CAUSES OF PRECIPITATION

The amount of moisture, wind speed, topography, and temperature are important for the immediate weather. Pressure, wind direction, and movement of air masses are important to predict the weather. Water in the atmosphere moves around and causes all kinds of weather. The physical properties of water allow this compound to move easily from one state of matter to another. Rain is the liquid form. Snow, sleet, and hail are the solid form. Water vapor is the gaseous form.

When a liquid is converted to gas, it is termed evaporation. Condensation is when vapor turns back to a liquid. Melting occurs when a solid is changed to a liquid, and freezing is the revere process. When a solid goes directly to a gas and vice versa, this is called sublimation. Frost is an example of sublimation in nature.