This site: http://www.nswwaves.com.au/index.php seems to be designed for touch screens. On my desktop it prompts me to use Ctrl + scroll to zoom in. This did not work reliably for me using the mouse scroll wheel.
The advantage of it forecasting two days out; being able to dial up the hour and selecting any NSW beach is lost on me if it does not have the zoom [+] & [-] buttons on the bottom right corner (standard with Google maps).
Just had a look... interesting site! There are zoom arrows on the page on my PC but it takes a while for the page to refresh (prob slow internet speed here).