The necessity of simultaneous analysis of the maximum heights for all three catastrophic floods of the Neva River of September 10(21), 1777, November 7 (19), 1842, and September 23, 1924, interconnected by inter elevation measurements was stated earlier 1,2.The flood of 1924 was preceded by abnormal hydrometeorological situation in the Atlantic and Europe caused by a strong cyclone originated on September 13 near the coast of Cuba. The water in the Neva mouth "began to recede" in the morning on September 23, but by 2 p.m. the height reached 180 cm above zero water level. The water rise "was barely discernable" in the interval 2 p.m.-3 p.m., which "allowed the supposition that the water would recede." However, "the water started to flow rapidly, and by 7 p.m it had reached its maximum of about 365 cm (12 feet)." Stormy weather from the sea (with a windflow of 41 m/s) favored this "additional" Neva water rise. The water "began to recede" after 7 p.m., and the Neva "filled the coasts" by the morning 3, p. 23.
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