[BIGLOOK]

Red sky at morning, a sailor takes warning...
Better forecast than anything I've ever heard on the radio . Navy weathermen stood on the Flying Bridge as look outs, unerringly forecasting squalls.

[mylife]

A red sky at sea is a bit different than a red sky inland on the mountains

Though you are correct, red painted on a mountain of clouds over water at dawn is a warning of things to come