Walvis Bay Weather
Erongo
Namibia

19°C
Walvis Bay, Erongo, Namibia
Language: en
Updated20-Feb-2017 23:45 
 

WALVIS BAY UV FORECAST

Clear sky UV forecast
CURRENTTODAYSat 29 JulSun 30 JulMon 31 JulTue 1 AugThu 1 Jan
NOT AVAILABLE
5.7

5.8

6.0

6.0

5.9

n/a
NoneMediumMediumHighHighMediumNone

UV INDEX COLOUR SCALE

Ultraviolet (UV) radiation is a specific part of the sun's entire spectrum of wavelengths. UV radiation can be further sub-divided into three parts.

UV-C is characterized by wavelengths less than 280 nm. Although highly dangerous to plants and animals, this part of the UV spectrum is completely absorbed by stratospheric ozone and does not reach the earth's surface.

UV-B ranges in wavelengths between 280 and 320 nm. Ozone absorbs much of the shorter wavelength radiation, but this absorption weakens as 320 nm is approached. Plants and animals are particularly affected by this part of the UV spectrum. UV-B effects to humans are reddening of the skin (erythema) and reduction of vitamin-D synthesis in the short term, development of skin cancer, cataracts and suppression of the immune system in the long term.

The wavelengths of UV-A radiation range between 320 and 400 nm. Ozone absorbs very little of this part of the UV spectrum. 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.

The forecasts are based on assimilated SCIAMACHY data.

UV forecast courtesy of and Copyright © KNMI/ESA
http://www.temis.nl/ - Used with permission.