Firies stay vigilant as NSW sweats again A cool change is bringing relief on another sweltering spring day in NSW but firefighters are still feeling the heat. It was 35C in Sydney at 1pm (AEDT) on Sunday and the temperature was rising toward the forecast of 36C. Williamtown in Newcastle was one of the hottest places in the state, with 35C recorded before noon. A change sweeping through the state is expected to drop temperatures by as much as 10 degrees when it reaches Wollongong by 6pm and Sydney by 9pm. The Bureau of Meteorology says the strong cold front will bring damaging winds of around 50km/h with peak gusts of 90km/h. The NSW Rural Fire Service has banned the lighting of fires for Sunday in large parts of NSW, including greater Sydney. Deputy Commissioner Rob Rogers told AAP firies were working on several fires across the state. These included a blaze at Londonderry in western Sydney that had been threatening semi-rural properties but was being brought under control. Mr Rogers said the winds could complicate matters where fires were active. "Once the change is through and assuming there's no major fires going on, we will be quite thankful," he said. Teams of firefighters with helicopters were on stand-by in case of dry lightning strikes, Mr Rogers said. All walking tracks and fire trails in Sydney metropolitan national parks are closed for the day. The bureau has also issued a severe weather warning for damaging winds for people in western and southeastern NSW. At 2pm there were two fires burning out of control in NSW. An emergency warning was issued for people in four streets at Fingal Bay, north of Newcastle, where more than 30 firefighters were working. Residents were advised to seek shelter. The second warning was for residents of Edison Parade and Oakes Road at Winston Hills in Sydney's northwest, where a fire was burning out of control in Palestine Park. More than 15 firefighters, supported by aircraft, were on the scene. Residents were advised to follow their bushfire plans.