 A large low-pressure system swirls off the southwestern coast of Iceland, illustrating the maxim that "nature abhors a vacuum." The vacuum in this case is a region of low atmospheric pressure. In order to fill this void, air from a nearby high-pressure system moves in, pulling in clouds along for the ride. And because this low-pressure system occurred in the Northern Hemisphere, the winds spun in toward the center of the low-pressure system in a counter-clockwise direction; a phenomenon known as the Coriolis effect (in the Southern Hemisphere, the Coriolis effect would be manifested in a clockwise direction of movement). September 4, 2003 A low pressure area, or a low for short, is a region where the atmospheric pressure is lowest with relation to the surrounding area. Tropical storms, extratropical cyclones, subpolar cyclones, and subarctic cyclones are called low-pressure cells in some English-speaking communities. ImageMetadata File history File links Download high resolution version (3500x3033, 2363 KB) A beautifully-formed low-pressure system swirls off the southeastern coast of Iceland, illustrating the maxim that nature abhors a vacuum. ...
ImageMetadata File history File links Download high resolution version (3500x3033, 2363 KB) A beautifully-formed low-pressure system swirls off the southeastern coast of Iceland, illustrating the maxim that nature abhors a vacuum. ...
In the inertial frame of reference (upper part of the picture), the black object moves in a straight line. ...
September 4 is the 247th day of the year (248th in leap years). ...
2003 (MMIII) was a common year starting on Wednesday of the Gregorian calendar. ...
Image:Tagesgang-luftdruck. ...
This article is about weather phenomena. ...
A mid-latitude cyclone or extratropical cyclone is a weather phenomenon associated with atmospheric low pressure that takes place in the temperate region between the tropical and polar regions. ...
Lows are frequently associated with stronger winds and atmospheric lift. This lift will generally produce cloud cover, due to adiabatic cooling, once the air becomes saturated. Thus, low pressure typically brings cloudy or overcast skies, which may minimize diurnal temperature extremes in both summer and winter, due to the significant cloud cover. This is due to less incoming shortwave solar radiation and lower temperatures, since the clouds reflect sunlight. At night, the absorptive effect of clouds on outgoing longwave radiation, such as heat energy from the surface, allows for warmer diurnal low temperatures in all seasons. Wind is the rough horizontal movement of air (as opposed to an air current) caused by uneven heating of the Earths surface. ...
Atmosphere may refer to: a celestial body atmosphere, e. ...
Cloud cover is the amount of the sky obscured by clouds when observed at a particular location. ...
The adiabatic lapse rate is the rate of temperature change that occurs in an atmosphere as a function of elevation, assuming that air behaves adiabatically. ...
Summer is a season that is astronomically defined as beginning around June 21, and ending around September 23 in the Northern Hemisphere. ...
Winter is one of the four seasons of temperate zones. ...
Shortwave radiation is a term used to describe the radiant energy emitted by the sun in the visible and near-ultraviolet wavelengths (between about 0. ...
Solar irradiance spectrum at top of atmosphere. ...
Fig. ...
Prism splitting light Sunlight in the broad sense is the total spectrum of the electromagnetic radiation given off by the Sun. ...
Longwave radiation is a term used to describe the infrared energy emitted by the earth and atmosphere at wavelengths between about 5 and 25 micrometers. ...
Climatologically, low pressure forms at the Intertropical convergence zone (ITCZ), as part of the Hadley cell circulation. Many of the world's rainforests are associated with these climatological low pressure systems. Frontal lows are temperate zone phenomena, and develop along the polar front as a result of the interaction between cold and warm surface air masses. Thermal lows also form over areas such as Death Valley as the result of intense ground heating; they are much smaller in geographic extent than either convergence lows or frontal lows. The thunderstorms of the Intertropical Convergence Zone form a line across the eastern Pacific Ocean. ...
The Hadley cell is a circulation pattern that dominates the tropical atmosphere, with rising motion near the equator, poleward flow 10-15 kilometers above the surface, descending motion in the subtropics, and equatorward flow near the surface. ...
A rainforest is a forested biome with high annual rainfall. ...
A guide to the symbols for weather fronts that may be found on a weather map: 1. ...
In geography, temperate latitudes of the globe lie between the tropics and the polar circles. ...
Atmospheric circulation is the large-scale movement of air, and the means (together with the ocean circulation, which is smaller [1]) by which heat is distributed on the surface of the Earth. ...
In meteorology, an air mass is a large volume of air having fairly uniform characteristics of temperature, atmospheric pressure, and water vapor content. ...
Death Valley and Panamint Range The salt lake at Badwater, Death Valley is the lowest point in western hemisphere. ...
Surface low pressure systems will tend to be smaller in area and have stronger surface winds than a given high pressure system, due to the addition of surface friction to the pressure gradient force, centrifugal force and coriolis effect that drive the circulation. The pressure gradient force is the force that is usually responsible for accelerating a parcel of air from a high atmospheric pressure region to a low pressure region, resulting in wind. ...
Centrifugal force (from Latin centrum center and fugere to flee) is a term which may refer to two different forces which are related to rotation. ...
In the inertial frame of reference (upper part of the picture), the black object moves in a straight line. ...
Thermal low
In deserts, lack of ground and plant moisture that would normally provide evaporative cooling can lead to intense, rapid solar heating of the lower layers of air. The hot air is less dense than surrounding cooler air. This, combined with the rising of the hot air, results in an isolated low pressure area called a thermal low.
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