Fire danger is about to spike in South Australia, Tasmania, Victoria and New South Wales and about to drop in Western Australia as an area of hot, dry wind heads east. Ratings have been nudging the Extreme category in WA on the weekend and are about to do the same in parts of eastern WA and SA on Monday and parts of eastern SA, Victoria and NSW on Tuesday. A wave of hot, dry northerly winds is sweeping east across the country, blowing across land which has dried out significantly during the past month or so. At about 11:30am on Sunday, Norseman in the southern Goldfields of WA was 39 degrees, humidity 10 percent and northerlies were gusting 40-50 km/h, taking the fire danger rating beyond Severe and into Extreme. In the next few days, areas with the best chance for Extreme fire danger ratings are the WA Eucla (where it should reach Catastrophic), SA West Coast, pastorals and Riverland, Victorian Mallee and Wimmera and NSW Riverina. Meanwhile, the Norseman area will pick up some rain (potentially more than 20mm) during Sunday night and Monday, causing temperature to drop to the low twenties and for fire danger to plummet. Bush fires which have been burning near Eyre and Eucla will have to wait until later on Monday to experience a similar cooling, dampening change. The cooler change is then set to move through SA, Tasmania and Victoria during Tuesday and southern NSW during Wednesday but this will be a relatively dry change compared to further west.