Tide Graph

The following is a graph of the daily high tides predicted to occur at the Neponset River outflow in Boston/Quincy, Massachusetts. The graph is relatively close to the predicted tides elsewhere in eastern Massachusetts, including the Norfolk County Mosquito Control towns of Braintree, Milton, and Weymouth.The graph is important for mosquito control personnel because the salt marsh mosquito’s life cycle is in synch with the monthly tidal cycle, as well as rainfall. Since the tides are predictable, the emergence of this mosquito is also predictable.Unusually large rain events can also trigger salt marsh mosquito emergences. These occurrences are, of course, unpredictable.

Summer 2021

For residents who live near salt marshes that breed this mosquito, one can use this graph to predict when larger than usual outbreaks will most likely occur. The dates on the chart represent the date of the spring high tide. Simply add 7-10 days to this date and the mosquito outbreak is predicted. This summer, the likely dates of the more severe mosquito outbreaks in Massachusetts coastal towns start around May 27th, June 24th, July 23rd, August 21st, and September 11th.


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