A low pressure system , a system that has lower pressure in it's center than in the areas around it, creates wind that causes warm moist air to rise, as the air rises it cools, the cool air becomes saturated with water vapor causing the vapor to condense forming clouds. Warm air masses in the northern hemisphere move from the southwest to the northeast while cold air masses move from the northeast to the southwest.
When a warm air mass "collides" with a cold air mass moving in the opposite direction the warm air mass is pushed above the cold air mass and the water vapor suspended in the clouds of the warm air condense even further resulting in rain. To make things a little easier to understand here's a pictorial depiction:.
What type of weather do warm fronts bring? Earth Science. Jun 29, Warm fronts typically bring rain. As this warm moist air rises it cools and the water vapor condenses into rain. So a warm air mass tends to bring with it plenty of rain and drizzle.
Since a warm front extends further forward at higher altitudes, this rain frequently starts to fall before the front reaches you at ground level. Once the front passes over, the rain often eases off but occasional drizzly patches are likely to follow on behind in the warm sector. A cold air mass has a much smaller moisture capacity, so there isn't the same extensive rain as in a warm air mass.
Most people think of a blizzard as a bad snowstorm, but a winter storm must meet certain criteria to be classified as a blizzard. According to the National Weather Service, a blizzard is a weather event that includes low temperatures, wind speeds greater than 56 kilometers 35 miles per hour, and a large amount of falling or blowing snow that lowers visibility to 0.
These whiteout conditions can cause car accidents and people on foot to become lost. Additionally, the colder temperatures that often follow a blizzard can put people at risk of frostbite or hypothermia. Explore more about blizzards with this collection of resources. One of the first things you probably do every morning is look out the window to see what the weather is like. Join our community of educators and receive the latest information on National Geographic's resources for you and your students.
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