Above is a 6-day significant weather graph for Brisbane using FV3 data. The scale on the vertical axis is somewhat arbitrary but in basic terms, the upper end of the scale represents the most extreme values. The blue and red cool and warm lines are only valid for 1pm during the daytimes so they won't necessarily reflect what the min temps are like.
Basically looking at very unseasonably warm for Thursday with very elevated fire danger and gusty winds increasing ahead of the first front then continuing gusty for a number of days as further fronts pass by, then getting colder.
May well also be dust raised over the interior.
Forecasts for Thursday have had the chance of a thunderstorm in southern parts of the Downs although with the huge inversion aloft, convection may struggle to become overly tall. Some showers possible there though.
Snowfall on the southern Downs this weekend still looks like a risky gamble but would be good if it paid off for snowchasers (not the best odds but a high reward). But even if any snowfall does manage to occur on the off chance, it wouldn't do anything for the drought conditions there.
Meanwhile snowfall potential still looks pretty good for the northern NSW tablelands particularly in places like Guyra.