Well, it has been in the models for some time and I heard it from Nick last Sunday - it was going to be hot today. When you see 850hPa 24C isotherms over you the rule of thumb suggests about 40C at the surface!
I would think with such heating storms will develop in some regions of NSW but they will be high based.
What temperatures are people predicting for Sydney's west today? How about maximums in NSW?