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sumatra"A squall, with wind speeds occasionally exceeding 13 m s−1 (30 mph), in the Malacca Strait between Malay and Sumatra during the southwest monsoon (April through November).
Sumatra A squall with violent thunder, lightning, and rain, which blows at night in the Malacca Straits, especially during the southwest monsoon. It is intensified by strong mountain breezes.
Haze is a regular problem in Southeast Asia caused by land and forest fires in Indonesia, especially Sumatra and Kalimantan. Those fires mainly affect Brunei, Indonesia, Philippines, Malaysia, Singapore and Thailand.
It forms an island between Java and Sumatra. Its eruption in 1883, which was one of the most violent in modern times, scattered debris and darkened skies over vast areas. Additional eruptions occurred in late 1927 and in the l960s.
In nautical use, a severe local storm considered as a whole, that is, winds and cloud mass and (if any) precipitation, thunder and lightning. See squall line, arched squall, black squall, sumatra, Abrolhos squalls.
 See also: Water, Temperature, Surface, High, Night
  
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