Divergence at ground level requires that air immediately above the diverging layer must descend. The equatorial belt into which northeast trade winds from the northern hemisphere and southeast trades from the southern hemisphere converge. The weather there is warm, humid, showery, with light winds. The incident resulted in this country s first meaningful air pollution laws, culminating in the federal Clean Air Act of 1970. The Austrian physicist who, in 1842, noted in the case of sound waves, the change of frequency with which the sound reaches a receiver when the receiver and source are in motion relative to each other.
Drafts often consist of cold air moving across a floor and, as such, are unpleasant.
Unlike fog, drizzle falls to the ground. Drops larger than 0.01 inch are known as rain, and it is erroneous to refer to very light rain as drizzle. An instrument used to measure the amount of dew formed on a given surface. Extreme dryness due to lack of precipitation over periods that are relatively extensive in area and time. The term is applied regardless of the season, though the effects of drought are most noticeable during the growing season.