A broad high pressure system is poised to move across southern Australia later this week, bringing with it a very dry air mass and gusty southerly winds that could significantly heighten fire danger ratings in the eastern regions of the country.

Weather forecaster Weatherzone state this dry air, combined with gusty winds, sets the stage for increased fire danger across broad regions, including inland NSW.

The most significant impacts are expected from Thursday to Saturday, with Thursday predicted to be the peak day, as winds reach their highest speeds of around 45-55 km/h.

With the reduction in moisture, this enhances the flammability of vegetation, making it easier for fires to ignite and spread rapidly.

Weatherzone warns if fires develop, the gusty winds could exacerbate the situation, carrying embers over considerable distances and resulting in spot fires that can ignite well ahead of the main blaze.