GribStream Blog
NOAA Ultraviolet Index forecasts are now on GribStream
GribStream now serves NOAA Ultraviolet Index forecast guidance for public-health, outdoor recreation, tourism, agriculture, and solar-exposure applications.
We added NOAA's Ultraviolet Index forecast to GribStream as uvi, making the gridded UVI forecast available through the same API workflow as the rest of the model catalog.
UVI is different from the usual atmospheric model fields. It is a public-health and environmental exposure product that estimates the expected intensity of sunburn-producing ultraviolet radiation. That makes it useful for applications where the user question is not temperature, rain, or wind, but whether outdoor exposure risk is elevated.
Why UVI is different
The UV Index is commonly communicated on a 1 to 11+ scale. EPA describes it as a daily forecast of expected ultraviolet radiation intensity from the sun, while NOAA's Climate Prediction Center publishes operational UVI forecast products and city guidance.
The forecast depends on more than clear-sky solar angle. Operational UVI guidance is affected by ozone, cloudiness, aerosols, elevation, and solar geometry. NOAA's CPC UVI page also notes recent updates that replaced climatological aerosol inputs with GEFS aerosol forecasts and increased temporal and spatial resolution of forecast inputs and outputs.
That makes gridded UVI useful for more than a static city bulletin. It can be queried by coordinate, joined with customer locations, and used in exposure-aware products.
Practical uses
UVI can support:
- sun-safety apps and public-health alerts
- outdoor labor planning
- schools, sports, parks, and recreation
- tourism and beach-condition products
- agriculture and livestock exposure workflows
- dermatology and wellness applications
- solar-exposure analytics for cities and venues
It can also be paired with GEFS Chem or future aerosol datasets when smoke, haze, or aerosol changes are part of the exposure story, and with GFS for broader weather context.