Greg from Sheb. wrote:
With the formation of white caps for example, it is my impression that in spring when the water is cold, the air is still cool and white caps seems to form at lower wind speed than in the summer during a afternoon thermal. Is there any scientific evidence of that?
Tom Skilling WGN-TV chief meteorologist had a nice video segment on this that I can't find. Air temp relative to water temp. You want cool air on warm water for the best "push" on waves. He showed why waves are bigger in the fall than the spring on Lake Michigan. The cold water cools the air 3 feet above the water making a buffer. Warmer air rides over the top. Cool air on warm water makes the biggest waves. Your summer warmer air is riding over the top of the cooler buffer.
Greg from Sheb. wrote:
Also, an other determining factor that's been interesting to experience: I found that sailing on freshwater often requires a sail larger than on saltwater for a similar wind speed. In the warm 84 degrees water and air of the Caribbean, I was surprised I could easily plane a 115l with a 7.2 in slightly less than 15kn (I'm 190lb!). In contrast, on Lake Michigan, I need 13-14kn established with the 8.5 and 16-17kn with the 7.0. ... I'm guessing this situation might have something to do with the extra buoyancy that ocean saltwater offers... more floaty, less pushing water and faster release maybe?
- Salt water buoyancy like you said, and planing power/lift on salt water
- Wind at sea level(more pressure)
- Ocean steady trade wind.
- Warm water - no 3 foot cold air buffer above the water.