Birdwatch Note Rating
2024-05-05 21:34:21 UTC - HELPFUL
Rated by Participant: 0D1F823572EFB92CEC9C28FB970B1E13D61EA918213821B860168EF4223B4503
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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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