For a car tire, wide means more hydroplan danger, but even wide bicycle tires are so narrow that width make no difference in wet conditions - they can't hydroplane the way car tires can (Specialized prved this years ago with a series of tests). Usually the problem is simply road dirt causing slick roads that only a knobby could help you with (and it's not the width of the tire, its the knobs giving greater point friction). If it rains hard, that is good because it washes the dirt off the road and the tires will actually grip better! So, use the usual tires and go like hell.

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"My strategy is to start out slow and then peter-out altogether" Walt Stack