Date   

A-68A 'finger' breaking away.

geojohnt@...
 

Hello All,

Well, it appears the inevitable is happening from todays Metop image via EUMETCast attached.

Regards,
John.





Re: [GEO-Subscribers] A-68A turning again.

geojohnt@...
 

Hello Les,

Ah, I spoke too soon in my reply to Ferdinand just now.

Thanks for your link and further down there is a link are some amazing RAF photos of the iceberg.
It's 'big!'

https://www.bbc.co.uk/news/science-environment-55196220

Regards,
John.

+++++++++++++++++++++

-----Original Message-----
From: leshamilton2004 <les.hamilton@...>
To: GEO-Subscribers@groups.io
Sent: Tue, 22 Dec 2020 16:36
Subject: Re: [GEO-Subscribers] A-68A turning again.


Re: A-68A turning again.

geojohnt@...
 

Hello Ferdinand,

Another great image, thanks.

I'm surprised, I think, given the size of this iceberg and its vicinity, that we haven't seen any 'ground based' photos from ships or surveillance aircraft.

OK it's a remote part of the ocean but this is a big iceberg.

Regards,
John.

+++++++++++++++++++++++


-----Original Message-----
From: Ferdinand Valk <fvalk@...>
To: MSG-1@groups.io
Sent: Tue, 22 Dec 2020 16:18
Subject: Re: [MSG-1] A-68A turning again.

Yes John, that is correct. The fault line I refer to in the sar image is the same as the black line you see in your Metop and also in the attached Sentinel 3B image of today. The black in the colour image is the surface melt filling up the crack: this is the principal reason to suspect this line to give way first.
 
From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 15:42
To: MSG-1@groups.io
Subject: Re: [MSG-1] A-68A turning again.
 
Hello Ferdinand,
 
Thanks for the amazing image.
Such incredible detail and as you say bits floating nearby having broken off.
 
I agree about the cloud edge shadow line but enlarging todays Metop image to 300% although blurred appears to show(?) a black crack/line/area - which again could be shadow - at the base area of the finger, but it seems to correspond to the fault line in your image?
 
Regards,
John.

++++++++++++++++++++++++++
-----Original Message-----
From: Ferdinand Valk <fvalk@...>
To: MSG-1@groups.io
Sent: Tue, 22 Dec 2020 14:25
Subject: Re: [MSG-1] A-68A turning again.
There is indeed some calving at the pointed tip. Bits can be seen floating nearby. The line you see across the centre is caused by cloud. Most of the fault lines visible in the sar imagery run lengthwise through the slab; there is one major fault though at the root of the pointing finger that may well be the first to rupture.
 
Ferdinand
 
From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 12:55
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] A-68A turning again.
 
All,
 
Todays Metop image via EUMETCast shows the iceberg rotating again.
And, is the pointed bit breaking away?
 
Not sure about the line across the centre of the iceberg - cloud edge shadow?
 
Regards,
John.


Re: A-68A turning again.

Ferdinand Valk
 

Ernst,

 

Thanks for the details. I had already moved east and changed to landscape format here, but your suggestion is very useful.

Today the Copernicus hub was unavailable most of the time and so only now I got today’s data.

S1A_EW_GRDM_1SSH_20201222T071734_20201222T071834_035795_0430AC_13DF.SAFE

The crop above shows that the fault line I expected to rupture did precisely that today. A disconnect of the finger is clearly visible as well as the separation of the knuckles. Things unfold really fast!

 

Cheers,

Ferdinand

 

From: MSG-1@groups.io On Behalf Of Ernst Lobsiger via groups.io
Sent: Tuesday, 22 December, 2020 21:18
To: MSG-1@groups.io
Subject: Re: [MSG-1] A-68A turning again.

 

Ferdinand,
Users of my Sentinel-3A/B scripts,

an exeptional Sentinel-3B image from A68a today. It seems the iceberg will leave the sgeorgia300 area soon. The easiest way to follow will be an update of the personal areas.yaml with something like:
//snip

 


Re: A-68A turning again.

