Precipitation across Canada in motion, from the Environment Canada radar network. Play the loop to see where rain and snow have been, switch to the extrapolation for where they are headed, or flip to satellite for the cloud picture. Click any marker for that city's forecast.
What you are seeing is the Canadian weather radar composite from Environment and Climate Change Canada (MSC GeoMet): 1 km resolution, a new frame every 6 minutes, with the last three hours available for replay. Colour intensity tracks how hard the rain or snow is coming down.
Rain is shown in millimetres per hour and snow in centimetres per hour on separate layers — open the legend under the map for the exact scale. Near the border the composite also includes US radars.
The Next hours layer is Environment Canada's extrapolation of the current echoes — useful for the coming hour or two, not a forecast. Flip to satellite for the wide shot: daily NASA imagery that shows entire fronts long before they reach radar range.