Weather
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Weather is the state of the atmosphere, to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudy. Most weather phenomena occur in the troposphere, just below the stratosphere. 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 is driven by 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 of years, changes in Earth's orbit affect the amount and distribution of solar energy received by the Earth and influence long-term climate and global climate change. 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. Part of the Nature series on Weather Calendar seasons Spring · Summer Tropical seasons StormsThunderstorm · Supercell Downburst · Lightning Tornado · Waterspout Tropical cyclone (Hurricane) Extratropical cyclone Winter storm · Blizzard · Ice storm Dust storm · Firestorm · Cloud PrecipitationDrizzle · Rain · Snow · Graupel Freezing rain · Ice pellets · Hail TopicsMeteorology · Climate Weather forecasting Heat wave · Air pollution Cold wave Weather portalFrom Wikipedia under the
GNU Free Documentation License Matching Results for Weather:Michael FishMade during the weather forecast.[1] Although this quote is popularly supposed to be related to the "Great Storm" which struck southern England ... Groundhog Day (film) This is one time where television really fails to capture the true excitement of a large squirrel predicting the weather. I was in the Virgin Islands once. ... John Lubbock, 1st Baron Avebury We often hear of bad weather, but in reality no weather is bad. ... Some weather may be bad for farmers or crops, but for man all kinds are good. ... From Wikiquote under the
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