Snowstorm Overlay

I'm working on an RPG exploration game, and it takes place in a winter environment.

What I'm aiming for is a blizzard overlay that restricts the user's vision with a hazy fog and snow particles. All of the tutorials I look at only explain weather particles for 2d sidescrollers, which isn't what I'm looking for. I'm looking for something like this (image below), but heavier and with snow particles instead of rain. Thanks!

The fog just looks like a transparent image, maybe with an additive blend. Weather particles are the same for top-down games as they are in platformers; only difference is they get destroyed/reset their position based on a random y coordinate instead of the bottom of the screen.