Doug,
http://www.bom.gov.au
http://www.bom.gov.au/nsw/forecasts/sydney.shtml
Satellite image
http://www.bom.gov.au/australia/satellite/
Sydney rain radar
http://www.bom.gov.au/products/IDR713.loop.shtml#skip
Nearest weather station to Blackheath is Mt Boyce if you want live wind and temps - it is about the same altitude and the wind is what you will experience at Mt Blackheath or Hargraves (I fly a paraglider there sometimes)
http://www.bom.gov.au/products/IDN60...01.94743.shtml
Katoomba forecast
http://www.bom.gov.au/nsw/forecasts/...blelands.shtml
Katoomba webcam gives a look at the sky (seems to be offline today)
http://www.scenicworld.com.au/explor...-look/web-cam/
Satellite pic tells the story cloud-wise and you might want to look at the synoptic chart too. It's not looking good BTW, I'll be very surprised if the cloud clears up on Sunday.