A bushfire has erupted at Herdsman Lake, a popular wetland located about six kilometers from the Perth central business district, despite the city's cool autumn weather. The fire, reported around 10:30 AM on Monday, is advancing in an easterly direction through difficult-to-access bushland. The Department of Fire and Emergency Services (DFES) has issued a watch and act alert for residents in the suburbs of Glendalough, Osborne Park, and Wembley due to the potential threat to lives and homes. The primary concern is the embers that may be carried into residential areas surrounding the lake. Today's temperature in Perth is forecasted to reach 23 degrees Celsius, with varying fire danger ratings across the city.