Hi Sam, the pic shows that we have stabilised the lagoon entrance configuration and the dunal areas. But I don't think it explains our change in wind strengths on the northside since then.
I wonder if its something to do with the increased amount of building and concrete in sydney somehow forming a heat sink (the hot air stays in the concrete instead of rising) that reduces the seabreeze on the north side and has subsequently increased it on the edges (central coast and Wanda) as it funnels around the city ??
Any other hypotheses ??
Rob
Another point is the water/land temperature
I believe a seabreeze needs a temperature differential between water and land temperatures, so as the land heats up during the morning, the heated air rises and sucks the cooler air in from the sea.
Water temperatures are warmer now than 20-30 years ago, across all seasons, and the "heat island" effect of development means overnight temps in summer are warmer.
Therefore, if the land temperature warms during the day from a higher base temperature the previously, then the air doesn't rise as fast, plus if the water temperature is also higher as well, the water/land temperature differential is much less, so a reduction in sea breeze strength results.
Just a thought.
Cheers!
Both very good Points - something I have been arguing for a long time now.
You will also notice that the direction of the NE has changed considerably since the 80,s when it was more East.
At palmy we used to be able to sail from south of the golf course to the western side of BJ in one tack. Also at the lake you could sail at the tin shed and you course was along the sand bar.
Same at the bay in a NE you would sail paralell to the runway
That's why migrating to smaller regional cities is the only way to go.
No air-flow problems down here. 
Great pic though. I can see my old house.
No doubt about it the sea breeze in and around Sydney is definately not what it use to be..... You know what to do to solve the problem???????? Hook up with a good WA girl and move to WA !! We have just had cracker of a season!! More wind than you would poke a hair dryer at. 
