Fairy morning

Fairy morning

Expl... - "When the dew is on the grass, rain will never come to pass; When the grass is dry in the morning light, look for rain before the night. "What's the science behind this old aphorism? Is the amount of dew in the morningAs a matter of fact, this saying is roughly accurate, at least in the spring and fall, but the reason it works is more complicated than we might initially think.Why It's Slightly TrueWe might imagine that the work works on a dewy morning, much of the atmosphere's moisture has already been condensed as dew, This is not the caseThe amount of water in dew is usually much less than what falls in a storm, and besides, that dew is likely to evaporate back into the atmosphere as the morning progresses.Dew and feverAs it turns out, the formation of dew is linked to the amount of cloudiness in the sky at night.On a clear night the ground cools When the ground gets cool enough, dew forms, like beads of condensation on a can of cold soda.If the sky is cloudy at night, however, the Earth's surface does not cool as much Some of the heat radiates in space, but much of it bounces off the cloud layer and goes back into the ground. If there are lots of clouds, the ground will not get enough to form dew The saying works because, all those nighttime clouds will also cause rainstorms during the coming day.