Have you ever noticed how people forget how to drive in the rain? That first rain, in addition to be extra slick from all the oil on the road that's built up since the last rain coming up to the surface of the road making things extra slick, you have the people who don't react to the weather and speed just as much as on a dry day and then the people who over react and drive well beneith the speed limit. It's a bad mix. Usually a couple days into rain them average out, but that first day or two are awful.
Hurricane update... So far the dykes have held, though the Superdome has lost part of it's roof.