Multiple parallel contrails near Canberra

Trailspotter

Senior Member.

Spectacular multiple parallel contrails were seen over Canberra in the morning of Friday , November 21, 2014


http://www.canberratimes.com.au/act...s-live-friday-november-21-20141117-3khtu.html


Contrails over Canberra on Friday November 21, 2014 Photo: Graham Tidy


A cover photo of these contrails on the ABC News FB page prompted a flurry of angry comments from local chemtrail proponents.

https://www.facebook.com/abcnews.au...72924719987/10153447215639988/?type=1&theater

The photos apparently were taken at different times between 8 AM and 10 AM of local time (21:00-23:00 UTC of the previous day November 20). FR24 playback shows that air traffic on Sydney-Melbourne route is arranged into two single files, with flights from Melbourne passing northwest of the Australian capital and flights from Sydney passing southeast of it.
Screen shot 2014-11-24 at 23.22.39.png
The morning local traffic to Melbourne is joined by the transcontinental flights from Los Angeles.
Screen shot 2014-11-24 at 23.24.58.png

The photos are taken in the eastern direction toward the morning sun and the Sydney to Melbourne file. A random flight track from this file displayed on Google Earth matches the direction of the trails in the photos, including the trails from the past accidentally captured by a Google StreetView car.
Canberra Contrails.jpg

Comparison of the EOSDIS Worldview Terra and Aqua images of the southeastern Australia on the date shows differences in the cloud coverage consistent with westerly wind blowing across the common flight path. The presence of crosswind explains the formation of multiple parallel contrails by the planes following the same track. The shorter interval between the planes, the closer their contrails to each other.

Update:

A new flickr photo of known time and location allowed the identification of the flight for the nascent top contrail as VOZ814. Several other flights ahead of it have also been allocated to their respective contrails (red numbers). The time intervals (in minutes) between these flights passing Canberra are shown in orange between their contrails.
Canberra contrails flights and timing.png
 
Last edited:

Hama Neggs

Senior Member.
Wow. Same old hysterical bunk, and Russ Tanner still claiming that HBTF engines don't make contrails. People saying the same nonsense things, like "Contrails are water vapor which freezes and then quickly melts away" and "It's really easy to figure out! You open.flight aware or flight tracker and can see that these lines are not from a commercial airliner."

They just don't seem to utilize the same logic as I do.
 
Last edited:

Trailspotter

Senior Member.
Wow. Same old hysterical bunk, and Russ Tanner still claiming that HBTF engines don't make contrails. People saying the same nonsense things, like "Contrails are water vapor which freezes and then quickly melts away" and "It's really easy to figure out! You open.flight aware or flight tracker and can see that these lines are not from a commercial airliner."

They just don't seem to utilize the same logic as I do.
I have noticed on many occasions that a contrail-related publication in the online outlet of mass media usually attracts many 'chemtrail' comments, but in this case there is evidence of the organised flash-mobing the ABC News site:
Screen shot 2014-11-25 at 09.51.04.png
https://www.facebook.com/AustraliansAgainstChemtrails/posts/799001136813076
 
Last edited:

Trailspotter

Senior Member.
There is another photo of these contrails on flickr:
https://www.flickr.com/photos/will_e_clickit/15233803964

It has been taken at the Bruce campus of Canberra Institute of Technology at 08:22 AEDT (21:22 UTC of the previous day, November 20). In combination with FlightAware data, it allows the identification of the nascent top contrail as from flight VOZ814:
VOZ814 track match.jpg

The contrails of the seven earlier flights from Sydney to Melbourne have also been allocated.
Canberra contrails flights and timing.png
All these flights (red numbers) followed the same course of 235° and all but one did it at the same altitude of 38,000 ft. The time intervals between the flights (in minutes) were taken from FlightAware data and displayed between the corresponding contrails (orange numbers). Selected data are in the table below:
Screen shot 2014-11-25 at 23.30.41.png

The contrails in this photo make the same 'barcode' as in the first and third OP photos, suggesting that all three photos were taken at about the same time. There are two points that should be noted:
1) In spite of the short two-minute interval between QFA407 and VOZ810, their contrails are quite apart. This is because QFA407 was flying closer to Canberra than the other planes.
2) TGW213, the only plane in the group that was flying lower at 36,000 ft, has left a thinner, broken contrail (OP photo #1).

PS OP has been updated with this information.
 
Last edited:

Mick West

Administrator
Staff member
That's excellent work, with the "barcode" spacing. I would think that the spacing would remain very consistent for all trails at the same altitude. Eventually there might be some distortion as earlier trails sink.
 
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