I lived in much smaller mountains. Our house was just by a river about a mile from the start of the mountain side. Whenever there was a lot of rain up the moun

I lived in much smaller mountains. Our house was just by a river about a mile from the start of the mountain side. Whenever there was a lot of rain up the mountains, my parents would keep watch during the night as it takes as little as 20 minutes from the start of rain to the wall of water reaching our location.