Heavy Snowfall
Heavy snowfall is a period of snow that produces significant accumulation over a relatively short period of time.
SnowStorms
Snow
Snow is frozen precipitation that forms as ice crystals in clouds and falls to the ground as snowflakes.
Mist
What Is Mist? Mist is a collection of tiny water droplets suspended in the air near the Earth’s surface that reduces horizontal visibility, but generally not as severely as fog. It develops when moist air becomes close to or reaches saturation, allowing water vapour to condense into microscopic droplets. Mist is common across Canada and … Read more
Freezing Fog
What Is Freezing Fog? Freezing fog is fog made up of tiny supercooled water droplets that remain liquid even though the air temperature is below freezing. When these droplets come into contact with sufficiently cold surfaces, they can freeze and form a coating of ice. This makes freezing fog different from ordinary fog because it … Read more
Ice Fog
What Is Ice Fog? Ice fog is a type of fog made primarily of tiny ice crystals suspended in the air near the Earth’s surface. It develops under extremely cold conditions and can significantly reduce horizontal visibility. Unlike ordinary fog, which is primarily composed of liquid water droplets, ice fog forms when atmospheric moisture freezes … Read more
Dense Fog
What Is Dense Fog? Dense fog is a particularly thick concentration of tiny water droplets suspended near the Earth’s surface that causes a substantial reduction in horizontal visibility. It develops through the same basic processes as ordinary fog, but the concentration and distribution of droplets make it much more difficult to see through. Dense fog … Read more
Fog
What Is Fog? Fog is a collection of tiny water droplets, or in some very cold conditions ice crystals, suspended in the air near the Earth’s surface. When these particles become concentrated enough, they scatter light and reduce horizontal visibility. Fog is common across Canada and can develop in many different environments, from coastal areas … Read more
Spring Flooding
What Is Spring Flooding? Spring flooding occurs when seasonal snowmelt, rainfall and changing ground and river conditions cause water levels to rise and inundate normally dry land. It is one of the most important seasonal flood hazards in many parts of Canada. During winter, large amounts of water can remain stored across the landscape as … Read more
River Flooding
What Is River Flooding? River flooding occurs when water levels in a river or stream rise high enough to overflow the normal channel and spread onto surrounding land. Flooding can develop gradually over several days or more rapidly when large amounts of water enter a watershed within a short period. In Canada, river flooding can … Read more
Flash Flooding
What Is Flash Flooding? Flash flooding is rapidly developing flooding that occurs when water levels rise quickly over a short period. It can develop when intense rainfall produces more water than the ground, waterways or drainage systems can handle. Unlike slower forms of flooding that may develop over several days, flash flooding can occur with … Read more