That's why my framerate goes magically up, when alt-tabbing. Did not drive in the rain yet.This also happens if you Alt/Tab out & Alt/Tab back in. You will have particle physics beforehand but on flipping the game back up from the toolbar, they will be gone until you close it completely & restart.
You mean the storm mod by vlasovas? http://www.racedepartment.com/members/vlasovas.16322/There was a mod for F1 2016 that was very realistic. You could not see the car in front of you. Hope someone is working on it.