With those jet trails that's what is going to happen. Those jet trails are formed by a cloud texture. With AS running, that cloud texture will not be called upon, hence no trails. In a METAR FC would be a funnel cloud or a tornado. For a funnel cloud I would predict that a t-storm texture would be used. In FS there is no way to show a tornado besides the strong winds. DU is the key for a dust storm. Again though there so no way to represent that in FS. The darker colored sky is formed from a feature in Sky World called V-Sky. What Chris did was design a high altitude, thin, blue cloud layer. It is not recommended that you use AS and V-Sky together or strange dark blue textures might appear over your scenery.Hope this helps,JimActiveSky Support

i had a violet sky from that

thanks for the help

No problem, that's why I am here!JimActiveSky Support