A progressive increase in atmospheric instability was observed starting August 13, 2026, due to the interaction between the Intertropical Convergence Zone, high humidity, and successive tropical waves. This led to a deterioration in weather conditions. The National Commission for Risk Prevention and Emergency Response initially declared a green alert for affected areas on August 13.

The alert level was later elevated due to increased precipitation and the arrival of tropical wave number 32. Further details are available from the source regarding the effects of the tropical waves and the resulting weather conditions.