High Level Clouds cloud classifications
Photograph by: Knupp
High-Level Clouds ...
High-level clouds Cirrus, Cirrocumulus and Cirrostratus are high-level clouds.
A high, high-pressure cell, or high pressure area is a region where the atmospheric pressure is greater than the surrounding area. In some countries, these regions may be referred to as anticyclones.
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* * High Clouds 18,000 to 30, ...
high clouds - See cloud classification.
horizon - One of several lines or planes used as reference for observation and measurement relative to a given location on the surface of the earth, and referred generally to a horizontal direction (i.e.
High and Low Pressure Systems
Introduction
Regions of sinking air are called highs, high pressure regions or anticyclones. Clear skies and fair weather usually occur in these regions.
High Risk (of severe thunderstorms) - Severe weather is expected to affect more than 10 percent of the area. A high risk is rare, and implies an unusually dangerous situation and usually the possibility of a major severe weather outbreak.
high water"(Popularly called high tide.) The maximum water level reached in a tidal cycle.
High Level Activities
ARM and the Recovery Act
Contributions to International Polar Year
ARM Climate Research Facility Expansion Workshop (PDF, 1,493K) ...
HIGH CLOUDS
A term used to signify cirriform clouds that are composed of ice crystals and generally have bases above 20,000 feet. The main types of high clouds are cirrus,cirrocumulus, and cirrostratus. This altitude applies to the temperate zone.
High Pressure
A mass of air that presses down strongly on the surface of the Earth because it is being cooled and is therefore more dense
Humidity ...
High Wind Advisory- This product is issued when high wind speeds may pose a hazard.
High Wind Warning- Issued when sustained winds will be 40 mph or greater for at least one hour, or any gust of wind expected to be 58 mph or greater.
High - in meteorology, an region of high pressure; see also anticyclone ...
High cloud
High latitudes
The latitude belt roughly between 60° and 90° North and South.
High A region of high pressure, marked as a blue "H" on a weather map. A high is usually associated with fair weather. See anticyclone.
HIGH: The center of an area of high pressure, usually accompanied by anticyclonic and outward wind flow. Also known as an anticyclone.
HIGH WIND: Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.
High
(abbrev. HI)- In meteorology, a region of high pressure; also known as anticyclone.
High Clouds ...
High Pressure - An area of a relative pressure maximum that has diverging winds and rotates in the opposite direction as the earth.
HIGH WIND: Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.
HUMIDITY: The amount of water vapor in the atmosphere. (See relative humidity).
High Wind- the sustained wind of forty mph or greater and/or gust greater than fifty-eight mph.
Horse Latitudes- subtropical regions where anticyclones produce settled weather.
Humidity- the amount of water vapor present in the air.
high clouds: clouds found between 3-8 kilometers (10000-25000 feet) in polar regions and 6-18 kilometers (20000-60000 feet) in tropical regions. Contains cirriform clouds (cirrus, cirrocumulus, and cirrostratus).
High Pressure - In the Northern Hemisphere, an area of high atmospheric pressure with a closed, clockwise movement of air (circulation). Also known as an anticylone.
High inversion fog A fog that lifts above the surface but does not completely dissipate because of a strong inversion (usually subsidence) that exists above the fog layer.
High Cloud - A cloud that normally has its base above 6000 meters; the base may be lower in winter and at high-latitude locations.
high—An area of high barometric pressure, with its attendant system of winds; an anticyclone. Also high pressure system.
hoar frost—See frost.
High Wind Watch- Issued when conditions are favorable for the development of high winds over all of or part of the forecast area but the occurrence is still uncertain.
High-Resolution Picture Transmission (HRPT) Real-time, 1.1-kilometer resolution, digital images provided by NOAA's polar-orbiting environmental satellites, ...
High Wind Warning: A high wind warning is defined as 1-minute average surface winds of 35 kt (40 mph or 64 km/hr) or greater lasting for 1 hour or longer, ...
HP- High Precipitation supercell; It is a supercell with a high moisture content. Precipitation will wrap completely around the updraft region in an HP supercell. They have a kidney bean shape on radar reflectivity.
HVY- Heavy ...
WARM HIGH
A high pressure system that has its warmest temperatures at or near the center of circulation. Contrast with a cold high.
Omega High: A blocking ridge of high pressure that forms in the middle or upper troposphere. It looks like the Greek letter omega.
ultra high frequency (UHF) - permalink - collapse
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Polar high Cold anticyclone that originates in a source region for continental polar air.
