If he wants to drive home, then that's his decision,.
Your decision is whether or not you want to be in the car with him.
Your decision is completely independent of his decision,
And don't feel bad about disagreeing with him - your assessment of the driving conditions is as valid as his!
(actually, probably more valid because you're taking notice of the weather warnings 😳)
So, you have several options:
(1) refuse to drive home with him tomorrow
(2) get in the car and panic
(3) hide the keys so he can't drive
(4) ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, get a quote for a new patio
................................. stick to your guns, girl!! xx