Birdwatch Archive

Birdwatch Note Rating

2024-05-06 01:35:54 UTC - HELPFUL

Rated by Participant: 3FD84FC2F147661FE9023F933D17493E041A5F9ED78C9261234BB8C70C98D122
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Original Note:

The temperature at the height where contrails form is typically below -40 degrees Celsius. Contrails will persist for as long as the surrounding air is ice supersaturated, that is, the humidity via greater than 100% relative to ice, or about 60-70% relative to water. https://scool.larc.nasa.gov/pdf/Contrail_ID_Chart_English_2013_v18_copy.pdf

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