Related Words

Equatorial Trough: The quasi-continuous area of low pressure between the subtropical high pressure areas in both the Northern and Southern Hemisphere.

North Equatorial Current: A current setting west-ward in the North Atlantic and North Pacific Oceans and in the Indian Ocean from about October to July. It occurs immediately north of the Equatorial Counter Current.

Pre-Frontal Trough: An elongated area of relatively low pressure preceding a cold front that is usually associated with a shift in wind direction.

South Equatorial Current: A current setting west-ward along and south of the Equator in the Atlantic and Pacific Oceans, and south of the Equator in the Indian Ocean. It occurs immediately south of the Equatorial Cou . . . View Full Definition

Trough: An elongated area of low atmospheric pressure that is associated with an area of minimum cyclonic circulation. The opposite of a ridge.

Equatorial Arcs: A method of progressing house cusps, based upon the Earth's rotation, in which one year of life corresponds to the passage of 1° right ascension over the meridian, approximately four minutes . . . View Full Definition

Long Wave Trough: A wave in the prevailing westerly flow aloft which is characterized by a large length and amplitude. A long wave moves slowly and is persistent. Its position and intensity govern weather pat . . . View Full Definition

Equatorial Countercurrent: A current setting eastward between the North and South Equatorial Currents of the Atlantic, Pacific, and Indian (in northern winter) Oceans. In the Atlantic and Pacific, its axis lies about . . . View Full Definition

Equatorial Undercurrent: A subsurface current setting eastward along the Equator in the Pacific, Atlantic, and Indian Oceans. In the Pacific, its core of maximum velocity lies at a depth of about 100 meters within t . . . View Full Definition

Equatorial Tidal Currents: Tidal currents occurring semimonthly as a result of the Moon being over the Equator. At these times the tendency of the Moon to produce a diurnal inequality in the tidal current is at a minimum.