@MasterkeunWoowwww, relax, it's just rain of water, not a rain of bullets. It won't tear up jackets, just soak them. And the mud will not form a wave, it's just the ground getting slightly slipery--progressively. At first, things'll be fine, then slowly it get slippery. At its peak it'll only have you ankle-high in mud--and that's exactly that, at its peak, which is several hours away from the beginning. and again, the mud doesn't form mudslides, that'd actually kill people...
I mean, I enjoy a sense of drama, but this is a bit over the top. It's just rain.