The BC Wildfire Service says of the 540 fires recorded since April in British Columbia, more than one quarter have been sparked in the last week.
The service's website shows many of the 151 fires that have flared in the last seven days were caused by lightning, and almost three dozen are listed as out of control.
Those include the 14-square kilometre wildfire in the south Okanagan that has already destroyed one home and forced people to leave more than 300 properties south of Penticton.
Cooler temperatures and light winds helped a team of 86 firefighters make what the wildfire service says is "great progress" building a guard on the flank of the fire closest to homes.
Two other lightning-caused fires continue to create problems.
Ten properties were ordered evacuated Wednesday night in southeastern B.C. as a wildfire near Canal Flats chewed through four square kilometres of bush, and homes remain threatened by a small but aggressive blaze close to the southern Interior community of Beaverdell.
The wildfire service says "good progress" was made Wednesday on the flanks of that 18-hectare fire closest to homes and Highway 33.
Near Penticton, evacuation alerts remain posted by the Regional District of Okanagan-Similkameen, affecting about 3,700 properties on the east and west sides of the so-called Christie Mountain fire, currently the largest in B.C.
A specialized incident management team is being assembled to handle the blaze and the wildfire service says members from across B.C. will begin arriving in Penticton over the next day.
An air quality statement warning of smoky skies over the south Okanagan, Boundary and Whistler regions has been issued by Environment Canada.
It advises asthma sufferers or anyone with a chronic condition to stop or reduce activity levels if wildfire smoke makes breathing uncomfortable.
The weather office is calling for a 30 per cent chance of showers in the Penticton region, climbing to 70 per cent over the next 24 hours.
But Friday's forecast also includes the risk of more thunderstorms and temperatures nudging into the low 30s, with an added risk of strong, gusty winds.
