VANCOUVER—High temperatures, low humidity and an increase in winds are making wildfire conditions challenging in southern British Columbia, says the provincial deputy forests minister. Rick Manwaring said there’s no rain in sight, temperatures are rising and gusty winds are expected across several parts of southern B.C. “With the heat comes lower relative humidity values and increased activity on these fires,” he told a news conference Thursday. Humidity is one of the biggest factors in wildfire behaviour and at this time of the year, crews are looking for what they call “recovery,” Manwaring said. “So, as the sun goes down in the evening and nighttime comes, the relative humidity begins to climb on the land base, and wildfire activity drops,” he said. Fire personnel usually take advantage of cooler temperatures at night to put in guards and take advantage of the decreased blaze behaviour, he said. But this year, they haven’t …