tweake:i think the intensity and speed caught them out. there was nothing all that bad on the rain radar. a bit of flooding in heavy rain is expected, no one expected that amount in such a short time period.
Actually competent weather services didn't seem to have this problem, WU was reporting 40mm a day or two in advance, then it began to creep worryingly up and up the closer it got. Metservice dropped the ball on this one almost as badly as Mayor Brown did.