If it were me, I wouldn't go. I would imagine they will be pulling A LOT of water and the water is going to be very muddy......personally, I've never done well at all when facing either of these conditions. It will probably also be pretty windy which makes things even worse.
I don't think it's necessarily the rain that makes the water muddy, I think it's them pulling the water out that muddys up the water, but that is just my $0.02.