The Bureau of Meteorology is warning that an approaching cold front is "generating vigorous northwest to southwesterly winds".
A warning has been issued for a large region which will be affected on Friday evening and Saturday.
"Winds are expected to ease later on Saturday following the passage of the front," the Bureau stated.
Snow is also expected to fall in the region on Saturday morning.
The damaging winds have been forecast to average 60 to 70km/h, with peak gusts in excess of 90km/h.
Blizzards are likely for Alpine areas above 1600 metres.
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The NSW National Parks and Wildlife Service recommends that back country travel be postponed until conditions improve.
Locations which may be affected include Katoomba.
Mount Boyce AWS recorded a peak wind gust of 96km/h at 7.09pm on Thursday.
The State Emergency Service advises that people should:
- Move vehicles under cover or away from trees.
- Secure or put away loose items around your house, yard and balcony.
- Keep at least 8 metres away from fallen power lines or objects that may be energised, such as fences.
- Report fallen power lines to either Ausgrid (131 388), Endeavour Energy (131 003), Essential Energy (132 080) or Evoenergy (131 093) as shown on your power bill.
- For emergency help in floods and storms, ring your local SES Unit on 132 500.