Ultraviolet Index Forecasts Issued by the National Weather Service

Craig S. Long
Search for other papers by Craig S. Long in
Current site
Google Scholar
PubMed
Close
,
Alvin J. Miller
Search for other papers by Alvin J. Miller in
Current site
Google Scholar
PubMed
Close
,
Hai-Tien Lee
Search for other papers by Hai-Tien Lee in
Current site
Google Scholar
PubMed
Close
,
Jeannette D. Wild
Search for other papers by Jeannette D. Wild in
Current site
Google Scholar
PubMed
Close
,
Richard C. Przywarty
Search for other papers by Richard C. Przywarty in
Current site
Google Scholar
PubMed
Close
, and
Drusilla Hufford
Search for other papers by Drusilla Hufford in
Current site
Google Scholar
PubMed
Close
Full access

The National Weather Service (NWS), in collaboration with the Environmental Protection Agency (EPA), now issues an Ultraviolet (UV) index forecast. The UV index (UVI) is a mechanism by which the American public is forewarned of the next day's noontime intensity of UV radiation at locations within the United States. The EPA's role in this effort is to alert the public of the dangerous health effects of overexposure to, and the accumulative effects of, UV radiation. The EPA also provides ground-level monitoring data for use in ongoing verification of the UVI. The NWS estimates the UVI using existing atmospheric measurements, forecasts, and an advanced radiative transfer model. This paper discusses the justification for a forecasted index, the nature of UV radiation, the methodology of producing the UVI, and results from verifying the UVI. Since the UVI is an evolving product, a short discussion of necessary improvements and/or refinements is included at the end of this article.

*NOAA/NWS/NCEP/Climate Prediction Center, Washington, D.C.

+Research and Data Systems Corporation, Greenbelt, Maryland.

#NOAA/NWS/Office of Meteorology, Washington, D.C.

@EPA/OAR/Office of Atmospheric Programs, Washington, D.C.

Corresponding author address: Craig S. Long, Stratospheric Analysis Group, National Centers for Environmental Prediction, W/NP53, World Weather Building, Room 808, Washington, DC 20233. E-mail: long@upair.wwb.noaa.gov

The National Weather Service (NWS), in collaboration with the Environmental Protection Agency (EPA), now issues an Ultraviolet (UV) index forecast. The UV index (UVI) is a mechanism by which the American public is forewarned of the next day's noontime intensity of UV radiation at locations within the United States. The EPA's role in this effort is to alert the public of the dangerous health effects of overexposure to, and the accumulative effects of, UV radiation. The EPA also provides ground-level monitoring data for use in ongoing verification of the UVI. The NWS estimates the UVI using existing atmospheric measurements, forecasts, and an advanced radiative transfer model. This paper discusses the justification for a forecasted index, the nature of UV radiation, the methodology of producing the UVI, and results from verifying the UVI. Since the UVI is an evolving product, a short discussion of necessary improvements and/or refinements is included at the end of this article.

*NOAA/NWS/NCEP/Climate Prediction Center, Washington, D.C.

+Research and Data Systems Corporation, Greenbelt, Maryland.

#NOAA/NWS/Office of Meteorology, Washington, D.C.

@EPA/OAR/Office of Atmospheric Programs, Washington, D.C.

Corresponding author address: Craig S. Long, Stratospheric Analysis Group, National Centers for Environmental Prediction, W/NP53, World Weather Building, Room 808, Washington, DC 20233. E-mail: long@upair.wwb.noaa.gov
Save