Ottawa has its first UV index advisory of 2013 with a "very high or extreme" UV index of 10 expected.

The sun can "quickly damage and burn unprotected skin" when it is this powerful, according to Ottawa Public Health.

Friday is also supposed to have its most humid day of the year and a humidex advisory is also in effect. CBC Ottawa climatologist Ian Black said the temperature could feel like 44 C with the humidity.

Public health officials advise babies less than one year of age should always be kept out of direct sunlight, especially during an advisory.

There are also 9 tips to limit sun exposure and avoid a burn:

  • Wear a hat with a wide brim to protect the face, ears and neck.
  • Wrap-around sunglasses that protect 100 per cent of UVA and UVB rays.
  • Wear tightly woven, loose fitting, full-length shirts and pants or skirts.
  • Seek shade and limit your time in the sun between 11 a.m. and 4 p.m.
  • Use a broad-spectrum sunscreen that blocks both UVA and UVB rays. Sunscreen and lip balm should have SPF of 30 or higher.
  • Sunscreen should be applied generously 20 minutes before going out in the sun and re-applied every two hours and after swimming, drying off or sweating.
  • Sunscreen can't block all the sun’s rays. It should be used in combination with shade, proper clothing and a hat.
  • Take care when you are around white sand and other bright surfaces as they reflect UV and can increase your UV exposure.
  • Place a canopy or umbrella over your baby’s stroller to provide protective shading.

There is also a severe thunderstorm watch in effect for the afternoon and evening in much of eastern Ontario and western Quebec.

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