Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Weather shopping experience:

1. Compare - without doubt the biggest advantage that the Weather offers shoppers today is the ability to compare thousands of Weather at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.

2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about

3. Testimonials - don't know anybody that has bought a Weather? Wrong! If the Weather is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.

4. Questions - Got a question about Weather then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....

5. Reputation - Never heard of the company selling Weather? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Weather and build up a picture of their reputation for sales, returns, customer service, delivery etc.

6. Returns - still worried that even after all of the above your Weather wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.

7. Feedback - happy with your Weather then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.

8. Security - check for the yellow padlock on the Weather site before you buy, and the s after http:/ /i.e. https:// = a secure site

9. Contact - got a question about Weather, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.

10. Payment - ready to pay for your Weather, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.



For the geological process, see Weathering or Erosion. The weather is the set of all extant phenomena in a given atmosphere at a given time. The term usually refers to the activity of these phenomena over short periods (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.

Basic mechanism Weather most often results from temperature differences from one place to another. On large scales, temperature differences occur because areas closer to the equator receive more energy per unit area from the Sun than do regions closer to the polar region. On local scales, temperature differences can occur because different surfaces (such as oceans, forests, ice sheets, or man-made objects) have differing physical characteristics such as albedo, roughness, or moisture content.

Surface temperature differences in turn cause pressure differences. A hot surface heats the air above it and the air expands, lowering the Atmospheric pressure. The resulting horizontal pressure gradient accelerates the air from high to low pressure, creating wind, and Earth's rotation then causes curvature of the flow via the Coriolis effect. The simple systems thus formed can then display Emergence to produce more Pressure system and thus other weather phenomena. Large scale examples include the Hadley cell while a smaller scale example would be sea breeze.

The strong temperature contrast between polar and tropical air gives rise to the jet stream. Most weather systems in the mid-latitudes are caused by instabilities of the jet weather comes from, the Latin word for dark and scary stream flow (see baroclinic instability). Weather systems in the tropics are caused by different processes, such as monsoons or organized thunderstorm systems.

Because the Earth's Axis of rotation are 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, so at any given Northern Hemisphere latitude sunlight falls more directly on that spot than in December (see Effect of sun angle on climate). This effect causes seasons. Over thousands to hundreds of thousands of years, changes in Earth's orbital parameters affect the amount and distribution of solar energy received by the Earth and influence long-term climate (see Milankovitch cycles).

Terrestrial weather cloudsOn Earth, common List of meteorological phenomena include such things as wind, cloud, rain, snow, fog and dust storms. Less common events include natural disasters such as tornadoes, hurricanes and Winter storm. Almost all familiar weather phenomena occur in the troposphere (the lower part of the atmosphere). Weather does occur in the stratosphere and can affect weather lower down in the troposphere, but the exact mechanisms are poorly understood.

The Earth's atmosphere is a chaos theory, so small changes to one part of the system can grow to have large effects on the system as a whole. This makes it difficult to accurately predict weather more than a few days in advance, though weather forecasting are continually working to extend this limit through the scientific study of weather, Meteorology. It is theoretically impossible to make useful day-to-day predictions more than about two weeks ahead, imposing an upper limit to potential for improved prediction skill.Chaos theory says that the slightest variation in the motion of the air can grow with time. This idea is sometimes called the butterfly effect, from the idea that the motions caused by the flapping wings of a butterfly eventually could produce marked changes in the state of the atmosphere. Because of this sensitivity to small changes it will never be possible to make perfect forecasts, although there still is much potential for improvement.

Shaping the planet Weather is one of the fundamental processes that shape the Earth. The process of weathering breaks down rocks and soils into smaller fragments and then into their constituent substances. These are then free to take part in chemical reactions that can affect the surface further (e.g., acid rain) or are reformed into other rocks and soils. Weather also plays a major role in erosion of the surface.

Human history Weather has played a large and sometimes direct part in History of the world. Aside from climatic changes that have caused the gradual drift of populations (for example the desertification of the Middle East, and the formation of land bridges during glacial periods), Severe weather events have caused smaller scale population movements and intruded directly in historical events. One such event is the saving of Japan from invasion by the Mongol fleet of Kublai Khan by the Kamikaze (typhoon) winds in 1281. A series of great storms throughout the 13th century caused the powerful English Cinque Ports to be silted up and hence lose their influence. More recently, category fourHurricane Katrina forced the temporary abandonment of the entire city of [New Orleans LA in [2005.

Though weather affects people in drastic ways, it can also affect the human race in simpler ways. It has been noted that the human immune system is affected in extreme heat or cold. Mood (psychology) can also be affected by weather,making good or bad moods'hence the common scene of heavy downpour in [Soap operas when a person cries. Weather, in its power, however, cannot affect a person's performance, at work, school or play. It is the person's own mindset that leads to poor performance during times of bad weather, heat, cold or rain.

