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A larger body of air (500-1600 miles across in diameter) with relatively uniform temperature and moisture, typically with a homogenous source origin is called?
Hurricane->Tropical storm->Tropical depression
Ranks tropical cyclones in order of decreasing wind speed.
Vertical tilt with height
Characteristic that distinguishes hurricane from mid latitude cyclones in the northern hemisphere.
Origin of Air Masses
Develops by remaining over a uniform land or sea surface long enough to acquire the temperature/humidity/stability of the surface below.
Artic/Antarctic - Antarctica, Artic Ocean and fringes, and Greenland.
[ Very cold, very dry, very stable ]
Continental Polar - High latitude plains of Eurasia and North America.
[ Cold, dry, very stable ]
Maritime Polar - Oceans in vicinity of 50 - 60 degrees N and S latitude.
[ Cold, moist, relatively unstable ]
Characteristics of Atmospheric Disturbances
Extremely variable in size, migratory and transient, brief duration, and relatively predictable in weather conditions.
Mid Latitude Disturbances
Principal battleground of tropospheric phenomena: where polar and tropical air masses meet, where most fronts occur, and where weather is most dynamic and changeable from season to season and from day to day.
same weather day after day, week after week and month after month. Almost the only breaks are provided by transient atmospheric disturbances. Mostly tropical cyclones - known as hurricanes.
Mid latitude cyclones
Probably most significant of all atmospheric disturbances. Typically has a diameter of 1600 km. Counterclockwise converging circulation. Attracts cool air from the north and warm air from the south.
Mid latitude Anticyclones
Major disturbance in the general flow of the westerlies. Referred to as a 'HIGH' (H). Typically larger than a mid latitude cyclone and generally moves west to east. Clockwise in Northern Hemisphere and counterclockwise in Southern Hemisphere.
Long but weak migratory, low pressure system that may occur almost anywhere between 5 and 30 degrees latitude.
Intense, low pressure disturbances that develop in the tropics and occasionally move poleward into the mid latitudes.
Has wind speeds less than 33 knots (61 km or 38 mph) but has developed a closed wind circulation pattern.
Which of the following best represents the length of the life cycle of a typical midlatitude cyclone?
Properties of an air mass
Large, relatively uniform, travel as recognizable entity, must modify as it leaves its source region.
When neither air mass displaces the adjacent one, their boundary is called a(n) ________ front.
Extratropical cyclones and anticyclones function as migratory perturbations in the ________.
On a weather map, a symbol consisting of triangles arranged along one side of a line indicates a(n) ________ front.
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