Wind shifting North to East and possibly through East to South. 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. Major changes in the temperature.
Distant objects seem to stand above the horizon.
Transparent veil-like cirrus clouds thicken, ceiling lowers. Hazy and sticky air. Rain may occur in 18-36 hours. Red sky to the West at dawn. No dew after a hot day.