Forecasting that an United States newspaper might use. The numbers are temperature in degrees Fahrenheit, daytime high to the left and nighttime low to the right.

Weather forecasting is the application of science and technology to predict the state of the atmosphere at a future time. Prior to the advent of scientific methods of weather forecasting, a large body of weather lore developed to explain the weather. An example is the Groundhog Day celebration near the end of winter in parts of the United States and Canada, which forecasts whether spring is near or far depending on if the groundhog sees his shadow or not. Today, weather forecasts are made by collecting data that describe the current state of the atmosphere (particularly the temperature, humidity and wind) and using numerical weather prediction to determine how the atmosphere is expected to change in the future. The chaos theory of the atmosphere means that perfect forecasts are impossible, and that butterfly effect.

Weather modification and human impact The wish to weather control is evident throughout human history: from ancient rituals intended to bring rain for crops to the U.S. Military Operation Popeye, an attempt to disrupt supply lines by lengthening the North Vietnamese monsoon. The most successful attempts at influencing weather involve cloud seeding; they include the fog and low stratus dispersion techniques employed by major airports, techniques used to increase snow over mountains, and techniques to suppress hail. American Meteorological Society

Whereas there is inconclusive evidence for these techniques' efficacy, there is extensive evidence that human activity such as agriculture and industry results in inadvertent weather modification: American Meteorological Society The effects of inadvertent weather modification may pose serious threats to many aspects of civilization, including ecosystems, natural resources, food and fiber production, economic development, and human health. Intergovernmental Panel on Climate Change.

Extremes On earth, temperatures usually range between ±40°C. However, the wide range of climates and latitudes offer extremes of temperature well outside this range. The coldest air temperature ever recorded on Earth is -89.2°C (-127.8°F), at Vostok Station, Antarctica on 21 July 1983. The hottest air temperature ever recorded was 57.7°C (135.9°F), at Al 'Aziziyah, Libya, on 13 September 1922. The highest recorded average annual temperature was 34.4°C (94°F) at Dallol, Ethiopia, Ethiopia. The coldest recorded average annual temperature is -50.6°C (-59°F) at Vostok Station, Antarctica. The coldest average annual temperature in a permanently inhabited location is at Resolute, Nunavut, in Canada.

Extra-terrestrial weather Studying how the weather works on other planets has been seen as helpful in understanding how it works on Earth. Weather on other planets follows many of the same physical principles as weather on Earth, but occurs on different scales and in atmospheres having different chemical composition. The Cassini-Huygens mission to Titan (moon) discovered clouds formed from methane or ethane which deposit rain composed of liquid methane and other organic compounds. Earth's atmosphere includes about six latitudinal circulation zones, three in each hemisphere (see Hadley cell). In contrast Jupiter's banded appearance shows over a dozen such zones, Titan has a single cell covering its entire surface, and Venus (planet) appears to have no zones at all.

One of the most famous landmarks in the solar system, Jupiter (planet)'s Great Red Spot, is an Anticyclone storm known to have existed for at least 300 years. On other gas giants the lack of a surface allows the wind to reach enormous speeds: gusts of up to 400 metres per second (about 1440 km/h / 900 mi/h) have been measured on the planet Neptune. This has created a puzzle for Planetary Science. The weather is ultimately created by solar energy and the amount of energy received by Neptune is only about 1/900th of that received by Earth, yet the intensity of weather phenomena on Neptune is far greater than on Earth. The strongest planetary winds discovered so far are on the extrasolar planet HD 189733b, which is thought to have easterly winds moving at more than 9,600 kilometers per hour.

Extra-planetary weather 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.

Inconsistencies in this wind and larger events on the surface of the star, such as coronal mass ejections, form a system that has features analogous to conventional weather systems (such as pressure and wind) and is generally known as space weather. The activity of this system can affect planetary atmospheres and occasionally surfaces. The interaction of the solar wind with the terrestrial atmosphere can produce spectacular Aurora (phenomenon), and can play havoc with electrically sensitive systems such as Electric power transmission and radio signals.

References

See also



External link



For the geological process, see Weathering or Erosion. The weather is the set of all extant phenomena in a given atmosphere at a given time. The term usually refers to the activity of these phenomena over short periods (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.

Basic mechanism Weather most often results from temperature differences from one place to another. On large scales, temperature differences occur because areas closer to the equator receive more energy per unit area from the Sun than do regions closer to the polar region. On local scales, temperature differences can occur because different surfaces (such as oceans, forests, ice sheets, or man-made objects) have differing physical characteristics such as albedo, roughness, or moisture content.

