Significant 48-72 hour flood event across Greater Montreal and southwestern Quebec threatens displacement and infrastructure damage. Heavy precipitation and snowmelt drive river system overflow.
🌊 OPEN LIVE 3D WEATHER ALERTSA significant flood event is unfolding across the Greater Montreal region (45.495°N, 73.847°W) from June 20–22, 2026. The Green Flood—named after meteorological and hydrological triggers—poses acute displacement and infrastructure damage risks to southwestern Quebec communities. Water levels are rising across riverine systems draining into the St. Lawrence basin, with emergency services activating evacuation protocols and flood barriers across vulnerable neighbourhoods near the Lachine Rapids corridor and tributary zones.
This flood event stems from a convergence of atmospheric moisture and snowmelt-driven streamflow. Heavy precipitation over 48 hours saturates soils already primed by early-season snowpack discharge in the Laurentian and Appalachian headwaters feeding Quebec's river network. The Montreal region's geography—positioned at the confluence of multiple tributaries and dominated by clay-rich glacial deposits—creates rapid runoff concentration and limits soil infiltration, accelerating water accumulation in low-lying urban and rural zones.
Real-time hydrological simulations integrate NOAA precipitation radar, Environment Canada streamflow gauges, and USGS water-level sensors to map rising flood extents. Satellite imagery from NOAA and NASA corroborates inundation footprints, while our 3D flood model visualizes water surface elevation and flow vectors across the St. Lawrence–Ottawa basin network, enabling emergency managers to predict barrier breach points and evacuation timing.
Canada experiences 30+ significant flood events annually, with spring and early-summer inundation dominating. The Montreal region has a 100-year flood baseline; current conditions exceed this threshold. Freeze–thaw cycles in northern watersheds amplify spring runoff; urban drainage systems struggle with compound precipitation events.
Monitor Pandita Data's live flood simulation and Environment Canada's flood bulletins every 2 hours. Your location's real-time water-level forecast appears in our 3D hydrology module.