Oh Wendy, I understand your worries. I would be worried too if it were my deck getting concrete.
Have a morning adult beverage, take a few deep breaths, and listen to your brother rather than the weathermen. I'm going to do what I have to do when I need to settle my nerves - make a list of reasons to relax.
1. The concrete company does not want to lose money from a bad job, as your brother probably told you.
2. Concrete sets up quickly. They're beginning so early, I'm sure they will finish before any big rains.
3. Until possibly this evening, we shouldn't get more than spotty showers which is fine. My gunite was shot in rain.
4. The prediction for the possible TS for this evening will affect the coastline first. You guys are a good ways north of the coastline.
5. The weather models show Corpus getting the brunt of it. I realize that puts us on the dirty side, but we are hopefully east enough to only get mild rains.
6. No one is predicting it will slow and sit on top of us.
7. Al Roker (ok, I know he's not even a meteorologist, but whoever gives him the reports is right more often than our local guys) says the worst will be northwest of the Houston on up through Dallas and northward (poor Dallas and OK).
8. The crew will probably tarp the new concrete before they leave (or you could ask them to).
9. And.... you have many, many people pulling for you and your deck!
Keep us updated! Hugs. Suz.