Kelowna NewsHeat warnings issued again in B.C. Southern InteriorHeat warnings returnPhoto: Carina Van de Velde The Penticton Channel. Heat warnings have been re-issued in several parts of the B.C. “Daytime highs are expected to be in the mid to high 30s with overnight lows in the mid to high teens,” said the agency’s alert. Meanwhile, the wildfire danger rating in the Southern Interior ranges from high to extreme.