Real-time coverage of floods event — Green Flood in United States from: 13 Apr 2026 01 to: 22 Apr 2026 01. — Pandita Data.
🌊 OPEN LIVE 3D WEATHER ALERTSA significant flood event designated "Green Flood" is affecting the south-central United States, with peak impact occurring between April 13–22, 2026. The event is centered near San Antonio, Texas (coordinates 29.425°N, 98.495°W), where prolonged heavy rainfall has triggered widespread inundation across low-lying areas, urban drainage systems, and river corridors. Emergency management agencies are monitoring displacement risk, infrastructure damage, and water quality hazards across affected communities.
Spring flooding in south-central Texas is driven by atmospheric moisture convergence and frontal systems that stall over the region during April. Warm, moist air from the Gulf of Mexico collides with cool continental air masses, generating repeated thunderstorm complexes that deposit heavy rainfall over 8–10 days. The San Antonio area, built on limestone karst terrain with naturally high water tables and rapid runoff, is particularly vulnerable: impervious urban surfaces (concrete, asphalt) prevent water infiltration, forcing stormwater into already-saturated drainage basins and tributaries of the Guadalupe, San Antonio, and Medina Rivers.
Antecedent soil moisture—rainfall accumulated in preceding weeks—increases flood severity. When soils are already saturated, additional rainfall cannot percolate and instead runs off immediately, concentrating streamflow. The combination of orographic lift (air forced upward over terrain features) and mesoscale convective organization can produce training effects, where successive thunderstorms move along the same path, dumping rain repeatedly over identical watersheds. This mechanism is one of the most dangerous flood-producing scenarios in North America.
Pandita Data integrates real-time NOAA precipitation radar, USGS stream gauge networks, and GOES-16 satellite thermal imagery to monitor flood development. Precipitation estimates from NOAA Multi-Radar Multi-Sensor (MRMS) products show rainfall accumulation rates and storm movement. USGS stream flow sensors in the Guadalupe, San Antonio, and Medina Rivers transmit stage (water level) and discharge data every 15 minutes—critical for detecting when rivers exceed flood stage. Satellite-based soil moisture estimates from SMAP (Soil Moisture Active Passive) reveal antecedent saturation, helping forecasters assess runoff potential. Our 3D flood simulation overlays these live feeds onto digital elevation models, showing flood extent, flow direction, and inundation timing across the region.
Flash Flooding: Creeks and urban stormwater systems can exceed capacity in minutes during heavy rainfall, trapping vehicles and people in low-lying areas. River Flooding: Multi-day rainfall causes main-stem rivers to crest days after rainfall begins; rural communities along the Guadalupe and San Antonio Rivers face inundation of homes and agricultural land. Water Quality Threats: Floodwaters mix with sewage, industrial runoff, and agricultural chemicals; contaminated water increases disease risk and extends recovery time. Landslide Risk: Saturated limestone slopes can fail, creating secondary hazards.