Everybody -

Some pictures from this morning showing a distrail and altocumulus.
Slightly tweeked in Irfanview to bring up the blue.

Wallsend EastCam:
http://llandru.servehttp.com/300905/ispy2266.jpg
http://llandru.servehttp.com/300905/ispy2267.jpg
http://llandru.servehttp.com/300905/ispy2268.jpg
http://llandru.servehttp.com/300905/ispy2269.jpg - distrail forming and
moving n. --- s. dates and times (GMT / UTC/ z) on pictures

http://llandru.servehttp.com/300905/distrail.jpg in patchy altocumulus
duplicatus.
http://llandru.servehttp.com/300905/09300002.jpg - looking S. Patchy
altocumulus opacus / lenticularis. The crane is the Swan Hunter shipyard.
http://llandru.servehttp.com/300905/09300007.jpg - looking south & up.
Patchy altocumulus opacus / lenticularis.

Les
--
Les Crossan,
Wallsend, Tyne & Wear
54.95N 1.5W
Home of the Wallsend StormCam and the Backup USW FAQ -
www.uksevereweather.org.uk

"Les Crossan" wrote in
message o.uk...
Everybody -

Some pictures from this morning showing a distrail and altocumulus.
Slightly tweeked in Irfanview to bring up the blue.

Fascinating pictures. Would you mind explaining to an ignoramus like me what
exactly a distrail is, though? Or point me to a website that explains? I'm
sure I've seen something like that before and didn't know what I was looking
at.

Thanks.

ally

a l l y wrote:
"Les Crossan" wrote in
message o.uk...

Everybody -

Some pictures from this morning showing a distrail and altocumulus.
Slightly tweeked in Irfanview to bring up the blue.


Fascinating pictures. Would you mind explaining to an ignoramus like me what
exactly a distrail is, though? Or point me to a website that explains? I'm
sure I've seen something like that before and didn't know what I was looking
at.

Thanks.

ally


A distrail (DISsapation TRAIL) is when an aircraft flies through cloud
and the hot exhaust gases and / or the turbulence cause the cloud layer
to break up, glaciate (and cause a trail of ice crystals) or evaporate.
They aren't really that common.

There are some more here but I think the top right ond centre left are
shadows and not distrails.

http://www.geocities.com/milo702000/.../distrails.htm

Les
--
Les Crossan,
Wallsend, Tyne & Wear
54.95N 1.5W
Home of the Wallsend StormCam and the Backup USW FAQ -
www.uksevereweather.org.uk

a l l y wrote:
"Les Crossan" wrote in
message o.uk...

Everybody -

Some pictures from this morning showing a distrail and altocumulus.
Slightly tweeked in Irfanview to bring up the blue.


Fascinating pictures. Would you mind explaining to an ignoramus like me what
exactly a distrail is, though? Or point me to a website that explains? I'm
sure I've seen something like that before and didn't know what I was looking
at.

Thanks.

ally


The usw FAQ has a section on it too: section 2a:11 ( dissipation trails).

http://homepage.ntlworld.com/booty.weather/FAQ/2A.htm
http://llandru.servehttp.com/uswfaq.htm#2A

Les
--
Les Crossan,
Wallsend, Tyne & Wear
54.95N 1.5W
Home of the Wallsend StormCam and the Backup USW FAQ -
www.uksevereweather.org.uk

Les Crossan wrote:


A distrail (DISsapation TRAIL) is when an aircraft flies through cloud
and the hot exhaust gases and / or the turbulence cause the cloud layer
to break up, glaciate (and cause a trail of ice crystals) or evaporate.
They aren't really that common.

There are some more here but I think the top right ond centre left are
shadows and not distrails.

http://www.geocities.com/milo702000/.../distrails.htm


Even rarer is when the cloud disperses and all that's left is the distrail!
Sounds daft but I saw this happen a while ago. A plane passed through a
sheet of cloud - can't remember whether it was Ac or Sc - and formed a
distrail. The turbulence thickened the cloud on either side of the cleared
track. The original sheet of cloud was dispersing and before long all that
was left was the pseudo-contrail composed of the thickened cloud.

--
Graham Davis
Bracknell

On Sat, 01 Oct 2005 09:15:48 +0100, Graham P Davis wrote in


A distrail (DISsapation TRAIL) is when an aircraft flies through cloud
and the hot exhaust gases and / or the turbulence cause the cloud layer
to break up, glaciate (and cause a trail of ice crystals) or evaporate.
They aren't really that common.

There are some more here but I think the top right ond centre left are
shadows and not distrails.

http://www.geocities.com/milo702000/.../distrails.htm


Even rarer is when the cloud disperses and all that's left is the distrail!
Sounds daft but I saw this happen a while ago. A plane passed through a
sheet of cloud - can't remember whether it was Ac or Sc - and formed a
distrail. The turbulence thickened the cloud on either side of the cleared
track. The original sheet of cloud was dispersing and before long all that
was left was the pseudo-contrail composed of the thickened cloud.

Back in the spring of 2004, I photographed what appeared to be both
contrails and distrails at the same time, and posted here then It is
conceivable what appears to be a distrail is a shadow, but the effect is
quite unusual.

http://www.mtullett.plus.com/17-may-2004/

--
Mike 55.13°N 6.69°W Coleraine posted to uk.sci.weather 01/10/2005 08:26:37 UTC

"Les Crossan" wrote in
message .uk...

A distrail (DISsapation TRAIL) is when an aircraft flies through cloud and
the hot exhaust gases and / or the turbulence cause the cloud layer to
break up, glaciate (and cause a trail of ice crystals) or evaporate. They
aren't really that common.

Ah. I see. Thanks. I've found a photo I took in May 2004: d'you think this
is a distrail? I had no idea what it was at the time.
http://www.marshallmcgurk.co.uk/stuf...m/distrail.jpg

ally

a l l y wrote:
"Les Crossan" wrote in
message .uk...

A distrail (DISsapation TRAIL) is when an aircraft flies through cloud and
the hot exhaust gases and / or the turbulence cause the cloud layer to
break up, glaciate (and cause a trail of ice crystals) or evaporate. They
aren't really that common.


Ah. I see. Thanks. I've found a photo I took in May 2004: d'you think this
is a distrail? I had no idea what it was at the time.
http://www.marshallmcgurk.co.uk/stuf...m/distrail.jpg

ally


Something has caused the thinning of the cirrostratus sheet. I'd say
that was a distrail of sorts, anybody else?

Les
--
Les Crossan,
Wallsend, Tyne & Wear
54.95N 1.5W
Home of the Wallsend StormCam and the Backup USW FAQ -
www.uksevereweather.org.uk