An Analytical Synoptic-Dynamic Study About the Severe Weather Event Over the City of Rio De Janeiro on January 2, 1987

by Fábio de Alcantara, Univ Federal do Rio de Janeiro, Brazil,
Dulce Cardoso Washington, Univ Federal do Rio de Janeiro, Brazil,



Document Type: Proceeding Paper

Part of: Coastlines of Brazil

Abstract: The paper reviews the synoptic parameters that lead to the severe weather occurred on January 2, 1987 over the city of Rio de Janeiro. The pattern of this weather was reported on the newspapers as strong wind lasting one and a half hour and 20 minutes of heavy showers. Severe damages on ships in the Guanabara Bay were reported, including crash of an offshore platform against the Rio-Niteroi Bridge. From the observational analytic study strong evidence of the participation of a synoptic entity of the class of microcyclones, has been obtained imbedded in the trough generated by the dominant macrocyclone conditions. The scalar amplitude of the misocyclone was in accordance with the pattern of such microsystems. Its extension was about 40 km, and its area of critical activity inferior to 10 km, or 3,000 m in the Guanabara Bay where its severity was the highest. Additional aspects of the subject are discussed.

Subject Headings: Urban areas | Bays | Wind engineering | Ship collisions | Parameters (statistics) | Damage (structural) | Ships | Brazil | South America

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