User's Manual

Weather Conditions Measured/Calculated
Vantage Pro Manual Page 53
Vantage Pro can also display UV Index, an intensity measurement first defined
by Environment Canada and since been adopted by the World Meteorological
Organization. UV Index assigns a number between 0 and 16 to the current UV
intensity. The US EPA categorizes the Index values as shown below. The lower
the number, the lower the danger of sunburn. The Index value published by
the U.S. National Weather Service is a forecast of the next day’s noontime UV
intensity. The Index value displayed by the Vantage Pro is the result of a real-
time measurement.
TABLE A4: UV INDEX AND EXPOSURE CATEGORY
INDEX VALUES EXPOSURE CATEGORY
0 - 2 Minimal
3 - 4 Low
5 - 6 Moderate
7 - 9 High
10+ Very High
UV Dose and Sunburn - Use this plot to estimate the MED dose leading to sunburn. A person
with Type II (Environment Canada) skin type might choose 0.75 MED as the maximum for the
day; in contrast, a person with Type V (Environment Canada) Skin Type might consider 2.5
MEDs a reasonable dose for the day. NOTE: the Vantage Pro assumes a Fitzpatrick (Environ-
ment Canada) Skin Type of II.