Originally Posted by Harry Palmr
Ah jasus the more options the greater the confusion. Weather warnings should be as simple and clear as possible. Words actually work best in this regard - the problem with Yellow/Orange/Red is not the words it's how and when they are used. It's best to assume the worst and then change to a lesser level if appropriate.
With respect, I don't think it helps to redefine a problem we've all discussed for years. It'd be good if people proposed some alternatives.
By the way, this kind of matrix chart would be very easily translated into words:
"Very high chance of orange level impacts, with a medium chance of lower yellow level impacts."