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. Its purpose is to help people to effectively protect themselves from UV light, which causes sunburns, eye damage such as cataracts, skin aging, and skin cancer (see the section health effects of ultraviolet light). Public-health organizations recommend that people protect themselves (for example, by wearing sunscreen and a hat) when the UV index is 3 or higher; see the table below for complete recommendations.

Description

---

The index has a scale from 1, indicating a very weak sun, to 11, indicating an extremely strong sun. An index of 0 is theoretically possible, but unlikely to actually occur, as is an index greater than 11. The numbers are directly related to the amount of UV radiation reaching the surface of the earth, measured in W/m².

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. The prediction is made by a computer model that accounts for the effects of altitude and inclimate weather (clouds), which increase or decrease, respectively, the amount of UV radiation that will reach the surface. The calculations are weighted in favor of the UV wavelengths that human skin is most sensitive to. Providing the public with an easy-to-understand daily forecast of UV intensity is the main purpose of the UV index.

More on [ UV index ]

UV Index - Twitter Search

temperatuur: 3.4°C - UV index: 0.0 - luchtvochtigheid: 98 procent - wind: 6.1 km/h - regen: 5.4 mm
weerinbrunssum (Het weer in Brunssum) Fri, 25 Dec 2009 11:00:07 -0000
temperatuur: 3.4°C - UV index: 0.0 - luchtvochtigheid: 98 procent - wind: 6.1 km/h - regen: 5.4 mm
NYC 10011 UV FORECAST Fri 25 Dec 2009 *1.2*. UV Index Level: >1-2 low >3-5 med >5-7 high >8-11 very high. Water and snow doubles strength.
646 (New York) Fri, 25 Dec 2009 10:05:51 -0000
NYC 10011 UV FORECAST Fri 25 Dec 2009 *1.2*. UV Index Level: >1-2 low >3-5 med >5-7 high >8-11 very high. Water and snow doubles strength.
Wow! The UV index scale goes from 1-11 and today in Auckland it was 12 lol. That's NZ for you, always pushing the boundries weatherwise
Blairrr (Blair Cosford) Fri, 25 Dec 2009 09:30:13 -0000
Wow! The UV index scale goes from 1-11 and today in Auckland it was 12 lol. That's NZ for you, always pushing the boundries weatherwise
temperatuur: 1.2°C - UV index: 0.0 - luchtvochtigheid: 98 procent - wind: 3.9 km/h - regen: 5.4 mm
weerinbrunssum (Het weer in Brunssum) Fri, 25 Dec 2009 08:00:07 -0000
temperatuur: 1.2°C - UV index: 0.0 - luchtvochtigheid: 98 procent - wind: 3.9 km/h - regen: 5.4 mm
temperatuur: 3.8°C - UV index: 0.0 - luchtvochtigheid: 98 procent - wind: 4.6 km/h - regen: 4.4 mm
weerinbrunssum (Het weer in Brunssum) Fri, 25 Dec 2009 05:00:08 -0000
temperatuur: 3.8°C - UV index: 0.0 - luchtvochtigheid: 98 procent - wind: 4.6 km/h - regen: 4.4 mm
temperatuur: 2.8°C - UV index: 0.0 - luchtvochtigheid: 98 procent - wind: 0.0 km/h - regen: 3.3 mm
weerinbrunssum (Het weer in Brunssum) Fri, 25 Dec 2009 02:00:08 -0000
temperatuur: 2.8°C - UV index: 0.0 - luchtvochtigheid: 98 procent - wind: 0.0 km/h - regen: 3.3 mm

Subscribe to UV_Index RSS feed