Astronomy, Photography and Weather

General Category => Weather & Atmospherics => Topic started by: JohnC on April 15, 2010, 07:38:57 am



Title: Iceland volcano - Ash Cloud to UK
Post by: JohnC on April 15, 2010, 07:38:57 am
I see that the ash cloud from the Icelandic volcano is heading right over the UK and airports are cancelling flights. I assume this will give us some attractive sunsets over the next few evenings.

http://news.bbc.co.uk/1/hi/uk/8621407.stm


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: JohnC on April 15, 2010, 08:01:59 am
Lifted this video from UKww - it's superb  http://www.nrk.no/nyheter/distrikt/nordland/1.7080795


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: paulster78 on April 15, 2010, 09:49:43 am
Cool video there John, yes widespread disruption for flights looks likely not just in the UK but for NW Europe in general. Volcanic ash and Jet engines are not a good mix.   The potential for some lovely sunrise/sunsets is definitely exciting and worth keeping a watch for!!

Did anyone else notice a fine layer of dust on surfaces yesterday? I had this on the car yesterday morning, I wonder is it related to the events in Iceland?


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: brianb on April 15, 2010, 10:53:04 am
Quote
Did anyone else notice a fine layer of dust on surfaces yesterday?
More than likely tree pollen at this time of year in this sort of weather. My nose says so too (atishoo!)


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: brianb on April 15, 2010, 11:04:14 am
Quote
the ash cloud from the Icelandic volcano is heading right over the UK and airports are cancelling flights
There is a danger from flying right through the ash cloud at a short distance - where the cloud is optically thick - but it takes a lot to stop a jet engine. The recorded examples of engine loss due to volcanic ash have been at ranges of tens of kilometres from the erupting volcano, not hundreds or thousands. Stopping flights in the UK is a gross over-reaction.

OTOH if if means no contrails blotting out the sky, I hope the volcano keeps erupting forever!


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: paulster78 on April 15, 2010, 11:14:22 am
Sorry to hear about the hayfever Brian, I have heard reports from all over Omagh of dust/ash deposits but its not the volcano, a huge gorse fire 10 miles away in Gortin is being blamed.


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: Paul on April 15, 2010, 11:36:15 am
Looking at the wind patterns and weather forecast, I would say that being up early for sunrise tomorrow morning is a must!


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: paulster78 on April 15, 2010, 01:23:39 pm
Just noticed sferics charts showing lightning over the area of the volcano and to the south suggesting it could be associated with a dense ash cloud and the formation of Pyrocumulus cloud?       http://andvari.vedur.is/athuganir/eldingar/ (http://andvari.vedur.is/athuganir/eldingar/)


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: Padraig OBrien on April 15, 2010, 06:26:46 pm
My flight to Paris on Sunday Morning might be in Jeopardy :-[ :'(


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: martinastro on April 15, 2010, 06:41:59 pm
Quite a major event - be on the alert for dramatic volanic ash sunsets and sunrises over the next few days!. I see possible ash today below the Sun during the afternoon. Camera at the ready...


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: markt on April 15, 2010, 10:39:31 pm
Great sunsets Dennis!  8)


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: JohnC on April 15, 2010, 11:03:27 pm
Noted that, Paul I'm .Just turning in after the political debate and will check sunrise time but the bulk  ad thickest of this ash cloud is heading over Scandinavia but as Dennis has shown us he's had a superb sunset. I did venture out hoping to see what Dennis saw but it was just a regular sunset.

Great shots there Dennis.


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: brianb on April 16, 2010, 12:46:14 pm
Grrr. Partial listing af airspace restrictions, two aircraft over so far & upper air which was gin clear whilst the filght ban was in place is already filling with contrail derived cirrostratus.

(http://i885.photobucket.com/albums/ac55/bjb11213/2010/April/16/IMG_7925.jpg)
2010 Apr 16, 1112 UT. Looking W from my site.


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: rjgjr on April 16, 2010, 03:51:55 pm
Beautiful colors in those sunset images Dennis!


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: martinastro on April 16, 2010, 07:40:32 pm
Excellent Dennis, and very well taken, lovely scenes there!  :)

It was strange to see not a single plane last night at all - that's a new experience for me. The stars looked incredible too, and if it were not for the sats crossing the sky it would have been like how the ancients saw the stars with nothing manmade up there at all - quite an experience.


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: Paul on April 16, 2010, 08:47:45 pm
Here's an interesting fisheye shot I took this morning - quite a bit of flare from the Sun, but not a single contrail!

