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 »

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 »

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 »

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 »

A heat wave, defined by the National Weather Service as three or more consecutive days where the temperature reaches at least 90 F, typically occurs when a ridge of high pressure air inflates over a large area. The likel... More »

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 »

A weather thermometer measure the surrounding outside or inside air temperature. The thermometer, which is a device composed of a long tube with a fluid in it, is enclosed in a glass rod. The fluid inside the tube can be... More »

www.reference.com Science Weather & Tides