Hey Dave,
Welcome to Florida. Saturday is way off in the future regarding forecasts. They usually don't start to gel into place until about three days off and even less. Right now it is looking light and easterly on Saturday for St. Pete per NWS. Thermals can come out of almost no where regardless of what the forecast is at times as well. You never know though so keep the faith and have a great demo session on Saturday.
You can see what is in the forecast at:
http://fksa.org/showthread.php?t=5277
Dave showing a new board at the last Surf Expo