Surface temperature differences in turn cause pressure differences. A hot surface heats the air above it and the air expands, lowering the Atmospheric pressure. The resulting horizontal pressure gradient accelerates the air from high to low pressure, creating wind, and Earth's rotation then causes curvature of the flow via the Coriolis effect. The simple systems thus formed can then display Emergence to produce more Pressure system and thus other weather phenomena. Large scale examples include the Hadley cell while a smaller scale example would be sea breeze.

The strong temperature contrast between polar and tropical air gives rise to the jet stream. Most weather systems in the mid-latitudes are caused by instabilities of the jet weather comes from, the Latin word for dark and scary stream flow (see baroclinic instability). Weather systems in the tropics are caused by different processes, such as monsoons or organized thunderstorm systems.

Because the Earth's Axis of rotation are 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, so at any given Northern Hemisphere latitude sunlight falls more directly on that spot than in December (see Effect of sun angle on climate). This effect causes seasons. Over thousands to hundreds of thousands of years, changes in Earth's orbital parameters affect the amount and distribution of solar energy received by the Earth and influence long-term climate (see Milankovitch cycles).

Terrestrial weather cloudsOn Earth, common List of meteorological phenomena include such things as wind, cloud, rain, snow, fog and dust storms. Less common events include natural disasters such as tornadoes, hurricanes and Winter storm. Almost all familiar weather phenomena occur in the troposphere (the lower part of the atmosphere). Weather does occur in the stratosphere and can affect weather lower down in the troposphere, but the exact mechanisms are poorly understood.

The Earth's atmosphere is a chaos theory, so small changes to one part of the system can grow to have large effects on the system as a whole. This makes it difficult to accurately predict weather more than a few days in advance, though weather forecasting are continually working to extend this limit through the scientific study of weather, Meteorology. It is theoretically impossible to make useful day-to-day predictions more than about two weeks ahead, imposing an upper limit to potential for improved prediction skill.Chaos theory says that the slightest variation in the motion of the air can grow with time. This idea is sometimes called the butterfly effect, from the idea that the motions caused by the flapping wings of a butterfly eventually could produce marked changes in the state of the atmosphere. Because of this sensitivity to small changes it will never be possible to make perfect forecasts, although there still is much potential for improvement.

Shaping the planet Weather is one of the fundamental processes that shape the Earth. The process of weathering breaks down rocks and soils into smaller fragments and then into their constituent substances. These are then free to take part in chemical reactions that can affect the surface further (e.g., acid rain) or are reformed into other rocks and soils. Weather also plays a major role in erosion of the surface.

Human history Weather has played a large and sometimes direct part in History of the world. Aside from climatic changes that have caused the gradual drift of populations (for example the desertification of the Middle East, and the formation of land bridges during glacial periods), Severe weather events have caused smaller scale population movements and intruded directly in historical events. One such event is the saving of Japan from invasion by the Mongol fleet of Kublai Khan by the Kamikaze (typhoon) winds in 1281. A series of great storms throughout the 13th century caused the powerful English Cinque Ports to be silted up and hence lose their influence. More recently, category fourHurricane Katrina forced the temporary abandonment of the entire city of [New Orleans LA in [2005.

Though weather affects people in drastic ways, it can also affect the human race in simpler ways. It has been noted that the human immune system is affected in extreme heat or cold. Mood (psychology) can also be affected by weather,making good or bad moods'hence the common scene of heavy downpour in [Soap operas when a person cries. Weather, in its power, however, cannot affect a person's performance, at work, school or play. It is the person's own mindset that leads to poor performance during times of bad weather, heat, cold or rain.

Forecasting that an United States newspaper might use. The numbers are temperature in degrees Fahrenheit, daytime high to the left and nighttime low to the right.

Weather forecasting is the application of science and technology to predict the state of the atmosphere at a future time. Prior to the advent of scientific methods of weather forecasting, a large body of weather lore developed to explain the weather. An example is the Groundhog Day celebration near the end of winter in parts of the United States and Canada, which forecasts whether spring is near or far depending on if the groundhog sees his shadow or not. Today, weather forecasts are made by collecting data that describe the current state of the atmosphere (particularly the temperature, humidity and wind) and using numerical weather prediction to determine how the atmosphere is expected to change in the future. The chaos theory of the atmosphere means that perfect forecasts are impossible, and that butterfly effect.

