While clouds show up in unlimited shapes and also sizes they loss into some straightforward forms. From his Essay of the changes of Clouds (1803) Luke Howard separated clouds into three categories; cirrus, cumulus and also stratus.
You are watching: What does the prefix cirro mean
The elevation of Clouds
The traditional division between the Polar and Temperate areas is the Arctic circle (66.5°N) in the north Hemisphere and the Antarctic one (66.5°S) in the southerly Hemisphere. The department between the Temperate and also Tropical regions are the Tropics that Cancer (23.5°N) in the north Hemisphere and also the Tropics the Capricorn (23.5°S) in the southern Hemisphere.
The actual division between these areas varies from day come day and also season to season. Between the Polar and Temperate areas lies the jet stream in both hemispheres, if the Sub-Tropical Jet present divides the Temperate and also Tropical Regions.
One result of this cores of solid wind is the preferably altitude that the tropopause to reduce in each an ar as one moves from the equator to the poles. Generally, as the tropopause's height decreases, the elevations at which clouds occur also decreases.
The exception is for low clouds which room officially stated to have actually cloud bases in ~ the first 6,500 feet (2,000 meters) of the surface in every region. However even the is not always the case.
The basic of cumulus and also cumulonimbus clouds have the right to sometimes be higher than 6,500 feet (2,000 meters). During summertime, the basic of these convective clouds will certainly be fine in to the mid-level cloud variety in the non-mountainous areas of the southwest united States.
Cumulus cloud bases have been observed up to 9,000 feet (2,750 meters) end North main Texas and also thunderstorms, v cloud bases indigenous 11,000 to 12,000 feet (3,350 come 3,650 meters), have developed near mountain Angelo, Texas.
This wake up when, in spite of the dry reduced level the the atmosphere, the atmosphere in the mid-levels is relatively moist and also unstable. The dryness the the reduced level is such the parcels the air need to rise up to two miles (3 km), and also sometimes more, prior to the lock cool to the point of condensation.
|10,000-25,000 feet (3-8 km)||16,500-45,000 Feet (5-14 km)||20,000-60,000 feet (6-18 km)|
|6,500-13,000 feet (2-4 km)||6,500-23,000 feet (2-7 km)||6,500-25,000 feet (2-8 km)|
|Surface-6,500 feet (0-2 km)||Surface-6,500 feet (0-2 km)||Surface-6,500 feet (0-2 km)|
Since the jet stream complies with the sun, the shifts towards the equator as winter progresses. Therefore, the polar region expands and the temperate an ar moves toward the equator. In summer, the Tropical region expands moving the temperate an ar toward the poles when the polar region shrinks.
See more: What Is A Family Of Turkeys Called ? A Group Of Turkeys Is Called A Rafter
Learning Lesson: A 'Hole' most Clouds 1