Once more in the top right corner select 'Detailed 3-Hourly Forecast'. To view this output click on 'See text views for location' in the top right hand corner and you will be presented with a weather page for your selected location. To see how the values of UV change during the day the UV Index values are presented in our Detailed 3-Hourly Forecast tabular output. Note that the viewer will open with wind speed and direction as a default setting. The UV index can be selected from the left hand menu once you are in the viewer. There are also maps of UV Index inside our forecast viewer ' MetEye'. Calculated on a next-day basis for dozens of cities across the United States, the UV Index takes into account clouds and other local conditions that affect the amount of UV radiation reaching the ground in different parts of the country.This example shows where you can find the UV information: The Index predicts UV intensity levels on a scale of 1 to 11+, where 1 indicates a minimal risk of overexposure and 11+ means a very high risk. The UV Index provides a daily forecast of the expected risk of overexposure to the sun. The UV Index provides important information to help you plan your outdoor activities to prevent overexposure to the sun's rays. Overexposure to the sun's UV radiation can cause immediate effects such as sunburn and long-term problems such as skin cancer and cataracts. Some exposure to sunlight can be enjoyable however, too much could be dangerous. The Web site will also display a UV Alert when the level of solar UV radiation is predicted to be unusually high, and consequently the risk of overexposure is greater. Several fact sheets explain the UV Index and steps you can take to minimize the risks from overexposure to the sun's rays.

The UV Index predicts the ultraviolet radiation levels on a 1-11+ scale, helping people determine appropriate sun-protective behaviors. Ozone depletion, as well as seasonal and weather variations, cause different amounts of UV radiation to reach the Earth at any given time. The ozone layer shields the Earth from harmful ultraviolet (UV) radiation.

Uv index