Weather modification and human impact The wish to weather control is evident throughout human history: from ancient rituals intended to bring rain for crops to the U.S. Military Operation Popeye, an attempt to disrupt supply lines by lengthening the North Vietnamese monsoon. The most successful attempts at influencing weather involve cloud seeding; they include the fog and low stratus dispersion techniques employed by major airports, techniques used to increase snow over mountains, and techniques to suppress hail. American Meteorological Society

Whereas there is inconclusive evidence for these techniques' efficacy, there is extensive evidence that human activity such as agriculture and industry results in inadvertent weather modification: American Meteorological Society The effects of inadvertent weather modification may pose serious threats to many aspects of civilization, including ecosystems, natural resources, food and fiber production, economic development, and human health. Intergovernmental Panel on Climate Change.

Extremes On earth, temperatures usually range between ±40°C. However, the wide range of climates and latitudes offer extremes of temperature well outside this range. The coldest air temperature ever recorded on Earth is -89.2°C (-127.8°F), at Vostok Station, Antarctica on 21 July 1983. The hottest air temperature ever recorded was 57.7°C (135.9°F), at Al 'Aziziyah, Libya, on 13 September 1922. The highest recorded average annual temperature was 34.4°C (94°F) at Dallol, Ethiopia, Ethiopia. The coldest recorded average annual temperature is -50.6°C (-59°F) at Vostok Station, Antarctica. The coldest average annual temperature in a permanently inhabited location is at Resolute, Nunavut, in Canada.

Extra-terrestrial weather Studying how the weather works on other planets has been seen as helpful in understanding how it works on Earth. Weather on other planets follows many of the same physical principles as weather on Earth, but occurs on different scales and in atmospheres having different chemical composition. The Cassini-Huygens mission to Titan (moon) discovered clouds formed from methane or ethane which deposit rain composed of liquid methane and other organic compounds. Earth's atmosphere includes about six latitudinal circulation zones, three in each hemisphere (see Hadley cell). In contrast Jupiter's banded appearance shows over a dozen such zones, Titan has a single cell covering its entire surface, and Venus (planet) appears to have no zones at all.

One of the most famous landmarks in the solar system, Jupiter (planet)'s Great Red Spot, is an Anticyclone storm known to have existed for at least 300 years. On other gas giants the lack of a surface allows the wind to reach enormous speeds: gusts of up to 400 metres per second (about 1440 km/h / 900 mi/h) have been measured on the planet Neptune. This has created a puzzle for Planetary Science. The weather is ultimately created by solar energy and the amount of energy received by Neptune is only about 1/900th of that received by Earth, yet the intensity of weather phenomena on Neptune is far greater than on Earth. The strongest planetary winds discovered so far are on the extrasolar planet HD 189733b, which is thought to have easterly winds moving at more than 9,600 kilometers per hour.

Extra-planetary weather 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.

Inconsistencies in this wind and larger events on the surface of the star, such as coronal mass ejections, form a system that has features analogous to conventional weather systems (such as pressure and wind) and is generally known as space weather. The activity of this system can affect planetary atmospheres and occasionally surfaces. The interaction of the solar wind with the terrestrial atmosphere can produce spectacular Aurora (phenomenon), and can play havoc with electrically sensitive systems such as Electric power transmission and radio signals.

References

See also



External link



BBC - Weather Centre - World Weather
Current conditions and forecasts for the UK and the world. Includes background material about weather including climate change, glossary, calculators, video tour of the BBC Weather ...

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BBC Weather forecast for the UK. ... Find out how to make your home look cosy and warm with BBC Homes. Get ideas on how to make special treats with BBC Food.

Weather Online UK - Current Weather and Forecasts Worldwide
Weather for UK, Ireland and the world. Weather maps, Weather warning, marine weather, Weather report, radar, satellite, climate, historic weather data, information about ...

WeatherOnline Spain
Weather, Warning, Watch

Metcheck.com - UK Weather Forecasts - Live Data - Long Range Weather ...
Forecasts for up to thirty days with current data, news, severe weather warnings, messageboards and links. Longer forecasts and specialised data by subscription.

Met Office: Weather and climate change
Forecasts and data for UK and the world, weather warnings, UV index, maps, marine information and satellite imagery. Describes the commercial weather and environmental services ...

Met Office: UK weather
The Met Office - The latest UK and international weather forecast. Global weather services for business and the public. UK weather warnings.

World and Local UK Weather Forecast, Map and Report weather.co.uk
Present details plus 10-day summary forecast for cities, with maps for shorter periods ahead. Also maps of weather elements relevant to travel, health, sport, gardening and ...

XC Weather
Current weather observations and forecast. Providing near real time weather maps of wind strength and direction across the UK and Europe.

The UK Weather Information Site
Mission Statement (1) To provide readily-accessible observations and forecast data relevant to the British Isles for non-commercial use (2) To provide supplementary information of ...

 

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