BTW - my daughter lives in La Porte. We are having the same heavy rain in Indy with flash flood warnings.

You don't mention what engine you have in your X5, but can you easily remove the coil packs and plugs from cylinders 3,4 and 5 and visually inspect them? (Pretty easy on my 3.0 N52 engine) Can you sit a small fan in the engine bay and try to dry everything out?

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12 335i mSport Space Gray Metallic
09 X5 3.0 Space Gray Metallic
01 740i Sport Anthracite Metallic