Weather forecasting is the application of science and technology to predict the state of the atmosphere The Earth's atmosphere is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention , and reducing temperature extremes between day and night. Dry air contains roughly (by volume) 78.08% nitrogen, 20.95 for a future time and a given location. Human beings have attempted to predict the weather Weather 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, " informally for millennia, and formally since at least the nineteenth century. Weather forecasts are made by collecting quantitative data Data are pieces of information that represent the qualitative or quantitative attributes of a variable or set of variables. Data are typically the results of measurements and can be the basis of graphs, images, or observations of a set of variables. Data are often viewed as the lowest level of abstraction from which information and knowledge are about the current state of the atmosphere and using scientific understanding of atmospheric processes Meteorology is the interdisciplinary scientific study of the atmosphere that focuses on weather processes and forecasting (in contrast with climatology). Studies in the field stretch back millennia, though significant progress in meteorology did not occur until the eighteenth century. The nineteenth century saw breakthroughs occur after observing to project how the atmosphere will evolve.
Once an all-human endeavor based mainly upon changes in barometric pressure Atmospheric pressure is sometimes defined as the force per unit area exerted against a surface by the weight of air above that surface at any given point in the Earth's atmosphere. In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low pressure, current weather conditions, and sky condition, forecast models Numerical weather prediction uses current weather conditions as input into mathematical models of the atmosphere to predict the weather. While the first efforts to accomplish this were done in the 1920's, it wasn't until the advent of the computer that it was feasible to do in real-time. Manipulating the huge datasets and performing the complex are now used to determine future conditions. Human input is still required to pick the best possible forecast model to base the forecast upon, which involves pattern recognition skills, teleconnections Teleconnection in atmospheric science refers to climate anomalies being related to each other at large distances . The most emblematic teleconnection is that linking sea-level pressure at Tahiti and Darwin, Australia, which defines the Southern Oscillation, knowledge of model performance, and knowledge of model biases. The chaotic Chaos theory is that branch of mathematics which studies the behavior of certain dynamical systems that may be highly sensitive to initial conditions. This sensitivity is popularly referred to as the butterfly effect. As a result of this sensitivity, which manifests itself as an exponential growth of error, the behavior of chaotic systems appears nature of the atmosphere, the massive computational power required to solve the equations that describe the atmosphere, error involved in measuring the initial conditions, and an incomplete understanding of atmospheric processes mean that forecasts become less accurate as the difference in current time and the time for which the forecast is being made (the range of the forecast) increases. The use of ensembles and model consensus help narrow the error and pick the most likely outcome.
There are a variety of end uses to weather forecasts. Weather warnings are important forecasts because they are used to protect life and property. Forecasts based on temperature In physics, temperature is a physical property of a system that underlies the common notions of hot and cold; something that feels hotter generally has the higher temperature. Temperature is one of the principal parameters of thermodynamics. If no heat flow occurs between two objects, the objects have the same temperature; otherwise heat flows and precipitation In meteorology, precipitation is any product of the condensation of atmospheric water vapour that is deposited on the Earth's surface. The main forms of precipitation include rain, snow, ice pellets, and graupel. It occurs when the atmosphere, a large gaseous solution, becomes saturated with water vapour and the water condenses, falling out of are important to agriculture Agriculture encompasses a wide variety of specialties and techniques, including ways to expand the lands suitable for plant raising, by digging water-channels and other forms of irrigation. Cultivation of crops on arable land and the pastoral herding of livestock on rangeland remain at the foundation of agriculture. In the past century there has, and therefore to traders within commodity markets. Temperature forecasts are used by utility companies to estimate demand over coming days. On an everyday basis, people use weather forecasts to determine what to wear on a given day. Since outdoor activities are severely curtailed by heavy rain Rain is liquid precipitation, as opposed to other kinds of precipitation such as snow, hail and sleet. On Earth, it is the condensation of atmospheric water vapor into drops heavy enough to fall, often making it to the surface. Rain is the primary source of fresh water for most areas of the world, providing suitable conditions for diverse, snow Snow is a type of precipitation in the form of crystalline water ice, consisting of a multitude of snowflakes that fall from clouds. Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft structure, unless packed by external pressure. Snowflakes come in a variety of sizes and shapes. Types which and the wind chill Wind chill is the apparent temperature felt on exposed skin due to wind. The degree of this phenomenon depends on both air temperature and wind speed. The wind chill temperature is always lower than the air temperature for values where the wind chill formula is valid. In cases where the apparent temperature is higher than the air temperature, the, forecasts can be used to plan activities around these events, and to plan ahead and survive them.
Contents |
CNET News
The beautifully named Barry Grommett from the Met Office told the Mail: "We would be throwing ourselves back into the Dark Ages of weather forecasting , ...
Weather Supercomputer One of Worst Polluters in UK Gearlog
Climate-change supercomputer causes pollution storm Christian Science Monitor
Met Office among our worst polluters Western Morning News
energyhelpline.com
all 33 news articles »
Ellen Wallace
Sun, 30 Aug 2009 11:23:07 GM
The conference agenda is wide-ranging and includes improvements to early warning systems for disasters and how to provide more precise and more localized . weather forecasting. , needed by developing countries as well as industries in the ...
Q. it sounds like there are some more skys how come ?
Asked by bronis k - Sat Jan 17 21:34:21 2009 - - 2 Answers - 0 Comments
A. Because they're forecasting for multiple areas.
Answered by Will - Sat Jan 17 21:38:46 2009
