THE late afternoon glow of this sunset above Skelmanthorpe shows the amount of planes flying overhead.
Reader Brenda Booth, who lives in the village, was amazed at how many vapour trails there were.
“The recession obviously isn’t affecting air travel very much judging by the amount of vapour trails,’’ she said.
But why is it that on some days vapour trails vanish quickly while on others they seem to stay in the air for ages?
Huddersfield meteorologist Paul Stevens explains: “Jets generally cruise between 28,000 and 35,000 feet where the air is super cooled at below -40°c and super cooled water can exist or ice crystals.
“These clouds are the wispy cirrus type you see high up that appear to move slowly, but they actually move quite fast. It’s only because they are so far away they appear to move slowly.
“As the jet engine is powered by a carbon fuel, as it burns it emits hot gases.
“A proportion of the gases are in the form of water vapour or very small particles of water. This hot engine vapour quickly cool in the cold temperatures and condense into lines of cirrus clouds – or artificial clouds, if you like.’’ He added: “Conditions at this altitude also change like it does lower down so sometimes the air is warmer or it is windier or dryer with less moisture so vapour trails either evaporate more quickly so disappear soon after forming and mix in the fast moving air and evaporate or simply just sit there in light air and gradually decay.’’
We are always looking for submissions for Picture Of The Week. Send entries to email@example.com or you can drop them in the post to Picture of the Week, Features, Huddersfield Daily Examiner, Queen Street South, Huddersfield, HD1 3DU.