Bushfires still a risk in some NSW areas

LOWER temperatures, a change in wind direction and slightly higher humidity.

It sounds like the favourable weather combination fire fighters have been waiting for, but authorities warn a southerly change could carry some risk for fire-threatened communities.

Communities and fire fighters feared the worst on Wednesday with extreme fire conditions placing pressure on major bushfires burning in the Blue Mountains and Southern Highlands.

However, Rural Fire Service Commissioner Shane Fitzsimmons said the risk had been averted.

A southerly change swept through the fire grounds on Wednesday night and all bushfires initially subject to emergency alert warnings were downgraded to watch and act.

The southerly winds will contribute to a drop in temperatures, but the winds will be between 45-50km/h on Thursday.

There will be gusts up to 90km/h across the mountain ranges and humidity will be between 10-15 per cent, RFS says.

"We are expecting those winds to be very strong and particularly dry," Mr Fitzsimmons said late on Wednesday.

"While the temperatures will moderate down into the 20s, a welcome relief to what we saw (Wednesday), they still will be strong.

"It's going to be particularly problematic for firefighters because there is no moisture in this change and it is going to be very dry air."

Mr Fitzsimmons said the wind change had a potential to present new challenges for Yarramundi Valley and Grose Valley communities as well as for the northern end of the Springwood fire.

Overnight, fire fighters in the Blue Mountains were carrying out 15-20km of back burning.

More than 20 schools in at risk areas will remain closed on Thursday.

TAFE campuses at Katoomba and Wentworth Falls in the Blue Mountains will also be closed.

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