I've just come back to the game after a two-month absence and it seems the Advanced Strategy box on the Next Race page is different. I remember that it used to be based on how many laps it was raining during the race before switching to wet weather tires, but now seems to be based on the amount of "standing water" on the track surface.
Has this been changed in the last two months, and if so, how are we supposed to tell how much standing water is on the track?