This news report is from 1980.It’s based on this research paper:EFFECT OF CONTRAIL CIRRUS ON SURFACE WEATHER CONDITIONS IN THE MIDWEST. It’s interesting because it shows that back in 1980 people were noticing contrails persisting and spreading to cover the whole sky. At that point people had even noticed it contributed to increased cloudiness.This is …
There’s a great new series on the BBC in the UK: Britain From Above, that shows how various things look from a high perspective, using very interesting visualization techniques. One of the most interesting (for me) was an episode that showed all the air traffic in UK airspace in a 24 hour period. That involved …
Sometimes planes leave contrails, and sometimes they don’t. It depends on the weather, and specifically it depends on the weather at altitude. It’s also very localized. A plane might leave a trail in one region, and another plane a mile away might not leave a trail. NASA have put together a contrail forecast page that …
A question that comes up with some consistency is based on the observation that some planes in the sky leave trails that persist and spread, and other planes, in the same sky, leave short-lived trails, or no trails at all. This difference is often used as evidence of the “chemtrail” theory, which states that the …
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