If you're a resident of Mexico City, you've likely encountered the city's Rainfall Alert System during this particularly heavy rainy season. This system, established by Civil Protection, uses a color-coded warning system to inform residents about the expected intensity of rainfall and the appropriate precautions to take. The colors range from yellow, indicating low intensity rain, to purple, signaling extreme rainfall.

Let's break down the meaning of each color and the recommended safety measures to ensure you're prepared for any level of rainfall.

Yellow Alert: This alert is triggered when rainfall between 15 to 29 millimeters is forecasted. Residents are advised to:

Carry an umbrella or raincoat.
Avoid disposing of grease or trash into the drainage system.
Utilize the rainwater for plant irrigation.
Stay updated on potential flash floods and other disruptions from official sources.

Orange Alert: This alert is issued when rainfall of 30 to 49 millimeters is anticipated. Residents are advised to:

Close all doors and windows.
Refrain from crossing streets or avenues that have strong water currents or are flooded.
If cycling, wear a reflective raincoat for visibility.

Red Alert: This alert comes into effect when rainfall of 50 to 70 millimeters is expected. Residents are advised to:

Keep essential documents in a waterproof bag.
Use fog lights when driving.
Avoid areas prone to flooding.

Purple Alert: This alert indicates expected rainfall exceeding 70 liters per square meter. Residents are advised to:

Prioritize evacuation of children, the elderly, and people with disabilities in the event of flood or landslide warnings.
Report any instances of flooding to emergency services (911).

The green alert signifies rainfall of less than 15 millimeters, requiring minimal precautions.