via Tonga's antipodean point ... 33,216 km, giving a speed of 1,145 km/hr (almost too close to the first estimate given the rough calculations being made here ).

I thought it might be interesting to stretch all this and "read the tea leaves" to see if the waves could be detected going around a second time (ignoring interference etc). The primary/direct wave seems to appear again at 06:10 (17 Jan ... right black arrow) ... that's 36 hours after it arrived the first time and equates to a speed of 1,113 km/hour (distance of a full lap of the earth is about 40,074 km). So it's seems to have slowed a bit.

As for the other side of the wave - for us the component headed ENE from Tonga and coming to us from the west, there is also a blip (right red arrow) at 04:10 on18 Jan which might be a second coming . This is 35 hours since that front arrived the first time and equates to a speed of 40,074 / 35 = 1,144 km/hr.

That's some shock wave, just slightly faster than the speed of sound and, it seems, comparable with estimates on Krakatoa.

Very interesting calculations - here in NE Scotland I have to use a bit of licence to see anything really beyond the first two waves.

just slightly faster than the speed of light

Or maybe speed of sound?

Just a little slower than sound

Flip - too early in the morning !!!!

Given that the pressure wave spreads in all directions from one point and the planet is more or less round, hypothetically is there a point where they all meet and what happens there?

apple8 wrote: ↑Fri 21 Jan 2022 5:46 am Given that the pressure wave spreads in all directions from one point and the planet is more or less round, hypothetically is there a point where they all meet and what happens there?

One would suspect, much like the tide and waves on the sea - in opposite directions, there's an amplification.

BeaumarisWX wrote: ↑Mon 17 Jan 2022 10:34 am I suppose I am going out on a limb here:
Though I suppose I am asking for your thoughts on this :
I have spent the better part of my life tracking Earthquakes and Cyclones, over that Time I have found that when we have CME's (Coronal Mass Ejections from the Sun), which some of us love (because it produces Auroras). That however through my monitoring over time I have found that in the event of a said CME, if it coincides with a Low Pressure System (better known as a Cyclone or even just that a Low Pressure System). It results in Volcanic Disturbance. I believe this is what happened with the Tonga Eruption.
You can see in the images attached, the significant Low Pressure System and the Eruption in Tonga. It all culminated around the same Time as the Arrival of the BoM Forecast CME. I am not a Scientist, but one who has observed Facts over time and I do believe in what the stats say.

It dose not always translate to a Volcanic Eruption, as in most cases it results in a maybe small Earthquake.

I came along a tweet describing a debunking of the correlation of full moon and earthquakes and remembered your post and my reaction. Although not completely what you were referring to it may be used as the line of debunking I was thinking about in my reply. You just need the data for the meteo

1) The tweet by Brendan Crowell
2) The Github repository of his code, data and findings.

Needless to say that correlating earthquakes/volcanic eruptions with lesser influences like the weather and solar flares etc... will be multitudes more difficult if it were only because - to start with - a question would be which weather/solar events are included and which are not.

Sorry, it is a long time ago but could not let it go by

This is a nice spin off of this eruption (holiday study) https://twitter.com/RARohde/status/1685971656198545408

The Hunga Tonga–Hunga Haʻapai eruption was unusually water rich (& sulfur poor), injecting ~150 million tonnes of water into the stratosphere, increasing global upper atmosphere water mass by ~15%.

As a powerful greenhouse gas, this water may have contributed to recent warming.

And probably to the massive downpours as well (my addition)

Interesting.....

on a nother note... here in Northern Ireland we have just had the wettest July month on record - since records began in 1836!

src: https://www.metoffice.gov.uk/about-us/p ... rn-ireland

ConligWX wrote: ↑Sun 06 Aug 2023 1:42 pm Interesting.....

on a nother note... here in Northern Ireland we have just had the wettest July month on record - since records began in 1836!

There’s a topic for that. All-time records can also include monthly ones.
viewtopic.php?t=2676

It’s perplexing how little discussion there is about the weather especially when you consider how wet and cool July was.