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Topic: UV index


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In the News (Mon 19 Aug 19)

  
  Surf Cam Texas - UV Index: What is it?
The UV Index is a forecast of the amount of skin damaging UV radiation expected to reach the earth's surface at the time when the sun is highest in the sky (solar noon).
The amount of UV radiation reaching the surface is primarily related to the elevation of the sun in the sky, the amount of ozone in the stratosphere, and the amount of clouds present.
UV radiation is greatest when the sun is highest in the sky and rapidly decreases as the sun approaches the horizon.
www.netsurfing.com /surfcam/uv_index.html   (446 words)

  
 Canadian Weather Almanac: The UV Index   (Site not responding. Last check: 2007-10-08)
UV rays have been in the news in recent years because of their connection to the ozone layer, an invisible shield of gases in the atmosphere that protects life on Earth from the most harmful forms of radiation.
UV rays are strongest at noon, and less strong in the early morning or late afternoon.
UV rays are strongest in the summer, less strong in the spring and fall, and weakest during the winter.
members.tripod.com /~MitchellBrown/almanac/uv_index.html   (492 words)

  
 UV Index   (Site not responding. Last check: 2007-10-08)
The greatest amount of UV is received in the late spring and early summers much less is received in the late fall and early winter.
UV radiation exposure is implicated in the formation of non-melanoma and melanoma cancers.
UV exposure is one of the risk factors in the development of cataracts.
www.swamphen.net /wx/tutorials/uv.htm   (3513 words)

  
 Ultraviolet Index Forcast: Eyewitness News Storm Team Weather
The higher the UV Index the greater the threat is to one's skin and eye's.
The UV Index is a forecast of the probable intensity of skin damaging ultraviolet radiation reaching the surface during the solar noon hour (11:30-12:30 local standard time or 12:30-13:30 local daylight time).
UV-A radiation is needed by humans for the synthesis of vitamin-D; however, too much UV-A causes photoaging (toughening of the skin), suppression of the immune system and, to a lesser degree, reddening of the skin, and cataract formation.
www.wchstv.com /newsroom/wx/uvindex.shtml   (544 words)

  
 UV Links   (Site not responding. Last check: 2007-10-08)
UV Index programs have been used since the late 1980s as an effective way to educate and warn the public about current UV levels.
The UV index for wide parts of Central and Eastern Europe is provided daily by the The Deutscher Wetterdienst (the German Meteorological Service).
UV Index forecasts from the National Meteorological Institute of Spain.
www.srrb.noaa.gov /UV/lindex.html   (674 words)

  
 WHO: Global solar UV index   (Site not responding. Last check: 2007-10-08)
Acute effects of UV radiation on the eye include photokeratitis, an inflammation of the cornea and iris, and photoconjunctivitis, an inflammation of the conjunctiva, the membrane that lines the inside of the eyelids.
Long-term effects of UV radiation exposure of the eye may include the development of pterygium (white or creamy opaque growth attached to the cornea), and squamous cell cancer of the conjunctiva.
The immune system is vulnerable to modification by environmental agents such as UV radiation, which appears to diminish the effectiveness of the immune system by changing the activity and distribution of the cells responsible for triggering immune responses.
www.who.int /mediacentre/factsheets/who271/en   (1542 words)

  
 UV Index - Used to Measure the Sun's Ultraviolet (UV) Radiation
The UV Index is a device that is used to measure the amount of the Sun’s ultraviolet (UV) radiation that will reach the Earth’s surface during the peak hour of sunlight (1:00 PM local daylight savings time).
The UV Index is now used in many other countries around the world, where UV Radiation is considered to be a risk.
The Index is a number rating from 0 to 10+ which gives a measure of the amount of UV Radiation that will reach the Earth’s surface during the peak hour of sunlight, when there is the greatest amount of UV rays entering the Earth’s atmosphere.
www.sun-togs.com /page.uv_index   (610 words)

  
 UV index - Wikipedia, the free encyclopedia
The UV index is an international standard measurement of how strong the ultraviolet (UV) radiation from the sun is at a particular place on a particular day.
The UV index announced in weather forecasts is a prediction of how strong the actual UV intensity will be at the sun's highest point in the day, which typically occurs during the four-hour period surrounding solar noon.
In 1992, three scientists from Environment Canada developed the UV index, and made Canada the first country in the world to broadcast forecasts of the predicted daily UV levels for the next day.
en.wikipedia.org /wiki/UV_index   (836 words)

