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How do I create a "Push Back the Storm" FX?

I’m making a top-down game where the player has to push back a storm by creating anti-weather devices.

When the player starts, there’s a device next to them that holds back the storm:

https://forums.unrealengine.com/filedata/fetch?filedataid=116333&type=thumb

When they craft a new device, the storm is pushed back in real time to a larger shape:

https://forums.unrealengine.com/filedata/fetch?filedataid=116334&type=thumb

How can I create an FX that I can shape in real time so I can have the devices “push back” the storm?