Comment by JorgeGT

I agree with you, and it's very easy to test. Print 15 mixed weather icons on one sheet of paper and 15 red/green/orange circles in another. Show them to test subjects for 1-2 seconds, and ask them to assess the situation. Now repeat the test, but showing the sheets from two meters away. Our brain is really good at color cues, and especially red = danger is deeply wired into us!