Ernst Lobsiger
 

Ferdinand,
Users of my Sentinel-3A/B scripts,

an exeptional Sentinel-3B image from A68a today. It seems the iceberg will leave the sgeorgia300 area soon. The easiest way to follow will be an update of the personal areas.yaml with something like:

sgeorgia300b:
  description: Iceberg A-68a (OLCI Sentinel-3A/3B)
  projection:
    proj: stere
    ellps: WGS84
    lat_0: -56.00
    lon_0: -36.00
  shape:
    height: 2000
    width: 2000
  area_extent:
    lower_left_xy: [-270000.0, -270000.0]
    upper_right_xy: [270000.0, 270000.0]

A result from today using this area is attached. Shape must always be in sync with area_extent and resolution of the instrument in use at SSP. Stere is conformal, grid lines must cross at 90°.

Cheers,
Ernst


Re: A-68A turning again.

Ferdinand Valk
 

Yes John, that is correct. The fault line I refer to in the sar image is the same as the black line you see in your Metop and also in the attached Sentinel 3B image of today. The black in the colour image is the surface melt filling up the crack: this is the principal reason to suspect this line to give way first.

 

From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 15:42
To: MSG-1@groups.io
Subject: Re: [MSG-1] A-68A turning again.

 

Hello Ferdinand,

 

Thanks for the amazing image.

Such incredible detail and as you say bits floating nearby having broken off.

 

I agree about the cloud edge shadow line but enlarging todays Metop image to 300% although blurred appears to show(?) a black crack/line/area - which again could be shadow - at the base area of the finger, but it seems to correspond to the fault line in your image?

 

Regards,

John.


++++++++++++++++++++++++++

-----Original Message-----
From: Ferdinand Valk <fvalk@...>
To: MSG-1@groups.io
Sent: Tue, 22 Dec 2020 14:25
Subject: Re: [MSG-1] A-68A turning again.

There is indeed some calving at the pointed tip. Bits can be seen floating nearby. The line you see across the centre is caused by cloud. Most of the fault lines visible in the sar imagery run lengthwise through the slab; there is one major fault though at the root of the pointing finger that may well be the first to rupture.

 

Ferdinand

 

From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 12:55
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] A-68A turning again.

 

All,

 

Todays Metop image via EUMETCast shows the iceberg rotating again.

And, is the pointed bit breaking away?

 

Not sure about the line across the centre of the iceberg - cloud edge shadow?

 

Regards,

John.


Re: A-68A turning again.

geojohnt@...
 

Hello Ferdinand,

Thanks for the amazing image.
Such incredible detail and as you say bits floating nearby having broken off.

I agree about the cloud edge shadow line but enlarging todays Metop image to 300% although blurred appears to show(?) a black crack/line/area - which again could be shadow - at the base area of the finger, but it seems to correspond to the fault line in your image?

Regards,
John.

++++++++++++++++++++++++++

-----Original Message-----
From: Ferdinand Valk <fvalk@...>
To: MSG-1@groups.io
Sent: Tue, 22 Dec 2020 14:25
Subject: Re: [MSG-1] A-68A turning again.

There is indeed some calving at the pointed tip. Bits can be seen floating nearby. The line you see across the centre is caused by cloud. Most of the fault lines visible in the sar imagery run lengthwise through the slab; there is one major fault though at the root of the pointing finger that may well be the first to rupture.
 
Ferdinand
 
From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 12:55
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] A-68A turning again.
 
All,
 
Todays Metop image via EUMETCast shows the iceberg rotating again.
And, is the pointed bit breaking away?
 
Not sure about the line across the centre of the iceberg - cloud edge shadow?
 
Regards,
John.


Re: A-68A turning again.

Ferdinand Valk
 

There is indeed some calving at the pointed tip. Bits can be seen floating nearby. The line you see across the centre is caused by cloud. Most of the fault lines visible in the sar imagery run lengthwise through the slab; there is one major fault though at the root of the pointing finger that may well be the first to rupture.

 

Ferdinand

 

From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Tuesday, 22 December, 2020 12:55
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] A-68A turning again.

 

All,

 

Todays Metop image via EUMETCast shows the iceberg rotating again.

And, is the pointed bit breaking away?

 

Not sure about the line across the centre of the iceberg - cloud edge shadow?

 

Regards,

John.


