which omen will be found before rain ?

Here are some of the signs/omens that we might notice just before the rain drops or falls. Rainbows in the morning to the west indicates approaching rain, while a rainbow at sunset indicates that the rain is leaving and fair weather is on the way. Chickweed, dandelions, bindweeds, wild indigo, clovers, and tulips all fold their petals prior to the rain. Birds roost early and feed heavily before a rain or snow. An universal bustle and activity observed in ant hills may be generally regarded as a sign of rain. The ants frequently appear all in motion together and carry their eggs about from place to place. When bats return soon to their hiding places, and send forth loud cries, bad weather may be expected. Cats are said, when they wash their faces, or when they seem sleepy and dull, to foretell rain. The same is said of them when they appear irritable and restless, and play with their tails. Cattle, when they gambol about in their pastures more than ordinary, foreshow rain, and in general a change of weather. Dolphins or porpoises, when they come about a ship, and sport and gambol on the surface of the water, betoken a storm; hence they are regarded as unlucky omens for sailors. According to ancient fable, they formerly offered themselves in times of storm to convey shipwreeked mariners to the shore; but this is, of course, a story of mere human invention. Ducks--The loud and clamorous quackings of ducks, geese, and other waterfowl, are signs of rain. It is also a sign of rain when they wash themselves, and flutter about in the water more than usual. Flies, and various sorts of volatile insects, become more troublesome, and sting and bite more than usual before, as well as in the intervals of rainy weather, particularly in autumn, when they are very numerous, and often become a great nuisance. This observation applies to several sorts of flies. The horse-flies likewise of all sorts are more troublesome before the fall of rain, and particularly when the weather is warm. Source: http://www.merrycoz.org/museum/WEATHER.HTM