Verfeil 2013, Unusual cloud-like contrails

Summary

On February 17, 2013, several witnesses in a car observed a phenomenon in the clear sky that looked like airplane contrails. Two photographs were included with the testimony, showing something unusual: many contrails and some that were not straight. This was explained by particular weather conditions that day. A newly formed east wind generated strong high-altitude winds, which quickly deformed the contrails. Additionally, the temperature and humidity were ideal for contrails to persist for a long time. The case was classified as "B", meaning a very likely observation of numerous and deformed airplane contrails due to the east wind.