Great find.
You can zoom onto your location and double click it will bring up current wind speed and if you click on detailed forecast it will take you to Metoblue forecast for the next four days. Scroll down and if you are lucky you will see the nearest Web Cam with the last 24 hrs and previous history and if really lucky your sailing spot. So if you checked it out at say 1:00pm it would show shots on an hourly basis up to then.
It will be interesting to see how accurate it is compared to the other sites.
The good news is it shows there is going to be wind on Saturday for SA.