UV Alert Forecast for the USA

UV_Alert_USA

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.

MORE INFO ON
http://www.cpc.ncep.noaa.gov/products/stratosphere/uv_index/uv_alert.shtml

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