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UV IndexFour-day forecast map | Lookup your index | Related links The ozone layer shields the Earth from harmful UV radiation. Ozone depletion, as well as seasonal and weather variations, cause different amounts of UV radiation to reach the Earth at any given time. Developed by the National Weather Service (NWS) and EPA, the UV Index predicts the next day's ultraviolet radiation levels on a 1-11+ scale, helping people determine appropriate sun-protective behaviors. 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. UV Index Forecast MapThe forecast map shows contour lines of predicted UV Index values during the solar noon hour. The map is created daily from National Weather Service forecast data. Click the buttons for Day 2, Day 3, or Day 4 to see the UV Index forecast for following days. You may notice a brief delay as each map loads. (To find the time of solar noon at your location, use the sunrise-sunset-solar noon calculator at the NOAA Web site.) Find Today's UV Index For Your City/TownThe UV Index is calculated daily. Enter your ZIP Code or city and state below for today's UV Index in your area. If a UV Alert is in effect for your area, that information is included with the UV Index. You can also look up UV Index using the following resources.
Related InformationTo report UV measurements for your school, please see the SunWise data entry page. The following UV Index archives and other information are available from National Weather Service:
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