The expression “black storm” has begun to spread in Mexico in the middle of the rainy season given the forecast of intense episodes in Mexico City. Although it is not an official term of the Mexican meteorological system, it describes a real phenomenon: storms with sufficient intensity to darken the sky in a matter of minutes and cause extreme precipitation.
What is a black storm and why it worries
The concept comes from Asian alert systems, where it is used to identify very high intensity rainfall, exceeding 70 millimeters per hour. In practice, it corresponds to what is considered torrential rain in Mexico.
The key to the phenomenon is not just the amount of water, but the visual and atmospheric effect: large, very dense cumulonimbus clouds block the sunlight and generate a sudden darkness in broad daylight, accompanied by electrical storms, strong wind and, in some cases, hail.
Why it can affect Mexico City
The conditions that favor this type of storms are already present in a good part of the country. The combination of moisture from the Pacific and the Gulf of Mexico, along with low-pressure systems, creates a favorable scenario for intense rains in the center of the country.
In Mexico City, this type of episode can translate into rapid and very concentrated precipitations, with high accumulations in a few hours.
Areas with greater risk and possible impacts
The most exposed urban areas are those with historical drainage problems or high density, where intense rains can generate:
- Severe floods and waterlogging
- Mobility collapse
- Falling trees or structures
- Drastic reduction in visibility
In the metropolitan area, southern and western mayoralties tend to concentrate the greatest effects in this type of episodes.
What differentiates this phenomenon from a normal storm
Not all intense rains are considered “black storm”. The difference lies in the combination of three simultaneous factors:
- Extreme precipitation intensity
- Abrupt darkening of the sky
- High electrical activity and wind
When these elements coincide, the impact on the city can be immediate, especially in dense urban areas like CDMX.
What the authorities recommend
In the face of episodes of intense rain, recommendations focus on prevention: avoid unnecessary travel during strong storms, do not cross flooded areas, exercise extreme caution when driving, and stay informed through official channels.
A viral term with real base
Although “black storm” is not part of the official terminology in Mexico, its use has spread due to its ability to graphically describe extreme meteorological episodes.
Beyond the name, the phenomenon reflects an increasingly frequent pattern: more intense, concentrated rains with greater impact in urban environments. In cities like CDMX, this turns each storm episode into a critical factor for mobility and security.