The rate at which air temperature decreases, or lapses, as air rises into the atmosphere. If a cloud is not forming, air cools at 5.4 per 1,000 feet of vertical ascent. Though rare, late April snow does occur in Chicago. The quantity of heat absorbed or released without change of temperature when material undergoes a change of state. For example, heat is absorbed when ice at 32 degrees melts into water at 32 degrees, and that heat is latent heat.
Lenticular clouds are nearly stationary with respect to the ground.
An easterly wind in the Straits of Gibraltar, most frequent in March and from July to October. It causes complex and dangerous eddies downwind from the Rock of Gibraltar and, when moisture is sufficient, a spectacular banner cloud extends from the Rock's summit downwind a mile or more. The irregular path through the air along which a lightning discharge occurs. The series of electrical processes by which a charge is transferred through the atmosphere along a channel of high ion density between electrical charge centers of opposite signs. A grounded metallic conductor with its upper extremity extending above the structure that is to be protected from damage due to lightning.