Contrail lobes

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Greg Gruner
Posts: 39
Joined: Sun Dec 13, 2015 7:36 pm
Location: Farnborough

Contrail lobes

Postby Greg Gruner » Fri Sep 30, 2016 8:19 pm

There was an interesting article on contrail lobes in the August edition of "Weather".
Interestingly, I came across a pronounced example of contrail lobes yesterday, while walking the dog at 1832 BST, and managed to take a photo, which I will attempt to attached.
The photograph was taken looking in a SW direction, and the contrail was oriented NW-SE. There must have been a strong SW-NE jet stream, because when I took the photo the contrail was less than 45deg elevation; within around 2-3 minutes it was directly overhead (carried "sideways" by the strong wind). A quick calculation would indicate that if the height was around 25,000 feet, the wind speed would have been >100mph.

contrail.JPG
Contrail lobes
contrail.JPG (33.81 KiB) Viewed 887 times

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Martin Rowley
Posts: 32
Joined: Sat Dec 12, 2015 8:32 pm
Location: West Moors, East Dorset

Re: Contrail lobes

Postby Martin Rowley » Sat Oct 01, 2016 2:00 pm

... thanks for posting that image: every time I see these 'lobes' I'm captivated by the apparent complexity of exactly how they form. The article you mention gives a creditable mechanism - but I wonder how many looking upwards on a fine day realise just how 'dynamic' is the atmosphere around these features.

Martin.
Martin Rowley
West Moors, East Dorset
Lat: 50deg 49.25'N, Long: 01deg 53.05'W
Height (amsl): 17 m (56 feet)
COL category: C1 overall/TRSHEUN=CC-A03-


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