The level in the atmosphere at which a parcel of air reaches saturation.

Warm, humid air masses that form in tropical regions.

The twice-yearly occurrence (about March 21 and September 21) when the sun at its highest point crosses the equator.

The mass of air surrounding the Earth.

The average of a series of temperatures taken over a period of time, such as a day or a month.

A measure of the effect of wind in increasing the heat loss from exposed flesh.

A sudden shift in wind direction.

The direction from which the wind is blowing.

Empirical sayings and rhymes based on the experience and superstitions.

The conditions in the atmosphere at any given time.