It won't be nearly as intense as the March, 2008 heatwave, but much of eastern South Australia and western Victoria are about to experience four or five days of above 30 degrees.
The first of these days was yesterday, and from then on WeatherZone forecasts very warm northeasterlies will build, peaking temperatures mid to late week.
Adelaide can expect 30 or above for Sunday, Tuesday, Wednesday and Thursday.
The last two days of this sequence - immediately preceding a cold front - could reach the mid thirties.
Melbourne is likely to be somewhat cooler, but the northwestern Mallee and Wimmera will certainly climb near or above 30 most days.
Friday could also be very warm, but increasing cloud ahead of a cold front could limit temperatures, and even cause isolated storms.
By Saturday, the strong cold front will sweep cooler air and showers over the southeast, bringing an end to this bout of very warm weather.
The front will drop temperatures significantly, with highs over the weekend falling to only around 20 degrees in southern parts of both South Australia and Victoria.
An even stronger front is likely to hit southeastern Australia early next week which could drop temperatures to levels reminiscent of winter.
The front may even bring a dusting of early season snow to the Alps.
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