Mare's Tails a Sign of Rain:
We grew up on boats throughout my childhood, but my Dad was more than a boater for he knew how to read the weather, and that ability made him a Mariner. He could tell by barometer readings and wind direction what was going to happen that day. But what I thought was cool was when He would point to the sky and say "Look, Mare"s Tails, it's going to rain in 36 hours"; and sure enough it would be raining in 36 hours.
Pictured are Mare's Tails I saw this morning. And mark my Dad's words it will be raining in 36 hours.