Extremely dangerous onshore flow from the Mediterranean is poised to bring potentially catastrophic flooding to the Valencia area today, September 30th, 2025. If thunderstorms develop and anchor in the region, they could produce nearly stationary rainfall for several hours, leading to extraordinary accumulations. High-resolution weather models are simulating rainfall amounts of 500-750 mm within a 24-hour period, according to a social media post by [@Stormyalert](https://twitter.com/Stormyalert) early this morning. This level of precipitation could result in localized extreme flooding, with the potential to be hazardous for Valencia and nearby coastal towns, even further north. The warning comes as a reminder of the extreme weather potential, with [@Stormyalert](https://twitter.com/Stormyalert) stating that while not a confirmed repeat of October 2024 events, the conditions warrant serious attention and preparedness. Residents are urged to have a plan and be prepared for the severe threat. This alert is specific to the current weather situation and does not directly reference the interaction between Tropical Storms Imbelden and Humberto, which was noted in earlier reports from September 30th, 2025, between 12:35 AM and 3:35 AM UTC.
