I'm only skimming these messages, but yes, she means that if you didn't have hurricane force winds and rain and you emptied the city in this way, you'd be in bumper-to-bumper traffic. So it's worse if you have bad weather.
Sheesh.
I read that this was the case the other day, but once they put into place the "contraflow" stuff -- let people drive on the wrong side of the road, doubling your capacity -- it got a lot better.
/jordan