Big Lake weird

[prattvan]

I have a question about Big Lake. I'm kinda new to this. And I'm just learning Big Lake. I fish there about once a month. First time there was Nov 2015. I always look at the weather forecast before I go. The one's that show weather conditions hour by hour in advance. Where you can see the rain percentages and wind speed and direction from 1am to 8pm.
Why is it that the weather forecast will show S or SSE winds at 3 mph in the am picking up to lets say 6 mph by noon(which doesn't seem bad) and when I get there....... it's too rough to fish in a bass boat.