Of course, the "sailor" version doens't have anything to do with the weather. The 'red sky at night' part means there's a riot in town. The townies are mad at the sailors for stealing all their women and the sailors are burning the downtown area. The 'red sky at morning' part means that the shore patrol has come with their paddy wagons with the flashing red lights and are hauling off any sailors stupid enough to hang around that long.