The arrival of winter on the Peruvian coast is felt more strongly this year due to the intensification of the South Pacific AnticycloneThe strengthening of this high atmospheric pressure mass is changing both temperatures and humidity levels, particularly affecting large cities and coastal regions. Since mid-June, various meteorological agencies have issued alerts due to the unusual conditions experienced in the area, recommending that the population take extreme precautions against the cold, wet weather.
El National Meteorological and Hydrological Service of Peru (Senamhi) and Directorate of Hydrography and Navigation (DHN) They have highlighted how this phenomenon directly affects daily life along the coastal strip. Record levels of humidity, morning drizzle, and low wind chill have marked the start of the season, forcing thousands of residents to adapt their routines and take protective measures against the cold.
What is the South Pacific Anticyclone and why is it relevant?
The South Pacific Anticyclone It is an extensive high Located over the Pacific Ocean, off the coasts of Chile and Peru. This system is characterized by its stable, cold, and dry air mass that rotates clockwise. Its position and intensity greatly influence the weather conditions of the Peruvian coast, acting as a kind of natural barrier which limits heavy rains and favors the presence of Low cloud cover, drizzle and falling temperaturesIf you want to understand how these systems also affect other regions, you can consult about what is a desert and its relationship with atmospheric phenomena.
In recent days, this anticyclone has strengthened and moved slightly towards the continent, which has caused a increase in cold winds coming from the south and a greater incidence of humidity in coastal cities. All of this has contributed to a harsher winter, with minimum temperatures reaching 10°C in some districts of Lima and a feeling of cold that affects even during the day.
Most affected regions and general forecast
The regions under alert awarded by the action of the anticyclone include Lima, Callao, Ica and Arequipa. Senamhi has indicated that these areas will experience winds up to 35 km/h In some places, mostly cloudy skies and persistence of light drizzle and fog, especially at night and early in the morning. Relative humidity in the air has reached values of 100% in several districts of Lima, generating a saturated atmosphere that favors the development of fog and the formation of wet runways.
In Metropolitan Lima, citizens have already noticed the sharp drop in temperatures and the constant presence of cloudiness and humidityAn example of this is what happened in districts such as Villa María del Triunfo and Jesús María, where drizzle has continued for several hours a day. Authorities also warn that in Arequipa and Ica, winds could reach higher than average intensities, increasing the feeling of cold and reducing visibility on roads and open areas.
The weather conditions predicted by Senamhi, supported by oceanographic reports from DHN, indicate that These anomalies will continue at least until June 22., with a likely return of sunny periods between the 23rd and 25th, although nights will remain cold. Furthermore, meteorological and oceanographic charts compiled in recent days show normal or slightly positive sea surface temperature values, but accompanied by higher humidity and pressure levels than in previous years.
Consequences for the population and recommendations
El South Pacific Anticyclone not only modifies the climate, but also affects health and population mobility. High humidity and temperature drops can aggravate respiratory discomfort and represent a greater risk to children, the elderly, and people with chronic illnesses. For this reason, Senamhi has insisted on the importance of wear warm clothing, avoid prolonged exposure to the cold and monitor official reports of sudden weather changes.
Furthermore, the reduced visibility and the slippery roads have caused traffic delays and the need to take precautions when driving, especially in districts near the sea such as Chorrillos, Barranco, and Callao. It is recommended to stay tuned to Senamhi's institutional channels and social media, where alerts are updated and advice is provided on how to respond to the temporary intensification of cold and humidity.
Oceanographic data and sea situation
Recent bulletins of the Directorate of Hydrography and Navigation show that the conditions of the peruvian sea present in general terms surface temperatures between 14 °C and 24 °C, with both negative and positive anomalies along the coast. Off the central coast, especially in areas near Callao and Chimbote, sea temperatures were slightly above average, contrasting with the colder atmosphere due to the strengthening winds and the effect of the anticyclone.
El mean sea level has also shown certain positive anomalies off the coast of Talara and the northern zone, while in areas such as Matarani or Ilo the trend is more stable. For the next few days, climate models predict that The high pressure system remains somewhat displaced southeast of its usual position, with secondary nuclei favoring periods of moderate to strong winds and waves of variable height between 1,2 m and 2 m on the central and southern coast.
El Senamhi and DHN forecast indicates that the anticyclone will continue to have influence throughout the week, so the recommendations for caution and monitoring of official updates remain in effect.
The beginning of winter in the coastal region of Peru has arrived accompanied by Low temperatures, high humidity and persistent winds Due to the strengthening of the South Pacific Anticyclone. This phenomenon, common in South America but especially intense this year, requires the population to stay informed and take precautions to protect their health, safety, and mobility in their daily activities.