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Originally posted by Zaphod58
Originally posted by MountainLaurel
Still would not explain what I'm seeing in CA, with warm weather and generally low humidaty here.
That's just it though. Ground level conditions don't mean anything when you're talking about 30,000+ feet. I came through Arizona yesterday afternoon, where the humidity was low, and the temp was in the 90s (according to my truck sensor), and watched a couple of dozen persistent contrails being left behind. Including one that started from "nowhere" made a dogleg, and persisted for a way before stopping. Just normal contrails. Really pretty at sunset.
Originally posted by Aloysius the Gaul
US Statistics in fuel use by different types of transport per-annum since 1960