Birubi Beachs' closest forecast would be Newcastle/Mid North NSW, although remember Birubi is a good distance from here so this forecast wont be super accurate as it wont take into account Birubis unique coastal features affecting it's weather. Link below.
www.seabreeze.com.au/graphs/nsw4.asp
Nobbys is a fair way from here and anything with west tends to funnel in and along the sand dune corridor along Stockton beach.
You can check the Coastal_watch cam for Shoal Bay and Hawks Nest... they have a wind reading on the left hand side as you scroll down.http://www.coastalwatch.com/camera/cameras_large.aspx?cam=2750&state=NSW&t=10:50:18%20AM&camName=Shoal%20Bay
I have kept a close watch on it and does not always match Nobbys which would suggest a different weather station up in the Bay/Hawks Nest region... just not sure where or how ?
You also check here:
www.bom.gov.au/products/IDN60800.shtml
Look under Hunter and then Nelson Bay.
It only gets updated a few times a day as its done by the volunteer sea rescue at Fly Point... Being older blokes, they like to do things the old fashioned way and take actual readings as opposed to relying on new fandangle machines and computers !
You can also ring them direct and ask them what the reading is and they will normally tell you over the phone.
Rough rule of thumb... if its got west in it.. it's most likely 5 - 10 knots stronger at Birubi then at Nobbys based purely on geographical nature of surrounding area.
Kev
weatherzone.com.au has readings from williamtown RAAF base, that can be a good indication if it happening at the bay..
argh k .. thought about mabey this satday arvo ... just didnt want to drive 2hrs up thier for no wind