The agency categorised flood risk levels as Very High, High, and Moderate, depending on local topography and rainfall intensity projections. Over 832 communities are at risk of varying degrees of flooding, with 100 major transportation routes facing possible disruptions.
NiHSA Director General, Umar Mohammed, urged residents in affected regions to remain vigilant, adhere to early warning directives, and cooperate with emergency response agencies.
"We call on state governments, local authorities, and the public to take proactive measures to mitigate risk and ensure community safety," Mohammed said.
The affected states include Adamawa, Akwa Ibom, Anambra, Bauchi, Bayelsa, Benue, Borno, Cross River, Delta, Ebonyi, Edo, FCT, Gombe, Imo, Jigawa, Kaduna, Kebbi, Kogi, Kwara, Lagos, Nasarawa, Niger, Ogun, Ondo, Plateau, Rivers, Sokoto, Taraba, Yobe, and Zamfara.
In a related development, the Lagos State government has sympathised with Ikorodu residents affected by the recent flood, assuring that necessary measures are in place to effectively manage flash floods.
The government is working on drainage infrastructure construction to address perennial flooding issues in Ikorodu. Special Adviser on Environment, Engr. Olakunle Rotimi-Akodu, explained that the intensity of the recent rainfall in Lagos was unusual and highlighted the need for resilient infrastructure to tackle the challenges posed by climate change.
"The government will ensure that the contractor handling the drainage project expedites work to address the immediate challenges in the areas affected," Rotimi-Akodu said.
The government has advised residents to display positive attitudes towards the environment, especially in waste disposal, and avoid encroachment on road infrastructure.
Commissioner for Special Duties and Inter-Governmental Relations, Mr. Gbenga Oyerinde, said the government is gathering information to enable it to take appropriate humanitarian decisions.
The Lagos State government has inspected the affected areas, including the ongoing construction of the Outfall Channel for the Gberigbe Road Project, the Palm Avenue Collector Drain, and other areas in Ijede and Igbogbo.