The birth of Beatriz was complex. On June 4, a tropical wave formed on the west coast of Africa and was detected in the western Caribbean sea by June 14. A kelvin wave from the western Pacific as enhancing low-level vorticity and upward vertical motion east of 110 w at the time the tropical wave reached the eastern Pacific on June 15. The wave entered this environment, favorably, and it was later revealed that a low- to mid-level cyclonic circulation formed along the wave South of El Salvador by June 16. During this time, a faster moving wave entered Central America, resulting in interaction of both waves southeast of Acapulco, New Mexico, on June 17.
Over the next 24 hours, convection slowly increased along the western end of the trough. The coverage of the convection briefly decreased after 0000 UTC, and on June 19 a concentrated burst of convection developed over the center around 0600 UTC.
Press reports reveal that heavy rains, high waves, and strong winds damaged portions of the coast of the Mexico from the states of Guerrero to Jalisco. Heavy rains uprooted trees and flooded homes and roads. The maximum reported rainfall amounts by state include 222.5 mm at Copala in Guerrero, 167.5 in Lazaro Cardenas in Michoacán. and 159 mm in Callejones in Colima.
http://www.nhc.noaa.gov/data/tcr/EP022011_Beatriz.pdf
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