Polar-orbiting satellite A satellite in relatively low orbit that travels near the geographical poles on meridional trajectories.
Omega High An omega high is a ridge of high pressure which disrupts the normal westerly flow pattern across North America. On a surface or upper air map of the pressure pattern it shows up as a feature which looks like the Greek letter omega.
Bubble High - A mesoscale area of high pressure, typically associated with cooler air from the rainy downdraft area of a thunderstorm or a complex of thunderstorms. A gust front or outflow boundary separates a bubble high from the surrounding air.
BUBBLE HIGH A small high that may be created by precipitation and vertical instability associated with thunderstorm activity. A product of downdrafts, it is relatively cold and often has the characteristics of a different air mass.
Bermuda High: The semi-permanent, subtropical anticyclone located over the western North Atlantic Ocean at about 30°N.
high pressure system- an area of high barometric pressure that rotates clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.
HIGH: An area of high pressure around which the wind blows clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.
HUMIDITY: Generally the measure of the water vapor content of the air.
High- An area of higher atmospheric pressure.
Hurricane- A tropical cyclone in the western hemisphere that has sustained wind speeds of 74 miles per hour or greater.
Hydrosphere- The Earth's water.
HIGH PRESSURE SYSTEM - An area of high atmospheric pressure which generally means good visibility for flying.
HORIZONTAL COMPONENT OF LIFT - Another term for centripetal force. The center-seeking force which causes an airplane to turn.
High Pressure System - A whirling mass of cool, dry air that generally brings fair weather and light winds. When viewed from above, winds spiral out of a high-pressure center in a clockwise rotation in the Northern Hemisphere. These bring sunny skies.
High clouds are primarily composed of ice crystals; Medium clouds are a mixture of water droplets (usually super-cooled) and ice crystals, in varying proportion, and low clouds primarily water droplets, ...
HIGH PRESSURE - A region of high air pressure in the atmosphere. Commonly associated with fair weather. Strong high-pressure regions may cause strong outflow winds.
See high.
Arctic sea smoke
A type of fog which is formed when cold air moves over relatively warm water.
Azores high
A semi-permanent area of high pressure often centred around the Azores in the mid-Atlantic. It is caused by the air at high levels moving out from the equatorial regions slowing down at about 30 degrees north and descending.
A summer high over the North American continent brings moist, unstable maritime tropical air from the Gulf over the Mississippi Valley. The thunderstorms that result are the principal source of moisture for this region.
Cirrus A high cloud composed of ice crystals in the form of thin, white, featherlike clouds in patches, filaments, or narrow bands.
Anticyclone- A high-pressure center of dry air.
Atmosphere- The layer of gases that surrounds Earth.
Blizzard - High winds and reduced visibilities caused by blowing snow. Low temperatures as well. Exact definitions vary by region.
Boundary layer - the part of the atmosphere closest to the ground.
Bermuda HighA semi-permanent, subtropical area of high pressure in the North Atlantic Ocean off the East Coast of North America that migrates east and west with varying central pressure. Depending on the season, it has different names.
jet stream: high speed air flow in the atmosphere forming air rivers several hundred miles across that generally move west to east and mark the boundary that separates two global air masses with significant differences in temperature.
ULJUpper Level JetUltra High Frequency (UHF)Those radio frequencies exceeding 300 MHzUltraviolet IndexThis index provides important information to help you plan your outdoor activities in ways that prevent overexposure to the sun's rays.
Cirrus (Ci): High clouds composed of ice-crystals that are whitish in color and can appear as filaments, patches or narrow bands.
Ridge
(Ridge of High Pressure) Region of the atmosphere in which the pressure is high relative to the surrounding region at the same level.
Channeled High WindsIn mountainous areas or in cities with tall buildings, air may be channeled through constricted passages producing high winds.
(Often shortened to "towering cu," and abbreviated TCU.)TPC(Tropical Prediction Center) - An NCEP center which produces marine offshore and high seas forecasts south of 30N in the Eastern Pacific, Gulf of Mexico and Caribbean.
Scintillometer A type of photoelectric photometer used to measure high-altitude winds on the assumption that stellar scintillation is caused by atmospheric inhomogeneities being carried along by wind near the tropopause level.
THERMAL LOW Also known as heat low, it is an area of low pressure due to the high temperatures caused by intensive heating at the surface. It tends to remain stationary over its source area, with weak cyclonic circulation.
AnticyclogenesisThe formation or intensification of an anticyclone or high pressure center.
 See also: Air, Weather, Surface, Temperature, Water
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