El Niño significantly increases the risk of catastrophic riverine floods, flash floods, and mudslides across key vulnerable geographies by altering storm tracks and saturating major river basins.
Global Flood Hotspots During El Niño
- East Africa (Tana, Nyando, Shabelle Basins): Intense October–December downpours frequently overtop dykes in Kenya (Garissa, Budalangi, Ruiru) and submerge river towns in Somalia (Beledweyne, Jowhar).
- South American Pacific Coast (Piura, Guayas Basins): Sudden torrential rains on the western Andean slopes trigger destructive debris flows (huaycos) that destroy roads and bridges in Peru and coastal Ecuador.
- South American Littoral (Paraná & Uruguay Basins): Sustained multi-week rainfall inundates agricultural floodplains in southern Brazil and northeastern Argentina.
How El Niño Tracker Evaluates Flood Risk
Unlike raw rainfall forecasts, true flood potential depends on antecedent hydrological conditions. Our platform evaluates three core physical signals:
- 48-Hour Forecast Rainfall: Anticipated atmospheric volume (Open-Meteo NWP models).
- Current Soil Moisture: Near-surface saturation (0–10 cm depth); saturated ground forces rain into immediate surface runoff.
- River Discharge Ratio: Real-time river flow compared to its 90-day baseline (GloFAS hydrological model via Copernicus).
| Risk Tier | Score Range | Physical Meaning & Trigger Conditions |
|---|---|---|
| Very High | 75–100% | Multiple strong signals at once: heavy forecast rain on saturated ground and/or rivers far above their recent flow. Check official warnings now and be ready to act. |
| High | 50–74% | Significant rain expected and/or wet soils or rising rivers. Localised flooding is plausible, especially in low-lying areas and along rivers. |
| Moderate | 25–49% | Some rain and moderately wet conditions. Flooding is unlikely to be widespread but drains, streams and flood-prone spots deserve attention. |
| Low | 0–24% | Little forecast rain, drier soils and normal river flow. Flash floods from intense local storms are still possible. |
Top Cities by Current Monitored Flood Risk
Review real-time composite risk scores across globally monitored population centres:
| City & Country | Coordinates | Flood Risk Tier | Primary Basin | Action |
|---|---|---|---|---|
| Nairobi, Kenya | 1.29° S, 36.82° E | MONITORED | Nairobi County | View Live → |
| Mombasa, Kenya | 4.04° S, 39.67° E | MONITORED | Coast Province | View Live → |
| Kisumu, Kenya | 0.09° S, 34.77° E | MONITORED | Kisumu County | View Live → |
| Garissa, Kenya | 0.45° S, 39.65° E | MONITORED | Garissa County | View Live → |
| Nakuru, Kenya | 0.30° S, 36.08° E | MONITORED | Rift Valley | View Live → |
| Eldoret, Kenya | 0.51° N, 35.27° E | MONITORED | Uasin Gishu | View Live → |
| Ruiru, Kenya | 1.14° S, 36.96° E | MONITORED | Kiambu County | View Live → |
| Malindi, Kenya | 3.22° S, 40.12° E | MONITORED | Kilifi County | View Live → |
| Kampala, Uganda | 0.35° N, 32.58° E | MONITORED | Central Region | View Live → |
| Entebbe, Uganda | 0.05° N, 32.46° E | MONITORED | Central Region | View Live → |
| Jinja, Uganda | 0.42° N, 33.20° E | MONITORED | Eastern Region | View Live → |
| Mbale, Uganda | 1.08° N, 34.18° E | MONITORED | Eastern Region | View Live → |
| Gulu, Uganda | 2.77° N, 32.30° E | MONITORED | Northern Region | View Live → |
| Mbarara, Uganda | 0.61° S, 30.65° E | MONITORED | Western Region | View Live → |
| Kasese, Uganda | 0.18° N, 30.08° E | MONITORED | Western Region | View Live → |
Flood Preparedness and Safety Disclaimer
Flood risk assessments provided by El Niño Tracker are for situational awareness and screening only. They do not replace official weather warnings, flood alerts, or mandatory evacuation directives issued by national meteorological and civil defense agencies.
During flash flood warnings: never walk or drive through moving floodwaters, stay away from riverbanks, move to higher ground immediately, and monitor local authorities.
Read our full Methodology and Data Sources documentation.