Weather - The state of the atmosphere at a specific time and place. Weather is reflected by variables of temperature, moisture, wind velocity, and barometric pressure.
Weather watching often seems to be as much an art as a science. Much of what makes up our weather is capable of being identified or anticipated only by those in the know, or in possession of sophisticated equipment. Even a professional meterologist cannot say with total accuracy what the weather will be tomorrow.
A knowledge of the atmosphere is necessary for an understanding of daily weather events. Once you have a awareness of the forces at work in the atmosphere and there interactions with one another. A altimeter or barometer can be used to assist you in attempting to forecast weather conditions.
In addition to science, mother nature can be used to predict changes in the weather.