Overview
- The Navy's Directorate of Hydrography and Navigation issued Special Notice No. 33-26 after warnings published on Wednesday, saying anomalous swells will reach the Peruvian coast starting Thursday, August 27 and persist into Monday, August 31.
- DHN forecasts a sectoral pattern with light swells arriving the night of Thursday in the north and center, rising to moderate intensity around Friday, August 28 in several sectors, then easing from Saturday, August 29.
- Beaches that are open or semi‑open and face southwest are the most exposed because their orientation allows waves to deliver greater energy and higher runup onto shore.
- Technical definitions from DHN say 'light' swells can raise wave heights by up to 50% over normal while 'moderate' swells can double typical heights, a change that risks coastal flooding and damage to small vessels.
- Indeci, COEN and local port authorities are urging people to avoid exposure to waves, suspend port and fishing work, secure or haul small boats ashore, and follow real‑time updates from DHN through August 31.