Sort of like the cold-water-warnings when it's a hot day in the Spring.
It's sunny and 80F, weather didn't mention anything of storms, but up comes a red warning, and of course you need to click on it to see what it is.
'Be aware that even though it is extremely warm outside, lakes, rivers, and streams are still very cold and can be dangerous for risk of hypothermia.'
Stupid thing is we swam in that 50-55F water as children and especially as teenagers when we were out doing teenager stuff. But not stuff they attribute to 'groups of teens' nowadays.
Well, we turned out OK. Everyone lived through very cold lake water on hot Spring days.