i think the wind is more of a concern then fog. I was out a few weeks ago and it was so foggy across the entire lake you could not see 40 feet. They just said idle only and you launched and went. The wind was minimal.
Thats rare actually. For the fog conditions you describe they usually allow boats to launch but hold everyone in the ramp cove until the fog lifts. Heavy fog early is common in the winter with the warm water but occasionally it can last for the entire day. Wind? It’s based on high forecasted winds usually with fronts coming in that could catch boaters “unexpectedly” out on the water. That started a few years ago when park employees and our volunteer fire department had to search and rescue a boatload of tilapia netters in an “unseaworthy” boat overloaded with tilapia capsized in high winds late in the day. It’s a completely subjective call by the staff but I would be surprised if they held boats tomorrow/Saturday with the winds to 20mph forecasted all morning. At least that’s what my weather app predicts(Weather Bug).