A-68A turning again.

geojohnt@...
 

All,

Todays Metop image via EUMETCast shows the iceberg rotating again.
And, is the pointed bit breaking away?

Not sure about the line across the centre of the iceberg - cloud edge shadow?

Regards,
John.


Re: Iceberg A-68A Dec. 21.

Ernst Lobsiger
 

On Mon, Dec 21, 2020 at 02:20 PM, Ferdinand Valk wrote:
Grease ice is present as a thin layer on the water, one step prior to forming pancake ice.
Ferdinand,

thanks for that education. I remember 1983 when we flew from Keflavik via Mestersvig all the way up to Station Nord my collegues from Denmark had a sort of SAR mounted on the left side of the C-130 fuselage. We followed the Greenland westcoast about 10km off shore and they were gathering radar signature data from pancake ice. So I know at least how the latter kind of ice looks like ...

Cheers,
Ernst


Re: Iceberg A-68A Dec. 21.

Ferdinand Valk
 

Ernst, I saw your question only now.

 

Yes, there is an explanation. If you look at the black and white tiff image it becomes a bit clearer. The bright white is the SAR signature of open water. The dark in the image shows so called grease ice which has the distinct appearance of oil slick in radar. Grease ice is present as a thin layer on the water, one step prior to forming pancake ice. In fact a collection of disconnected clumps of crystals without coherence which can therefore flow in currents eddies and the like.

 

Cheers,

Ferdinand

 

From: MSG-1@groups.io On Behalf Of Ernst Lobsiger via groups.io
//snip

It looks like the crash with the South Georgia shell opened an oil well :-). Any explanation?

Cheers,
Ernst

 


Re: MRTG Monitoring

Esko Petaja
 

Hello David

It work normally, even there is error

Br. Esko P


Re: Iceberg A-68A Dec. 21.

geojohnt@...
 

Hello Ernst,

Nice images.

It's no good, I'm going to have to get into Sentinel data!

Regards,
John.


-----Original Message-----
From: Ernst Lobsiger via groups.io <ernst.lobsiger@...>
To: MSG-1@groups.io
Sent: Mon, 21 Dec 2020 15:15
Subject: Re: [MSG-1] Iceberg A-68A Dec. 21.

Hi,

here are my Pytroll/Satpy versions.

Regards,
Ernst


Re: Iceberg A-68A Dec. 21.

geojohnt@...
 

Hello Hugo,

Oh great image.

The broken top bit of the ice berg appears to have turned 45 degrees from its joined position.
And there are some small icebergs to the east of South Georgia it seems in Metop images?

Regards,
john.




-----Original Message-----
From: Hugo <hvanruys@...>
To: MSG-1@groups.io
Sent: Mon, 21 Dec 2020 15:09
Subject: Re: [MSG-1] Iceberg A-68A Dec. 21.

Hello,

the image from Sentinel-3 has also a clear (almost) view on A68-A

https://www.flickr.com/photos/137270544@N02/50744157467/in/datetaken-public/

grts,

Hugo


Re: Iceberg A-68A Dec. 21.

Ernst Lobsiger
 

Hi,

here is a last SAR view of iceberg A68a and its child (d?). We had two 6 day series so far:

Images of A68a only: 2020.12.01 B / 2020.12.07 A / 2020.12.13 B / 2020.12.19 A (ascending)
A68a and S. Georgia: 2020.12.03 A / 2020.12.09 B / 2020.12.15 A / 2020.12.21 B (descending)

Not sure how long it takes now to enter a next Sentinel-1 SAR series of A68a only images.
It looks like the crash with the South Georgia shell opened an oil well :-). Any explanation?

Cheers,
Ernst


Re: Iceberg A-68A Dec. 21.

Ernst Lobsiger
 

Hi,

here are my Pytroll/Satpy versions.

Regards,
Ernst


Re: Iceberg A-68A Dec. 21.

Hugo
 

Hello,

the image from Sentinel-3 has also a clear (almost) view on A68-A

https://www.flickr.com/photos/137270544@N02/50744157467/in/datetaken-public/

grts,

Hugo


Iceberg A-68A Dec. 21.

geojohnt@...
 

