In the morning, when the sun is in the east, the shower and its rainbow are in the west. As the weather in the mid-latitudes of the northern hemisphere moves mostly from west to east, the morning rainbow indicates that rain is moving from the west toward the observer. When the stars begin to huddle, the earth will soon become a puddle. When clouds increase, whole areas of stars may be hidden by clouds with groups of stars, still in the clear sky, seem to huddle together. The clouds are increasing, so the chance of rain is increasing too.
Swallows flying low indicate the air pressure is dropping.
Falling pressure may affect the digestive system of cows, making them less willing to go to pasture, causing them to lie down. Static electricity may increase the grooming activities of cats. The calls of some birds, including crows and geese, become more frequent with falling pressure. Deer and elk react to wind and air pressure by coming down from mountains and seeking shelter. Some species from rabbits to rattlesnakes to certain kinds of fish feed more before a storm so they can seek shelter.