  
 UV Index Newsletter 21
UV Index was defined to be the scaled integral of spectral irradiances between 290 and 400 nm weighted by the CIE erythemal action spectrum [McKinlay and Diffey, 1987].
The UV Index value that the RTM or empirical method determines is the maximum amount of UV radiation to be expected under “clear sky” conditions.
Noontime UV Index values were generated from the total ozone forecast fields like that shown in Figure 5a but for all hours of March 21, 2003.
www.atmosp.physics.utoronto.ca /SPARC/News21/21_Long.html   (3199 words)

  
 FCIC: The Sun, UV, and You: A Guide to the UV Index and Sun-Safe Behavior
UV intensity increases with altitude because there is less atmosphere to absorb the damaging rays.
To compute the UV Index forecast, the model first calculates a UV dose rate, or amount of UV radiation to which a person will be exposed at the next day's solar noon (when the sun is highest in the sky) under "clear sky" (no clouds) conditions.
The UV forecasts for selected locations are provided daily on a 0-10+ scale, where 0 indicates a minimal likely level of exposure to UV rays and 10+ means a very high level of exposure.
www.pueblo.gsa.gov /cic_text/health/sun_uv/sun-uv-you.htm   (2855 words)

  
 UV   (Site not responding. Last check: 2007-10-08)
The UV Index is a daily forecast of the UV radiation levels people might experience.
A UV Index reading of 5 to 6 means moderate risk of harm from unprotected sun exposure.
A UV Index reading of 7 to 9 means high risk of harm from unprotected sun exposure.
www.nsc.org /ehc/sunwise/UV.htm   (767 words)

  
 UV Index   (Site not responding. Last check: 2007-10-08)
The UV Index indicates the strength of the UV radiation (Click here to see the definition of the UV Index).
To reduce the harm from UV radiation, the most important thing is to minimize direct exposure of the skin and the eyes to sunlight.
On days when the UV Index is high, you should avoid staying outdoors for prolonged periods.
www.weather.gov.hk /wxinfo/uvindex/english/euvtoday.htm   (167 words)

  
 USATODAY.com   (Site not responding. Last check: 2007-10-08)
The UV index - a measure of sunburn danger - was given a makeover in 2004..
Although categories on the new Global UV index have been reorganized and relabeled, a UV index report of 6 represents the same intensity of radiation on both the old and new scales, even if 6 is called "Moderate" on the old scale and "High" on the new scale.
A UV Index reading of 3 to 5 means moderate risk of harm from unprotected sun exposure.
www.usatoday.com /weather/wuv2.htm   (642 words)

  
 TEMIS -- Clear sky UV index -- forecast and archive   (Site not responding. Last check: 2007-10-08)
The clear-sky UV index is based on the CIE action spectrum for the susceptibility of the caucasian skin to sunburn (erythema).
The UV index is the effective UV irradiance (1 unit equals 25 mW/m2) reaching the Earth's surface.
The UV index is given for local solar noon: the moment when the Sun is highest in the sky (i.e.
www.temis.nl /uvradiation/UVindex.html   (249 words)

  
 EPA SunWise: UV Index
EPA will issue a UV Alert when the level of solar UV radiation is predicted to be unusually high, and consequently the risk of overexposure is greater.
The forecast map shows contour lines of predicted UV Index values during the solar noon hour.
If a UV Alert is in effect for your area, that information is included with the UV Index.
www.epa.gov /sunwise/uvindex.html   (309 words)

  
 UV & Ozone - NIWA Science   (Site not responding. Last check: 2007-10-08)
The UV index is a standard measurement of erythemal (sun-burn causing) UV intensity that gives a more objective measure than the old “time to burn” (which cannot account for skin tone).
The scale is open-ended, but a UV index of greater than 10 is extreme and a UV index of less than 1 is low.
The aim of the UV Atlas project is to produce maps and time series of parameters describing the UV radiation environment over New Zealand since 1960.
www.niwascience.co.nz /services/uvozone   (692 words)

  
 UV Index Forecast
Ultraviolet radiation (UV) comes from the Sun and on reaching the Earth after passing through the atmosphere it may have been modified by a number of factors(please refer to here for details).
The amount of UV received is also influenced by the nature of ground surface.
For these reasons, apart from referring to the UV Index predicted by the Observatory, members of the public are advised to note the sky conditions, their altitude, and their whereabouts regarding the nature of ground surface, and take the appropriate protective measures against UV.
www.hko.gov.hk /wxinfo/uvfcst/uvfcst.htm   (301 words)

