Ultraviolet

What it shows

The ultraviolet index now, the measure that sunburn follows (temperature does not). The readout also gives the clear-sky UV index; the gap between the two is the protection the clouds are giving.

Where the data comes from

Derived from NOAA GFS (public domain): clear-sky UV from sun elevation and GFS total ozone, cut by GFS cloud through the solar radiation deficit; 2° grid, 24 h ago to 48 h ahead.

Reading the map

The colour changes at the WHO bands: protection needed from 3, high from 6, very high from 8 (unprotected skin burns in under 20 minutes), extreme at 11 and above.

Units UV index (no unit).

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Other layers in weather

• Wind
• Temperature
• Rain radar
• Pressure
• Humidity
• Air quality
• Solar power
• Sea state
• River flow