I just bought a CPO '07 IS 250 AWD and driving home last night in heavy rain, I experienced severe hydroplaning on the freeway. So much to the extent that I was nervous driving home and almost pulled over. Previously I owned an SC400, which occassionally hydroplaned while driving (as with any low sports car). However, last night I had never experienced hydroplaying in a car like this before. At one point, an alarm was triggered when I was hydroplaning and shut off when I brought the car back under control. The dealer indicated new tires were on the car so I would be very surprised if the tires were a factor. Overall, I am a good driver in the rain, having been raised in the Seattle area my whole life, so I am nervous about this experience I had last night and was hoping that someone has advice on best next steps e.g. possible stability alignment issue? Any information is greatly appreciated!