A severe rain squall in the Mariana Islands during the north- east monsoon. They occur from November to April or May, especially from January through March.

Related Terms


1. A sudden brief increase in the speed of the wind of more transient character than a squall, and followed by a lull or slackening of the wind. 2. The violet wind or squall that accompanies a thunder- storm.


Any non-frontal line or band of convective activity in the atmosphere. This is the general term and includes the developing, mature, and dissipating stages. However, when the mature stage consists of a line of active thunderstorms, it is properly called SQUALL LINE; therefore, in practice, instability line often refers only to the less active phases. Instability lines are usually hundreds of miles long (not necessarily continuous), 10 to 50 miles wide, and are most often formed in the warm sectors of wave cyclones. Unlike true fronts, they are transitory in character, ordinarily developing to maximum intensity in less than 12 hours and then dissipating in about the same time. Maximum intensity is usually attained in late afternoon.


A sudden, violent wind often accompanied by rain.


A squall that occurs along a squall line


A squall frequent from May through August between Cabo de Sao Tome and Cabo Frio on the coast of Brazil


A squall which is relatively high in the center, tapering off on both sides


A heavy northwest squall in Manado Bay on the north coast of the island of Celebes, prevalent from December to February.


A name for a squall in the East Indies


A very violent wind and rain squall attended by thunder and vivid lightning often encountered during the rainy season along the west coast of Central America.


A squall with violent thunder, lightning, and rain, which blows at night in the Malacca Straits, especially during the south-west monsoon. It is intensified by strong mountain breezes.

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