All,

A couple of Metop false colour images from today.

Lucky with cloud again.

Regards,
John T.



Re: Iceberg A-68A moving away from South Georgia?

geojohnt@...
 

Hello Ferdinand,

Yes indeed, your images of the ocean floor around South Georgia some days ago threw new light on the icebergs possible/probable movement in the vicinity of land.

And yes, it's interesting and a privilege to have access to the 'eyes in the sky' in real time.

Best wishes,
John.

++++++++++++++++++

-----Original Message-----
From: Ferdinand Valk <fvalk@...>
To: MSG-1@groups.io
Sent: Sun, 20 Dec 2020 16:00
Subject: Re: [MSG-1] Iceberg A-68A moving away from South Georgia?

John,
 
As indicated in an earlier message, the ocean floor profile and the in-locu current most likely drives it south around South Georgia  and then up northeast. However, the radar image of today shows many tears in the ice and as yet it is impossible to estimate how deep these go. So it may drift around or it may disintegrate or break up before it reaches east.
In any case, nice to see things unfolding in real time.
 
Ferdinand
 
From: MSG-1@groups.io On Behalf Of geojohnt via groups.io
Sent: Sunday, 20 December, 2020 14:03
To: msg-1@groups.io; geo-subscribers@groups.io
Subject: [MSG-1] Iceberg A-68A moving away from South Georgia?
 
All,
 
Todays Metop VIS image shows the iceberg moving away from South Georgia?
Where will it go next?
 
Regards,
John T.
 
 


Re: Where has the Bracknell Overlay gone?

Ernst Lobsiger
 

On Sun, Dec 20, 2020 at 10:59 AM, Paul Gulliver wrote:
 
All,

I think Paul had the best address. I have tried others as well but had no luck with metoffice.gov.uk (as I had scripting in mind). These
links should be usable with wget(). Whether admins like it is another question. Maybe easier access if you register with metoffice.gov.uk?


www.wetter3.de
******************

12 hourly German (YYmmDDHH):

http://www1.wetter3.de/Archiv/DWD/20122000_DWD_Analyse.gif

http://www1.wetter3.de/Archiv/DWD/20122000_DWD_Analyse.gif


6 hourly U.K. (TODAY,branded "Archived by www.wetter3.de"):

http://www1.wetter3.de/Fax/00_UKMet_Boden+00.gif

http://www1.wetter3.de/Fax/06_UKMet_Boden+00.gif

http://www1.wetter3.de/Fax/12_UKMet_Boden+00.gif

http://www1.wetter3.de/Fax/18_UKMet_Boden+00.gif


www.wetterzentrale.de
**************************

It seems they have just 00 UTC (but in an archive YYYYmmDD00):

https://www.wetterzentrale.de/maps/archive/2020/bra/BRA_1_2020122000_45.png




https://www.weathercharts.org/ukmomslp.htm
****************************************************

LATEST FROM TODAY:

https://www.weathercharts.net/noaa_ukmo_analysis/PPVA89.gif

https://www.weathercharts.net/noaa_ukmo_analysis/PPVA89_fullsize.gif


6 HOURLY FROM TODAY SMALL SIZE (1179 x 864):

https://www.weathercharts.net/noaa_ukmo_analysis/previous/PPVA89_00z_last.gif

https://www.weathercharts.net/noaa_ukmo_analysis/previous/PPVA89_06z_last.gif

https://www.weathercharts.net/noaa_ukmo_analysis/previous/PPVA89_12z_last.gif

https://www.weathercharts.net/noaa_ukmo_analysis/previous/PPVA89_18z_last.gif


6 HOURLY FROM TODAY FULL SIZE (2358 × 1728) :

https://www.weathercharts.net/noaa_ukmo_analysis/previous/PPVA89_fullsize_00z_last.gif

https://www.weathercharts.net/noaa_ukmo_analysis/previous/PPVA89_fullsize_06z_last.gif

https://www.weathercharts.net/noaa_ukmo_analysis/previous/PPVA89_fullsize_12z_last.gif

https://www.weathercharts.net/noaa_ukmo_analysis/previous/PPVA89_fullsize_18z_last.gif



Have fun,
Ernst

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