thumb|Fire damage visible in background of Rattlesnake Island
On August 16, 2003, at about 4 a.m. local time, a wildfire started via lightning strike near Rattlesnake Island in Okanagan Mountain Provincial Park, British Columbia, Canada. The wildfire was fuelled by a constant wind and the driest summer on record up to that time. Within a few days it grew into a firestorm.
The fire spread northward and eastward, initially threatening a small number of lakeshore homes, but quickly became an interface zone fire and forced the evacuation of 27,000 residents, consuming 239 homes. The final size of the firestorm was over 250 square kilometres ().