Given the same temperature and pressure, humid air rises compared to dry air. As the humidity increases, so does the tendency of air to rise. More » Science Weather & Tides

Humid, subtropical climates occur where four factors intersect: latitude between 20 and 40 degrees north or south, onshore movement of humid air masses in summer and cyclonic storms in winter. Humid, subtropical climates... More » Science

Air density is the mass of air per unit of volume it occupies, and it is expressed in kilograms per cubic meter when using the metric system. In the free atmosphere, air density decreases when temperature increases or wh... More » Science Measurements
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Differences in temperature causing differences in air density lead to differences in air pressure. As the temperatures of portions of the atmosphere increase, the air in these portions expands and rises, causing low-pres... More » Science Weather & Tides

Local winds are one of the main types of winds caused by differences in air temperature. The temperature differences often develop through the day as the sun heats the air and land, but they can also be formed when surfa... More » Science Weather & Tides

Cold fronts move faster than warm fronts because their cooler temperature increases the density of the air and concentration of molecules. Warm fronts are sometimes nearly motionless when cold fronts take them over. This... More » Science Weather & Tides

Read a wind-chill factor chart by plotting the ambient air temperature against the wind speed, resulting in the apparent temperature felt on exposed human skin. Generally, higher wind speeds at colder temperatures result... More » Science Weather & Tides