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Algae blooms in places like Montauk's Fort Pond are frequently set off after heavy rains wash large amounts of nutrients into water. If they come following long dry periods, the effects can be ampliefied even further.
Heavy downpours send huge amounts of water tainted with chemicals and nutrients from road, lawns and farm fields into ponds like Mill Pond in Water Mill, often sparking algae blooms. Dana Shaw
Lake Agawam in Southampton Village has suffered from chronic algae blooms, which are exacerbated by the heavy downpours that have defined the rainfall pattens in the Northeast in recent decades.
Rain storms that dump more than 2 inches of water in a 36 hour period have been on the increase nationwide in recent decades, but the Northeast has seen the largest spike by far. National Climate Assessment
Michael Wright on Sep 2, 2020