Heavy rainfall swept across the entire city, with the Meteorology General Directorate recording the highest rainfall in Beykoz-Ömerli at 193.84 kilograms per square metre. Rainfall measurements were reported for many other districts as well, painting a picture of a storm that swept across the entire city.
Using the data supplied by the Meteorology General Directorate, authorities set up a crisis desk to coordinate the response. The same day, a crisis management setup was triggered by the heavy rainfall, marking the start of an organized effort to manage the unfolding situation.
The Istanbul Disaster and Management Directorate (AFAD), together with the Istanbul Metropolitan Municipality (İBB) and local district municipalities, sprang into action. Authorities deployed 8,000 personnel and 2,000 vehicles to handle the emergency. These numbers were echoed in multiple reports, confirming that the same scale of forces was involved in both the general management and the specific rescue operations.
The same figures appeared in the ihbar records: 277 su baskını (waterlogging), 15 heyelan (landslides) and 47 mahsur kalma (trapped).
As the rain intensified, the city began to feel its effects. The Meteorology agency reported 47 flood incidents and 277 waterlogging cases across various districts. In parallel, officials counted 1,277 water incidents, 15 landslides and 47 people who became trapped. The same figures appeared in the ihbar records: 277 su baskını (waterlogging), 15 heyelan (landslides) and 47 mahsur kalma (trapped). Notably, havalimanları (airport) operations were not affected by the weather.
Rescue teams, comprising AFAD, İBB and district municipality staff, worked with the 8,000 personnel and 2,000 vehicles already mobilized. Their efforts were directed toward rescuing the 47 trapped individuals, clearing landslide sites and addressing waterlogged streets. The Istanbul Valiliği announced that AFAD and the 112 emergency line had received 2,518 ihbar (reports) related to the rainfall, a figure also expressed as "2 bin 518 ihbar sayısı".
Throughout the crisis, the Valiliği’s statement emphasized ongoing efforts to assist vulnerable groups and urged citizens to stay safe. Social services for children, the elderly and people with disabilities continued uninterrupted.