Learning how to chart weather conditions and interpreting them is important. In this exercise you are asked to look at several internet sites to interpret the weather. First, we need to define the different weather elements. The elements that make up the weather include the type of clouds in the sky, the temperature of the air, the amount of moisture or humidity in the air, and the speed and direction that the wind is blowing.

Symbols on weather charts help the meteorologist chart and predict the weather easily. If you make a chart of the pressure measured in millibars of mercury, you can get a sense of the direction of weather. Pressure is influenced by humidity and temperature.

Charting pressure helps to predict where the weather pattern is going. Atmospheric pressure moves weather systems. Cold air is more dense than warm air causing what is called high pressure. 

Weather map of pressure typical of winter