Just wondering if anyone registered the pressure wave from the Tonga Eruption on their weather station.  It would have appeared in the last couple of hours and was about a 2.5mb deviation from what I can gather.

Quite extraordinary to observe from an event over 10,000 miles away.

Yes, quite a lot of PWSs have picked it up - very distinctive signature.  I also recorded a wind gust at the same time that may have been related to it (been dead calm all day).

Yes, quite a lot of PWSs have picked it up - very distinctive signature.  I also recorded a wind gust at the same time that may have been related to it (been dead calm all day).

There’s a discussion on this event in the Science forum’s volcano thread. 

Yes, I picked it up here between 7 and 8pm.

It looks as if a second wave was experienced in the form of a sharp pressure drop at 01.44hrs here. A pattern echoed elsewhere around the globe by the looks of things.

Using Aberdeen and Folkestone as an example of pressure wave onset times. The first wave occurred in Aberdeen just before 7pm, in Folkestone 20 minutes later. The second wave was experienced in Folkestone first, Aberdeen 30 minutes later.

Two different waves probably from the the original eruption. Proof the world is round ! 

It looks as a second wave was experienced in the form of a sharp pressure drop at 01.44 hrs occurred here in Folkestone, a pattern echoed elsewhere around the globe by the looks of things.

Using Aberdeen and Folkestone as an example of pressure wave onset times. The first wave occurred in Aberdeen just before 7pm, in Folkestone 20 minutes later. The second wave was experienced in Folkestone first, Aberdeen 30 minutes later.

Two different waves probably from the the original eruption. Proof the world is round ! 

Here you go for part 2 Aberdeen-style:

It looks as a second wave was experienced in the form of a sharp pressure drop at 01.44 hrs occurred here in Folkestone, a pattern echoed elsewhere around the globe by the looks of things.

Using Aberdeen and Folkestone as an example of pressure wave onset times. The first wave occurred in Aberdeen just before 7pm, in Folkestone 20 minutes later. The second wave was experienced in Folkestone first, Aberdeen 30 minutes later.

Two different waves probably from the the original eruption. Proof the world is round ! 

Yes, I can see a pressure drop on my records. So, firstly a pressure rise and fall, then some fluctuations and the a drop and rise.

I've no idea why it was like that but could the second be where it met around the back of the earth and rebounded? Hang on, we are around the  back of the world! Relative to Tonga. So perhaps waves approaching from different direction? But why were they mirror image on the barometer trace?

Didn't see the sonic pressure wave, but looking at the last METAR recorded at Tonga.... Eeek!

NFTF 150505Z 31009KT 9999 TS FEW009 SCT016CB 28/26 Q1008 RMK VA CLD OVER TBU,RAIN ROCK

Never ever seen Rain Rock recorded before....

Did anyone hear anything relating to this in the UK, say a very deep rumble or boom if you're in a quiet rural area?

Did anyone hear anything relating to this in the UK, say a very deep rumble or boom if you're in a quiet rural area?

It seems the answer is no.

I was outside during daylight hours yesterday, in a quiet area, but no rumbles or booms (other than the occasional growl from a wolf telling her sister off!)

(The maths:

Tonga airport to Heathrow is 10,325 miles.

The speed of sound at sea level is 761.2mph at 15C, so just over 13½ hours.

The volcano blew at 04:14:45 GMT yesterday, so the boom (if it were audible) would have arrived around 5:45 PM - I was indoors by then, so didn't hear anything!)

"A massive volcanic eruption in Tonga that triggered tsunami waves has smothered the Pacific islands in ash, cut power and severed communications."

Pacific volcano: Ash-covered Tonga is like a moonscape say residents
https://www.bbc.co.uk/news/world-asia-60009944

Roger

The Hunga Tonga volcanic plume it seems, reached about 30 km into the stratosphere. The extra fine ash is now being spread around our planet.

Is there anyone here who can tell us or guess what effect this might have on global temperatures if any?

The Hunga Tonga volcanic plume it seems, reached about 30 km into the stratosphere. The extra fine ash is now being spread around our planet.

Is there anyone here who can tell us or guess what effect this might have on global temperatures if any?

Krakatoa and Tambora both reduced global temperatures by around 1C for a year or more

Do we know if this eruption was anywhere near this in scale though. I guess one could  pro-rate the effect

 

Krakatoa and Tambora both reduced global temperatures by around 1C for a year or more

Do we know if this eruption was anywhere near this in scale though. I guess one could  pro-rate the effect

 

Bit late to the party here, but I was discussing this elsewhere. My PWS here clearly picked up the first wave on Saturday evening at 7.45pm:

And the second wave on Sunday morning at 1.50am: