Tropical Storm Ivo, which formed in the eastern Pacific Ocean on August 6, 2025, is currently bringing intense rainfall to Sinaloa, Mexico. As of August 8, the storm has maximum sustained winds of 60 mph with gusts up to 70 mph, and is moving west-northwest at 14 knots (approximately 16 mph). The storm's interaction with the North American Monsoon is amplifying the potential for heavy precipitation across several municipalities in Sinaloa. Forecasters anticipate rainfall totals ranging from 75 to 150 mm in areas like Badiraguato and Rosario, raising concerns about landslides and flooding.
The North American Monsoon, active from late June through September, is a significant source of rainfall for northwestern Mexico, with tropical storms like Ivo contributing substantially during late summer. In response to the evolving conditions, local authorities have initiated emergency protocols. In Rosario, 100 homes have been affected, and a temporary shelter has been established. Mazatlán has experienced flooding impacting 150 residences, and a sinkhole on the Mazatlán-Culiacán highway caused considerable traffic disruptions. Historical data from a similar storm in 2019, also named Tropical Storm Ivo, shows that Mazatlán recorded 89.4 mm of rain overnight, leading to the evacuation of approximately 50 people. Current forecasts suggest Ivo may strengthen into a hurricane by August 8, though landfall is considered unlikely. Residents in affected areas are urged to remain vigilant, stay informed through official channels, and follow guidance from state authorities and Civil Protection. While Ivo is expected to strengthen, there is some uncertainty in its projected intensity due to variations in model guidance. Beyond the initial 24 hours, weakening is anticipated as the storm moves over cooler waters and into a more stable environment.