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weather.com - local weather forecasts, radar and reports from The... doctorsmemorial.com | Your Weather (Search FastHealth.com) Your Weather smcfasthealth.com | Your Weather (Search FastHealth.com) Your Weather caryfasthealth.com | Your Weather (Search FastHealth.com) Your Weather charlottefasthealth.com |
The Weather PortalWeather is an all-encompassing term used to describe all of the many and varied phenomena that occur in the atmosphere of a planet at a given time. The term usually refers to the activity of these phenomena over short periods of hours or days, as opposed to the term climate, which refers to the average atmospheric conditions over longer periods of time. When used without qualification, "weather" is understood to be the weather of Earth. Weather most often results from temperature differences from one place to another, caused by the Sun heating areas near the equator more than the poles, or by different areas of the Earth absorbing varying amounts of heat, due to differences in albedo, moisture, and cloud cover. Surface temperature differences in turn cause pressure differences. A hot surface heats the air above it and the air expands, lowering the air pressure. The resulting pressure gradient accelerates the air from high to low pressure, creating wind, and Earth's rotation causes curvature of the flow via the Coriolis effect. These simple systems can interact, producing more complex systems, and thus other weather phenomena. The strong temperature contrast between polar and tropical air gives rise to the jet stream. Most weather phenomena in the mid-latitudes are caused by instabilities of the jet stream flow (see baroclinity) or by weather fronts. Weather systems in the tropics are caused by different processes, such as monsoons or organized thunderstorm systems. Because the Earth's axis is tilted relative to its orbital plane, sunlight is incident at different angles at different times of the year. In June the Northern Hemisphere is tilted towards the sun, while in December it is tilted away, causing yearly changes in the weather known as seasons. In the mid-latitudes, winter weather often includes snow and sleet, while in both the mid-latitudes and most of the tropics, tropical cyclones form in the summer and autumn. Almost all weather phenomena can occur year-round on different parts of the planet, including snow, rain, lightning, and, more rarely, hail and tornadoes. Related portals: Earth sciences (Atmosphere · Atmospheric Sciences · Atmospheric Sciences) · Tropical cyclones Selected picture An animation of changing snow cover across the Earth over the period of a year. Snow cover is much more abundant in the Northern Hemisphere, which is not surprising considering that the large majority of land in the colder latitudes is in the Northern Hemisphere. Antarctica is perennially covered by snow or ice cap, except for a few places in the Antarctic Peninsula and the McMurdo Dry Valleys. Recently selected pictures: Snow flakes, Sun dogs, Pyrocumulus clouds, More... Selected article The Christmas 1994 nor'easter was an intense cyclone along the East Coast of the United States and Atlantic Canada. It developed from an area of low pressure in the southeast Gulf of Mexico near the Florida Keys, and moved across the state of Florida. As it entered the warm waters of the Gulf Stream in the Atlantic Ocean, it began to rapidly intensify, exhibiting traits of a tropical system, including the formation of an eye. It attained a pressure of 970 millibars on December 23 and 24, and after moving northward, it came ashore near New York City on Christmas Eve. Due to the uncertain nature of the storm, the National Hurricane Center (NHC) did not classify it as a tropical cyclone. Heavy rain from the developing storm contributed to significant flooding in South Carolina. Much of the rest of the East Coast was affected by high winds, coastal flooding, and beach erosion. New York State and New England bore the brunt of the storm; damage was extensive on Long Island, and in Connecticut, 130,000 households lost electric power during the storm. Widespread damage and power outages also occurred throughout Rhode Island and Massachusetts, where the storm generated 30-foot (9.1 m) waves along the coast. Due to the warm weather pattern that contributed to the storm's development, precipitation was limited to rain. Two people were killed, and damage amounted to at least $21 million dollars. Recently selected articles: Evansville Tornado of November 2005,Typhoon Tip, Hurricane Floyd, More... Did you know......that a fallstreak holes are cloud phenomena which are often mistaken for unidentified flying objects? ...that the Pakistan Remote Sensing Satellite is Pakistan's first remote sensing satellite? ...that HURDAT is a database of all known tropical cyclones in the northern Atlantic Ocean since 1851? ...that the 1995 Mayfest Storm was the costliest hailstorm in US history, and injured more than 100 people? ...that the Effects of Hurricane Hazel in Canada included flooding which killed 81 people? ...that the International Cloud Atlas was first published in 1896, yet is still in print? Recent and ongoing weather This week in weather history...November 30: End of the East Pacific, Central Pacific and Atlantic hurricane seasons1925: A late-season hurricane made landfall just south of Tampa, Florida, eventually killing 59 people. Portal:Weather/On this day list/December 1 December 21996: The final WSR-57 weather radar was decommissioned. December 31999: European windstorm Anatol struck the coast of Sweden, Denmark, and Germany with wind gusts of 175 kilometers per hour (109 mph), causing over $2 billion in damage. 2004: Cyclone Agni, a very rare tropical cyclone which approached and may have even crossed the equator, dissipated just off the Somali coast. December 42005: Hurricane Epsilon, the longest lived December Atlantic hurricane in history, reached peak intensity over the open ocean. December 51898: United States President William McKinley issued a declaration which led to the formation of the National Hurricane Center. 1952: The Great Smog descended on London, eventually leading to around 12,000 deaths from respiratory infections. 1953: An F5 tornado killed 38 people near Vicksburg, Mississippi. Portal:Weather/On this day list/December 6 Selected biographySakuhei Fujiwhara (藤原咲平 Fujihara Sakuhei, October 29, 1884 – September 22, 1950) was a Japanese meteorologist who became the namesake for the Fujiwhara effect, an important interaction when forecasting cyclone tracks, particularly tropical cyclones. Novelist Jiro Nitta is his nephew and mathematician Masahiko Fujiwara is his grandnephew. He preferred to spell his surname as Fujiwhara, which is unusual by modern standards: Hepburn romanization (Fujihara or Fujiwara) is more common after World War II. Japanese texts give the furigana for his name as either Fujihara, Fujiwara or both. Recently selected biographies: William Ferrel, John Dalton, More... Quality content
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CategoriesWeather: Meteorology | Atmosphere | Basic meteorological concepts and phenomena | Climate | Clouds | Cyclones | Floods | Precipitation| Seasons | Severe weather and convection | Snow | Storms | Tornadoes | Tropical cyclones | Weather events | Weather lore | Weather hazards | Weather modification | Weather prediction | Weather warnings and advisories| Winds WikiprojectsWikiProject Meteorology is a collaborative effort by dozens of Wikipedians to improve the quality of meteorology- and weather-related articles. If you would like to help, visit the project talk page, and see what needs doing. WikiProject Severe weather is a similar project specific to articles about severe weather. Their talk page is located here. WikiProject Tropical cyclones is a daughter project of WikiProject meteorology. The dozens of semi-active members and several full-time members focus on improving Wikipdia's coverage of tropical cyclones. WikiProject Non-tropical storms is a collaborative project to improve articles related to winter storms, wind storms, and extratropical weather. Wikipedia is a fully collaborative effort by volunteers. So if you see something you think you can improve, be bold and get to editing! We appreciate any help you can provide! What you can do
Associated WikimediaOther PortalsWikipedia portals: Culture · Geography · Health · History · Mathematics · Natural sciences · Philosophy · Religion · Society · Technology |
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