Flash floods, river gauges, flood warnings, and inundation risk worldwide
This flood monitor tracks active flood events globally using river gauge data, precipitation forecasts, and coastal sea-level observations. Users searching for flood warnings near me, flash flood watch, or river flooding can quickly see current flood stage levels, warnings in effect, and predicted crest times.
Flooding takes several distinct forms. Flash floods develop within minutes to hours from intense rainfall, dam failures, or rapid snowmelt and produce the highest fatality rates. River floods rise more slowly as runoff accumulates in the basin, often peaking days after the rain stops. Coastal flooding occurs when storm surge, tides, and waves push seawater inland. Urban flooding happens when drainage systems can't handle rainfall intensity, leaving streets and basements submerged.
River flood levels are categorised relative to a defined flood stage: action stage triggers preparation, minor flood stage causes nuisance impacts, moderate flood stage threatens property, and major flood stage produces significant inundation. National weather services issue flood watches when conditions are favorable, flood warnings when flooding is imminent or occurring, and flash flood emergencies for life-threatening rapid-onset events.
Atmospheric rivers, mesoscale convective systems, and stationary thunderstorms produce the rainfall intensities that drive flash flooding. Saturated soils, urbanized watersheds with impervious surfaces, and steep terrain dramatically increase runoff and reduce the rainfall threshold needed to trigger flooding. Burn scars from recent wildfires can also unleash debris flows during otherwise modest rain events.
Localised flood risk depends on elevation, proximity to rivers or coastlines, drainage infrastructure, and recent rainfall. The location-aware section above identifies the nearest gauging stations and active warnings. Users in flood-prone regions should know their evacuation route and keep an emergency kit ready during the wet season.
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