Sail to wind ratio

Question
My name is Moshe, i live in Israel, we have great winds here in Galili lake 18-30mph. I'm beginner+ 3 years experience using JP135. I manage to do waterstart and surt in the straps. my weight is :190lb and i need your help matching the right sail size to the right wind. i have 4.5, 5.5, 6, 7, 8 [m2] sail. please advice. BTW if anyone happend to be in Israel it will be my pleasure to host him and surf together :)

Answer
Hey Moshe,

Wind-mph   Sail size       
   14         9.5
   16         8.5
   18         7.5
   21         6.5
   23         5.8
   25        5.2
   28          4.8
   30         4.5


These are average sail sizes to wind speed ratios and assume the sailor is reasonably proficient at riding a shortboard. Recommended sail sizes lean towards the smallest that will get you comfortably on a plane, not the biggest that you can hold in the wind. A sail's usable range may extend slightly below and well above these recommendations, especially for skilled riders.                           
Hope this helps.
Keep on sailing,
Windlover