At the risk of sounding immature and sexist when I'm only trying to be funny...
Just have a little scale handy- wind speed to cup size For example: 8-12 knots would be a "Meg Ryan" day while 12-20 knots would be "Pamela Anderson" weather.
G-Cat 5.7M #583 (sail # currently 100) in Bradenton, FL
Hobie 14T
