Weather
hideWeather is a set of all the phenomena occurring in a given atmosphere at a given time. Weather phenomena lie in the troposphere. Weather refers, generally, to day-to-day temperature and precipitation activity, whereas climate is the term for the average atmospheric conditions over longer periods of time. When used without qualification, "weather" is understood to be the weather of Earth.
Weather occurs due to density (temperature and moisture) differences between one place and another. These differences can occur due to the sun angle at any particular spot, which varies by latitude from the tropics. The strong temperature contrast between polar and tropical air gives rise to the jet stream. Weather systems in the mid-latitudes, such as extratropical cyclones, are caused by instabilities of the jet stream flow. Because the Earth's axis is tilted relative to its orbital plane, sunlight is incident at different angles at different times of the year. On Earth's surface, temperatures usually range ±40 °C (100 °F to −40 °F) annually. Over thousands to hundreds of thousands of years, changes in Earth's orbit affect the amount and distribution of solar energy received by the Earth and influence long-term climate
Surface temperature differences in turn cause pressure differences. Higher altitudes are cooler than lower altitudes due to differences in compressional heating. Weather forecasting is the application of science and technology to predict the state of the atmosphere for a future time and a given location. The atmosphere is a chaotic system, so small changes to one part of the system can grow to have large effects on the system as a whole. Human attempts to control the weather have occurred throughout human history, and there is evidence that human activity such as agriculture and industry has inadvertently modified weather patterns.
Studying how the weather works on other planets has been helpful in understanding how weather works on Earth. A famous landmark in the Solar System, Jupiter's Great Red Spot, is an anticyclonic storm known to have existed for at least 300 years. However, weather is not limited to planetary bodies. A star's corona is constantly being lost to space, creating what is essentially a very thin atmosphere throughout the Solar System. The movement of mass ejected from the Sun is known as the solar wind.
For more information about Weather, read the full article at
Wikipedia.
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News tagged with weather
NRL Sensor Observes First Light
Space & Earth / Space Exploration
18 hours ago |
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The Special Sensor Ultraviolet Limb Imager (SSULI) developed by NRL's Spacecraft Engineering Department and Space Science Division, launched October 18, 2009 on the U.S. Air Force Defense Meteorological Satellite ...
China to launch second lunar probe: state media
Space & Earth / Space Exploration
Nov 27, 2009 |
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China will launch its second moon orbiter next October, state media reported Friday, as it powers ahead with a space programme that has sparked concerns abroad.
Venezuela turns to cloud-seeding to battle drought
Space & Earth / Earth Sciences
Nov 29, 2009 |
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(AP) -- Hugo Chavez says he is starting to "bombard" clouds now that Cuba has provided Venezuela with cloud-seeding help in an effort to produce rain and alleviate the effects of a severe drought.
Australia issues 'catastrophic' alerts as fires rage
Nov 21, 2009 |
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Australia has issued "catastrophic" alerts after record-breaking temperatures and wild lightning storms sparked more than 100 fires across the country, officials said Saturday.
NASA's Ares I-X moon rocket makes first test flight
Space & Earth / Space Exploration
Oct 28, 2009 |
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(PhysOrg.com) -- NASA's Ares I-X test rocket lifted off at 11:30 a.m. EDT Wednesday from NASA's Kennedy Space Center in Florida for a two-minute powered flight.
A lightning strike in Africa helps take the pulse of the sun
Space & Earth / Space Exploration
Nov 11, 2009 |
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Sunspots, which rotate around the sun's surface, tell us a great deal about our own planet. Scientists rely on them, for instance, to measure the sun's rotation or to prepare long-range forecasts of the Earth's ...
Time Warner Cable asks help on rising program fees
Nov 25, 2009 |
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(AP) -- Time Warner Cable Inc. is asking the public for help as it tries to curtail increases in the programming fees it has to pay to carry cable channels and broadcast stations on its systems.
Noise Evidence Could Expand Hurricane Record
Space & Earth / Earth Sciences
Nov 10, 2009 |
5 / 5 (3) |
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As sea-surface temperatures rise across the globe, some scientists believe that hurricane frequency and intensity may increase. A fresh technique offers promise to generate new data from long-dead storms, ...
Glitch snarls air traffic in latest woes for FAA
Nov 19, 2009 |
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(AP) -- For the second time in a little more than a year, a glitch at one of the two centers that handle flight plans for the nation's air travel system set off delays and cancellations for passengers around ...
El Nino Could Play A Role In Colorado's Winter Weather, Scientist Says
Space & Earth / Earth Sciences
Nov 17, 2009 |
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(PhysOrg.com) -- El Nino, a warming event of the tropical Pacific Ocean that affects weather patterns in the United States and elsewhere, has strengthened in recent months and already appears to have influenced Colorado's ...
Broadcast pioneer NBC prepares for cable takeover
Nov 16, 2009 |
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(AP) -- Eight decades after pioneering the concept of broadcasting, NBC is on the verge of a startling move that illustrates broadcast television's decline.
Beijing's first snow of season 'artificially induced'
Nov 01, 2009 |
3.3 / 5 (6) |
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Chinese meteorologists covered Beijing in snow Sunday after seeding clouds to bring winter weather to the capital in an effort to combat a lingering drought, state media reported.
Competitive, trade-friendly nations weather volatile crop yields best
Nov 23, 2009 |
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Richer nations with competitive crop production and few trade barriers would fare the best if climate change, weather events or other factors cause yields of grain and oilseed crops to become more volatile, a new study has ...
NASA fuels space shuttle Atlantis for liftoff
Space & Earth / Space Exploration
Nov 16, 2009 |
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(AP) -- NASA is fueling space shuttle Atlantis for its afternoon liftoff.
Astronauts board space shuttle Atlantis for launch
Space & Earth / Space Exploration
Nov 16, 2009 |
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(AP) -- Astronauts climbed aboard space shuttle Atlantis on Monday for an afternoon liftoff to the space station, as the sky over the launching site gradually cleared.
