66-day Ohio River Valley flooding (May 19–Jul 24, 2026) threatened 310K+ residents. Driven by sustained rainfall + snowmelt. Contamination & evacuation critical.
🌊 OPEN LIVE 3D WEATHER ALERTSA sustained flooding event impacted the Ohio River Valley region near Cincinnati, Ohio (39.101°N, 84.513°W) from May 19 through July 24, 2026. The 66-day event produced persistent riverine and urban flooding across multiple counties, affecting critical infrastructure and displacing thousands of residents across Ohio, Indiana, and Kentucky.
The Green Flood—named for its sediment-laden, murky appearance—posed immediate risks to water supplies, sanitation systems, and transportation networks. Communities downstream faced compound hazards: prolonged inundation, contamination of groundwater, and structural damage from sustained hydraulic pressure on foundations and levees.
The Ohio River basin, which drains 204,000 square kilometers across 15 states, is vulnerable to prolonged flooding when atmospheric rivers or multiple precipitation events saturate soil and overwhelm channel capacity. The Cincinnati region sits in a bedrock-dominated watershed where soil infiltration is limited by clay-rich glacial deposits and urban impervious surfaces. This May-July event likely resulted from a combination of above-normal spring snowmelt (elevated baseflow) and repeated heavy convective rainfall, sustaining discharge well above bankfull levels for extended periods.
Real-time USGS stream gauge networks and NOAA precipitation radar quantified discharge, stage height, and rainfall accumulation across 47 monitoring stations in the Ohio River Valley. Satellite flood extent mapping (NASA MODIS/Sentinel-1) tracked inundated area dynamics; our 3D flood simulation module integrates these live feeds to model water movement and predict affected zones 3–7 days ahead.
The Ohio River historically floods every 4–6 years; the 2026 Green Flood ranks in the 20-year recurrence category. Cincinnati's urban population (~310,000) and industrial riverfront (petrochemicals, power plants) face compounded exposure to water contamination and chemical spills during prolonged inundation events.
Monitor real-time stream stage and precipitation data via Pandita Data's 3D flood simulation module to track water movement in your area and plan evacuation routes ahead of time.