Dusky Clouds.
Dusky or tarnish-silver colored clouds indicate hail.
Disperse.
When clouds, after a rain, disperse during the night, the weather will not remain clear.
Dark Sky.
If the sky becomes darker without much rain and divides into two layers of clouds, expect sudden gusts of wind.
Dark clouds in the west at sunrise indicate rain on that day.
Equinox.
If it blows in the day it generally hushes toward evening.
The vernal equinoctial gales are stronger than the autumnal.