  
 UV Index
The UV Index provides a daily forecast of the expected risk of overexposure to the sun.
The Index predicts UV intensity levels on a scale of 0 to 10+, where 0 indicates a minimal risk of overexposure and 10+ means a very high risk
The UV index is provided daily by the The Deutscher Wetterdienst and Bundesamt für Strahlenschutz.
www.theozonehole.com /uvindex.htm   (700 words)

  
 EPA SunWise: What is the UV Index?
The UV Index, which was developed by the National Weather Service and the U.S. Environmental Protection Agency (EPA), provides important information to help you plan your outdoor activities to prevent overexposure to the sun’s rays.
The Index predicts UV intensity levels on a scale of 1 to 11+, where 1 indicates a low risk of overexposure and 11+ signifies an extreme risk.
EPA issues a UV Alert when the level of solar UV radiation reaching your local area is predicted to be unusually intense for the time of year.
www.epa.gov /sunwise/uvwhat.html   (626 words)

  
 UV Exposure Categories - Skin Cancer Health Guide
The Index is a next-day forecast that estimates the amount of ultraviolet radiation that will reach the earth's surface -- providing important information to help you prevent overexposure to the sun's rays.
An index reading of 0 to 2 means minimal danger from the sun's UV rays for the average person.
An index reading of 7 to 9 means you may be at high risk of harm from unprotected exposure to the sun -- many people can burn in under 15 minutes.
www.umm.edu /skincancer/category.htm   (292 words)

  
 UV Index (UVI) map: World, US, Australia, New Zealand. UV intensity. SafeSun UV meter.   (Site not responding. Last check: 2007-10-08)
The NOAA/EPA UV Index is computed using the forecasted ozone data, a radiative transfer model, forecasted cloud amounts and the elevation of the forecast cities.
A radiative transfer model is used to determine the UV irradiances from 290 to 400 nm, using the time of day (solar noon), day of year, and latitude.
Disclaimer: The UV Index levels indicated in the maps should be regarded as estimates and are subject to further revision upon a more detailed analysis.
www.safesun.com /uv_map.html   (574 words)

  
 WHO | UV Index
A marked increase in the incidence of skin cancer in fair-skinned populations worldwide is strongly associated with excessive UV radiation exposure from the sun and possibly artificial sources such as sunbeds.
The UV Index is an important vehicle to raise public awareness of the risks of excessive exposure to UV radiation, and to alert people about the need to adopt protective measures.
As part of an international effort, the UV index was developed by WHO, the United Nations Environment Programme, and the World Meteorological Organization.
www.who.int /uv/intersunprogramme/activities/uv_index/en   (248 words)

  
 AccuHelp - The AccuWeather FAQ and Help Site   (Site not responding. Last check: 2007-10-08)
Ultraviolet (UV) Radiation is part of the invisible spectrum of light that reaches the Earth from the Sun.
National and regional UV Index maps are updated every hour using vibrantly colored bands, with an easy-to understand 5-category scale, ranging from 0 (minimum levels) to 10 or more (very high levels).
The stronger the sun, the higher the UV Index number, indicating a greater need for eye and skin protection.
www.accuweather.com /iwxpage/adc/help/pr_uv.htm   (430 words)

  
 Ultra Violet Index Forecast for Victoria
The SunSmart UV Alert indicates when the UV Index forecast is 3 or above, a level that can damage your skin and lead to skin cancer.
The maximum UV Index is that expected with clear and sunny conditions.
For a colour graph of the UV Index during the day, in clear sky conditions, please click the location name in the left hand column.
www.bom.gov.au /products/IDY05216.shtml   (280 words)

  
 Met Office: Europe solar UV index
The symbols on the map show the solar UV index for a number of locations in Europe.
A more detailed UV index forecast for the UK is also available by clicking on the UK.
The strength of the sun's ultraviolet (UV) radiation is expressed as a 'Solar UV Index', a system developed by the World Health Organization.
www.met-office.gov.uk /weather/uv/uv_eu.html   (151 words)

  
 UV Index definition
Changes in UV radiation can be expressed in a variety of ways, and the question of which particular measure is most relevant to a given biological effect is often complex and difficult to resolve.
UV intensity is also described in terms of ranges running from low values (0-2) to medium (3-5), high (6-7), very high (8-10) and extreme (11+).
The UV-Index Poster by Francis Massen and Nico Harpes from Meteorological Station of the Lycée Classique de Diekirch, Luxembourg, explains the relationship between UV index and MED (minimal erythemal dose).
woudc.ec.gc.ca /e/ozone/uv_index_definition.htm   (556 words)

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