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Conclusions

The consistency of differences between the UV Index forecasts and observations from two surface UV networks implies the viability of the UV Index forecasts at other locals. This was shown were comparisons against observations made by one instrument had a consistent bias, but comparisons against another instrument in the same local had nearly zero bias. Thus, observations from sites with consistently large biases from the UV Index forecasts would be under suspect.

The UV Index forecasts can also be use to detect unexplained changes in the observation record during the course of the time period. These attributes allow a network data manager or a single observer to use the UV Index forecasts as a first indicator of problems with an instrument.

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