(http://paulni.co.uk/images/nocontrails100416.jpg)


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: scott86 on April 17, 2010, 01:52:38 am
just a quick snap taken from my friends phone at stoneyford lake on the evening of the 15th

(http://i40.tinypic.com/34fxzm0.jpg)


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: martinastro on April 17, 2010, 10:35:51 pm
Volcanic sunset on April 16th looking west over the Sperrin Mountains from Maghera. The Sun sports a faint 15 degree pillar. Within the vicinity of the Sun are 'cirrus-like' strips of cloud which looked like NLC bands visually, these have been visible for the last two evenings. Those bands are ash clouds which have been confirmed by atmospheric expert Les Cowley. They are located in the Troposphere. These strips were complimented by a 1.5 hour, orange, low elevation afterglow.

(http://i42.tinypic.com/2jb8kzq.jpg)

(http://i44.tinypic.com/102qlvp.jpg)

(http://i42.tinypic.com/17xuom.jpg)


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: markt on April 18, 2010, 02:17:15 am
Great pictures all of you!

I saw similar clouds to like what you described and showed this evening.  This could be very interesting, I can't see the volcano and its effects disappearing any time soon, which means more volcsnic sunsets for a while yet! :)


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: JohnC on April 18, 2010, 08:06:11 am
Quote
the ash cloud from the Icelandic volcano is heading right over the UK and airports are cancelling flights
There is a danger from flying right through the ash cloud at a short distance - where the cloud is optically thick - but it takes a lot to stop a jet engine. The recorded examples of engine loss due to volcanic ash have been at ranges of tens of kilometres from the erupting volcano, not hundreds or thousands. Stopping flights in the UK is a gross over-reaction.

OTOH if if means no contrails blotting out the sky, I hope the volcano keeps erupting forever!



I agree,Brian OTT.  What I don't understand is why flights to Europe or even the US can't take off and stay at ,say, 15-17,000 feet (the ash ,I believe, is at 20,000 feet) and then when clear of the zone climb  to the 35,000 feet that the Trans-Atlantic flights travel at, same coming in, get well under the cloud,15,000 feet doesn't pose a danger I wouldn't have thought.What about the planes that us leave Southampton stay quite low and land at Dijon or even further south. Maybe it's my age but I've lost all confidence in authorities whatever body they are.


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: markt on April 18, 2010, 10:35:28 am
It's one of those no win situation for the authorities i'm afraid.   They play the safety card like they are doing now and ground flights which annoys the heck out of people, however if they allow flights to resume and a plane comes down / suffers engine damage then they will get hauled over the coals for letting planes take off...  They can't win.   ::)



Title: Re: Iceland volcano - Ash Cloud to UK
Post by: paulster78 on April 18, 2010, 11:07:36 am
Two images from the evening of the 16/4/10 showing the same possible ash clouds as in Martin's shots and the faint sun pillar. These are from the same shot and have been cropped.  Obviously there is ash in the atmosphere but it must not be at the right elevation or significant quantity out to my west as sunsets have been nothing out of the ordinary-buts there plenty of time yet in the days ahead and Eyjafjallajoekull continues to erupt. By the way has anyone tried to pronunce Eyjafjallajoekull ??   What a mouthfull!! ;D

(http://i613.photobucket.com/albums/tt215/paulster78/Weather%202010/Sunset16-4-10.jpg)

(http://i613.photobucket.com/albums/tt215/paulster78/Weather%202010/Sunset216-4-2010-1.jpg)


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: brianb on April 18, 2010, 11:19:36 am
Quote
By the way has anyone tried to pronunce Eyjafjallajoekull ??
Eye-slandic volcano. I daren't even try to spell it.


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: JohnC on April 18, 2010, 05:27:21 pm
Lovely colours,there's probably ash in there somewhere.

I had this link sent to me-some wonderful eruption photos.  http://www.swisseduc.ch/stromboli/perm/iceland/eyafallajokull_20100416-en.html


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: markt on April 18, 2010, 07:05:57 pm
Very nice pics in that link John, thanks for sharing! :)


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: martinastro on April 18, 2010, 07:48:10 pm
Lovely images Paul, definitely volcanic ash clouds in there in the form of those NLC-type strips.

Looking forward to seeing what this evening's sunset will produce.


Title: Re: Iceland volcano - Ash Cloud to UK
Post by: martinastro on April 19, 2010, 05:56:36 pm
Volcanic ash clouds in the sky here all day long, with halo too. They look like NLC bands and herringbone structure. Watch out this evening.