National Weather Forecast: Extensive Precipitation System
The National Meteorological Service (SMN) has issued a forecast of severe weather conditions that will affect a large portion of the Mexican territory. A significant meteorological phenomenon, identified as tropical wave number 35, is interacting with humidity systems and wind patterns, generating a favorable scenario for extraordinary precipitation events and winds of considerable intensity. This technical analysis details the scope, associated risks and official recommendations in the face of this meteorological situation.
The interaction of this low pressure system with the humidity of the Pacific Ocean and the Gulf of Mexico is creating ideal conditions for the development of deep convective activity, which translates into the heavy to intense rains predicted. The energy released by the condensation of water vapor in the atmosphere is the main driver of these phenomena, which are characterized by their ability to discharge large volumes of water in relatively short periods.
Breakdown of Precipitation by Intensity and Federal Entity
The agency dependent on the National Water Commission (Conagua) has categorized the rainfall expected for the next few hours based on its intensity and potential accumulation, measured in millimeters (mm). This classification is crucial for risk assessment and activation of emergency protocols.
Intense occasional rains are forecast, with accumulations that will range between 75 and 150 mm, in the states of Guerrero, Oaxaca, Veracruz, Tabasco and Chiapas. This level of precipitation, considered the highest on the scale, represents a severe hydrometeorological hazard with the capacity to saturate soils and drainage systems in a matter of minutes.
In the category of very heavy rains (50 to 75 mm) are the entities of Sinaloa, Campeche, Yucatán and Quintana Roo. While heavy precipitation (25 to 50 mm) is expected in Durango, Nayarit, Jalisco, Colima, Michoacán, Morelos, Puebla and Tamaulipas.
For an additional group of states, the SMN predicts showers (5 to 25 mm) in Chihuahua, Zacatecas, San Luis Potosí, Hidalgo, Tlaxcala, State of Mexico and Mexico City. Finally, isolated rains of lower intensity (0.1 to 5 mm) are anticipated in Nuevo León, Aguascalientes, Guanajuato and Querétaro.
Hydrometeorological Risks and Associated Phenomena
The SMN has emphatically warned about the dangers derived from this episode of extraordinary rains. The predicted accumulations have the potential to generate slope instability (slides), sudden increases in the levels of rivers and streams, as well as flooding in topographically low and urban areas with deficiencies in drainage infrastructure. Soil saturation reduces its absorption capacity, exponentially increasing surface runoff and, consequently, the risk of overflows.
In parallel with the rainfall, a system of winds of notable intensity is expected. Sustained winds of 20 to 30 km/h are expected with higher gusts that can reach 40 to 60 km/h on the coasts of Veracruz and Oaxaca. Other entities such as Baja California, Baja California Sur, Chihuahua, Coahuila, Nuevo León, Tamaulipas, San Luis Potosí, Zacatecas, Durango, Aguascalientes, Guanajuato, Querétaro and Tabasco will experience winds of 10 to 20 km/h with gusts of 30 to 50 km/h.
These wind patterns, combined with soft soils due to humidity, increase the probability of damage due to falling trees and the destruction or detachment of advertising signs and light structures, constituting an additional risk to the safety of people and the integrity of material assets.
In the maritime area, the forecast includes the forecast of high waves of 1.5 to 2.5 meters of significant height on the coasts of Veracruz, Tabasco, Oaxaca and Guerrero. This condition represents a danger for navigation and port activities, as well as for safety in beach areas.
Analysis of the Context and Official Recommendations
Tropical wave 35 is a recurring phenomenon during the rainy and tropical cyclone season in Mexico, which officially extends from May to November. These waves are troughs or corridors of low pressure that move from east to west through the tropics, often serving as seeds for the development of tropical cyclones. Although not all waves intensify, their interaction with favorable atmospheric and oceanic conditions, such as the current ones, can significantly enhance the activity of rain and thunderstorms.
Faced with this scenario, the National Meteorological Service and the Civil Protection authorities have made a strong exhortation to citizens. It is recommended to constantly pay attention to official weather warnings and bulletins, which are constantly updated. It is essential to follow the instructions of local and state Civil Protection authorities, which may include evacuation protocols in high-risk areas, temporary shelters and mobility restrictions.
The population is urged to avoid crossing swollen fords, rivers or streams, since the strength of the current can be deceptive and drag vehicles and people. In urban areas, it is recommended to check and clean drains and sewers to prevent localized flooding. For residents on slopes or ravines, it is crucial to be alert for any signs of ground movement, such as cracks or small landslides, that may precede a larger event.
Coordination between different levels of government and citizens is the cornerstone for comprehensive disaster risk management. Prevention and preparation are the most effective tools to mitigate the impact of these natural phenomena, which, although they are recurrent, their intensity and effects can vary significantly.
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