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Get the Boydton, VA local weather forecast by the hour and the next 10 days. ... --UV Index. 5:09PM Sunset. 6 mph F 10 ... °F °C. Hourly 10 Days.
Environment Canada launched it as part of the weather forecast on May 27, 1992, making Canada the first country in the world to issue official predictions of UV levels for the next day. [15] [16] Many other countries followed suit with their own UV indices. Initially, the methods of calculating and reporting a UV index varied significantly from ...
The ozone AQI between 100 and 300 is computed by selecting the larger of the AQI calculated with a 1-hour ozone value and the AQI computed with the 8-hour ozone value. Eight-hour ozone averages do not define AQI values greater than 300; AQI values of 301 or greater are calculated with 1-hour ozone concentrations. 1-hour SO 2 values do not ...
Decreases in ozone amounts lead to increases in UV radiation. Calculations of UV irradiance based on relationships with total ozone and total irradiance suggest that UV irradiance has increased since the early 1980s by 6-14% at more than 10 sites distributed over mid- and high latitudes of both hemispheres.
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UV Outlook Index (1999–2003) – map-based product outlining contours of forecast UV index values around the region; Tides – summary of high and low tide times for the next two days for two coastal locations, and sunrise and sunset times for the current or following day; available only in coastal areas
Ozone in the ozone layer filters out sunlight wavelengths from about 200 nm UV rays to 315 nm, with ozone peak absorption at about 250 nm. [55] This ozone UV absorption is important to life, since it extends the absorption of UV by ordinary oxygen and nitrogen in air (which absorb all wavelengths < 200 nm) through the lower UV-C (200–280 nm ...
Of those 71 days, 40 were consecutive from July 2 to Aug. 10, the second most since 1980. Another stretch in 2011 of 20 days from Aug. 15 to Sept. 3, is sixth on the highest consecutive list for ...