Changing two Game pieces on different maps at the same time

I have a 7 layer piece to state the weather for that game turn, Fair, Mud, Rain etc. One is on the Turn Track which is a drop down map. The other is on the playing map so that is always on view.
Is it possible to make it that when the piece on the turn track is changed the one on the map will change to the same display? It will have to be a simple / straightforward solution as my making of modules is limited to the Vassal engine, I know nothing of custom coding.
Thank you.

Yes, make the layer change using a Trigger that also sends a global key command to the other piece.

I can answer you with more detail, but I need to know something first. How are you setting the weather in the turn tracker window? And do you ever set the weather to a random number?