[NeedInfo]Persistent Contrails Picture Show

Here is my journey through France. Dijon / Lyon / Metz.

This was on 18th of May 2015.

Here is the exact route:

https://www.google.de/maps/dir/Dijo...e34b31458d0!2m2!1d5.04148!2d47.322047!1m0!3e0


Anyone got weather data (humidity / temperature etc.) for this case? Or know where to look for it?

Here is the gallery, have fun:



You can find upper-air relative humidity and temperature charts at instantweathermaps.com , with a three-day archive free of charge.

Here are the humidity charts for 9am, 12 noon and 3pm UTC (11am, 2pm and 5pm Central European Summer Time) on May 18:

06f7e9b064a3c604dbc58c0d4804a4b8.gif


910cd5cb0e529ff3b90c8e7b4d4d999b.gif

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As you can see there was an area of very high (>90%) humidity at the 300mb level (30,000 feet) over northeastern France at that time.

The temperature at 300mb was between -42.5C and -45C. For instance this is the chart for 1200 UTC:

31fde62683cf2fee73da9167ae6793b6.gif



The scale is only graduated to 2.5C but based on the position of the -42.5C and -45C isotherms I would estimate the temperature over Metz to be about -44C.

That suggests good conditions for persistent contrails, as seen on the Appleman chart:

0b67725889d6d2642253b93451a0dce6.jpg


Taking the temperature as -44C, the required RH for persistence is 90% at 300mb.
 
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