If on land, leaves that grow according to prevailing winds turn over and show their backs. Temperatures far above or below normal for the time of year. Sharp, clearly defined edges to clouds. Unusually bright stars. Major changes in the temperature.
Sounds are very clear and can be heard for great distances.
Transparent veil-like cirrus clouds thicken, ceiling lowers. Hazy and sticky air. Rain may occur in 18-36 hours. Halo around the sun or moon. Increasing South wind with clouds moving from the West.