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Mr Milk said..
Where in Jervis Bay do you get regular 25-35 knots? Point Perpendicular lighthouse?
Buggered if I know why you would be looking at a Czech site(windguru.cz) for NSW weather.
If you are looking at NE, then Huskisson is the only good launch site and it is on the western side of the bay. Wind strength is similar to Kyeemagh on Botany Bay, but the chop is 3 times bigger.
With all due respect, I think you are wrong and it sounds like you have another agenda. Shame.
I've windsurfed there since 1987 and my parents live there. I know the place inside out. I've sailed at Huskisson in 25-35 knots with a 4.2 and sinker - many times. These days, I like to get maxed out on a 5.0 Koncept and slalom board. Maxed out on a 5.0 is bloody windy. I've done 30knot nautical miles - in metre high chop. It's a great place to sail.
I've sailed right across the bay, many times - to Calala Bay, to Honeymoon Bay and to Murray's Beach.
The wind is more regular, stronger, lasts longer and blows right through the night on a two to three day wind cycle - something I think doesn't happen anywhere else on the east coast.
I love the chop. You can pick it from a distance because of the smooth rolling action of the white horses. When it's 30knots+, the faces can be over 1.5m high.
I've also sailed Kyeemagh, scores of times. I've even raced there. It doesn't even come close to Jervis Bay for fun, wind and water clarity. Just the way it is.
As for looking at a Czeck site for NSW weather, you make it sound like I am advocating you use only Windguru. It's just an example using GFS. There are plenty of GFS websites. I read all the relevant weather sites and I use local knowledge when formulating an opinion about where to sail.
One thing is for sure, if I had the option of sailing at Kyeemagh or Jervis Bay, I would pick Jervis each and every time.
This is a vid I took at about 11AM one typical NE day. It was only 22-25knots at this point and I rigged a 5.0 Koncept. It picked up another 5 knots by noon.