A Better Weather Solution
From what I've heard from the stream I think you're overthinking weather. Here is what a friend and I have conjured up that makes more sense that your latest idea.
The most damage Bronze weather should be able to inflict per turn is 2. Rain should damage one of the lowest units by 2. Fog should damage one of the highest units by 2. And Frost should damage up to 2 units in a row by 1.
The most damage Silver weather should be able to inflict per turn is 4. White Frost already works written as-is. And Skellige Storm should inflict 2,1 and 1. Storm would have the distinction of being able to damage 3 units a turn on a single row.
And then the most damage Gold weather should be able to inflict per turn is 6. Which is what RNR and Drought do already!
Q.E.D. Perfect symmetry.
From what I've heard from the stream I think you're overthinking weather. Here is what a friend and I have conjured up that makes more sense that your latest idea.
The most damage Bronze weather should be able to inflict per turn is 2. Rain should damage one of the lowest units by 2. Fog should damage one of the highest units by 2. And Frost should damage up to 2 units in a row by 1.
The most damage Silver weather should be able to inflict per turn is 4. White Frost already works written as-is. And Skellige Storm should inflict 2,1 and 1. Storm would have the distinction of being able to damage 3 units a turn on a single row.
And then the most damage Gold weather should be able to inflict per turn is 6. Which is what RNR and Drought do already!
Q.E.D. Perfect symmetry.