Ch 13.2
High-pressure system
A large body of circulation air with high pressure at its center
and lower pressure outside of the system.
Hurricanes
An intense tropical storm with wind execeding 199 km/h
Blizzard
Violent winter storm characterised by freezing, temperatures, strong winds, and blowing snow
Front
Warm Fronts
A boundary between two air masses.
Colds Fronts
When a colder air mass moves toward a warmer air mass. The cold air , which is denser than the warm air, pushes underneath the warm air mass.
When less dense air moves toward colder, denser air. The warm air rises as it glides above the cold air mass.
Sationary and Occluded Fronts
When the boundary between two ai rmasses.
Air mass
Large bodies of air that have uniform
temperature , humidity, and pressure.
Classification
Continental tropical air mass. Hot and dry. They bring clear skies and high temperature. Usually form during summer.
Artic Air Masses - forming over Siberian an the Artic. Contain massivelly cold air and during winter the temperature can reach -40°
Continental Polar Air Masses - The air is dry. Fast - moving air masses and bring cold temperatures in the winter and cool weather in summer
Maritime Polar air mass - Forming over the Northem Atlantic and Pacific Ocean. Temperature is cold and humid. Often bring clouds and rainy weather
Maritime Tropical Air Mass - Form over the western Atlantic ocean, the guff of Mexico and the eastern pacific ocean. Hot and humid.
Thunderstorms
A typical thunderstorm has three stages. The cumulus is dominated by cloud formation and updrafts
Tornado
A violent, whirling column of air in contact with the ground.