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Originally posted by nibiru
These were taken at 10:30 this morning
Does anyone know what could have caused it?
Was it just an unusual shape in the cloud or something to do with air pressure/heat or was it the beginning of a hurricane or something similar?
Is there anywhere on the net where i can get those radar maps for London?
That cloud "inside" hole is definitely virga.
Originally posted by HowardRoark
A distrail, short for dissipation trail, forms when an aircraft flies through a supercooled cloud. The cloud freezes due to the disturbing airflow created by the aircraft, as well as by the addition of plenty of freezing nuclei due to the aircraft's exhaust gases. Altocumulus is usually either frozen or supercooled and can show distrails. They are uncommon, especially the clear distrails. Distrails are usually not very long, since they usually show in altocumulus which is not at a cruising altitude of the aircraft (i.e. the aircraft is either descending or ascending through the cloud). In some cases a distrail may transform into a cloud hole: a large elliptical hole in altocumulus with virga in the middle.