The National Weather Service in America has issued a tsunami warning for the west coast of Canada and Alaska after an earthquake occurred in the Pacific Ocean.
The warning stretches from the northern tip of Vancouver Island up to Cape Suckling in Alaska.
More top news
It will be increasingly humid and thundery with highs of 30C or more today.
Holidaymakers in Tunisia are determined not to be beaten. But, as Neil Connery writes, it won't be easy to escape the shock of the massacre.
Drink lots of water, stay out of the sun during the middle of the day, and take particular care of vulnerable people.