Ah the joys of PA's. To the passengers, thunderstorms are "rain showers", all maintenance being conducted is "routine", it's "good news" when we have a wheels up time (ie spin it...bad news is we're delayed but hey they don't need to think that!!), and when you have to swap into a different airplane because the one you are on broke you're now on the "best and fastest" in the fleet.
I did have an awkward situation the other day though. As we taxied out you could see the storm to the east of the field. Rain just started falling and the wind flipped to a quartering tailwind, still steady and within limits. I elected not to go, wanting to see what would transpose, while another RJ behind us told the tower they were ready and we moved. The PA was a bit awkward - how do you explain to people who just saw another [insert mainline brand] express carrier depart and I'm on the PA saying I realize someone just took off, however I wasn't comfortable departing? So I just said that - I wasn't comfortable departing with the proximity of the storm. They really didn't give us any instruction in upgrade class about that stuff.