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UV Alert Forecast
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This is an experimental product.
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The UV Alert product (see graphic below) is a joint
venture between the NWS and the EPA to provide
guidance for areas around the contiguous 48 states that are expected to experience well above normal
UV radiation levels during the mid-day period. If you are within a UV Alert region extra precautions
should be taken to protect oneself from the sun's UV radiation. The graphic below shows areas of 'near or below'
climatological levels of UV radiation for that particular day (white), or areas expected to be 'above normal'
UV conditions (yellow), and areas expected to be 'well above normal' conditions (red). The later areas are
considered to be within a UV Alert region.
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(Click on image to enlarge) |
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The UV Alert is based statistically upon a locale's daily climatological mean UV Index and its historical
variability for that day (standard deviation). Initially, for a locale to qualify to be within a UV Alert region
the UV Index must be "High" or 6 and above. If the UV Index is greater than the locale's climatological mean plus
one standard deviation it is considered to be 'above normal'. If the UV Index is greater than the locale's climatological mean plus
TWO standard deviations it is considered to be 'well above normal' and placed within the UV Alert region.
Click on the EPA logo to obtain additional
UV Index information via the EPA's SunWise web site
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