"© George Anderson

Wokingham, England, United Kingdom of Great Britain and Northern Ireland

Latitude: 51° 25' 4'' N

Longitude: 0° 51' 48'' W

12 April 2015 0736 (Local Time)
Camera direction: towards NE

Image P/S code: P.1.15

Image I.D.: 5201

CL = 0, CM = 0, CH = 1


Aircraft condensation trails (contrails): Cirrus Homogenitus

Persistent aircraft condensation trails (contrails) cross the sky over southern England, UK. These are classified as Cirrus Homogenitus.

Because new or recently formed aircraft condensation trails may display a variety of transient shapes (seen at 2, 3 and 4), no species, varieties or supplementary features are used in the classification."
https://cloudatlas.wmo.int/imgviewer-5201.txt


"Aircraft condensation trails(Section 2.1.3.6.3)
Aircraft condensation trails (contrails) that have persisted for at least 10 minutes will be given the name of the genus, Cirrus, followed only by the special cloud name “homogenitus”, so a contrail will be known only as Cirrus homogenitus. As new, or recently formed aircraft condensation trails may undergo a fairly rapid state of change and may display a variety of transient shapes, no species, varieties or supplementary features will be applied to the name."
https://cloudatlas.wmo.int/aircraft-condensation-trails.html