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UV-Index
UV Index - Be SunWise
What is the UV Index?
Some exposure to sunlight can be enjoyable; however, too much could be dangerous. Overexposure to the sun's ultraviolet (UV) radiation can cause immediate effects such as sunburn and long-term problems such as skin cancer and cataracts. The UV Index, which was developed by the National Weather Service and the U.S. Environmental Protection Agency (EPA), provides important information to help you plan your outdoor activities to prevent overexposure to the sun's rays.
The UV Index provides an indicator of the expected risk of overexposure to the sun. The Index measures UV intensity levels on a scale of 1 to 11+, where low indicates a minimal risk of overexposure and 11+ means an extreme risk. The UV Index takes into account clouds and other local conditions that affect the amount of UV radiation reaching the ground.
By taking a few simple precautions, you can greatly reduce your risk of sun-related illnesses. To Be SunWise, consider the following steps:
- Limit your time in the sun between 10 a.m. and 4 p.m.
- Whenever possible, seek shade.
- Use a broad spectrum sunscreen with an SPF of at least 15.
- Wear a wide-brimmed hat and if possible, tightly woven, full-length clothing.
- Wear UV-protective sunglasses.
- Watch the daily UV Index.
While you should always take precautions against overexposure to the sun, please take special care to adopt the safeguards when the UV Index indicates levels of moderate or above.
Sources of data:
UV Index forecast from NOAA/EPA
UV Index maps from WeatherUnderground
Actual UV index readings/graph data from UV sensor on Davis Vantage Pro Plus weather station
Thanks to Ken at CapitolaWeather.net for the text and inspiration for this page.
Glendora Random Weather Fact
HUMIDEX
Definition Humidex - Over the years, several measures have been proposed to relate various combinations of temperature and humidity into a single number to approximate what hot, humid weather feels like to the average person. Of these, humidex is the one most familiar to Canadians. Humidex was introduced into Canada in 1965. The index is a summer analogue of the wind chill factor in that it is an equivalent air temperature. Air of a given temperature and humidity is equated in comfort to air of a higher temperature that has a negligible moisture content. Comfort is quite subjective and largely dependent on the age and health of the individual. Weather conditions causing prickly heat in an infant may result in heat cramps in a teenager, heat exhaustion in a middle-aged and heat stroke in a senior. Humidex is also limited as an overall hot-weather comfort index because it does not consider other factors such as pressure, wind speed, precipitation, sunshine or pollen.
