BOAC;
Concur with both comments.
I know previous informative comments on "hydroplaning" have been made including the generally-accepted formula for same, (9 x √ tire press) but can't recall if the "stop-hydroplaning" speed was mentioned (forgive me if it has), but (out on a memory limb here) I believe it is 7 x √ tire pressure. We inflate our 320 mains to around 198psi so the speed at which hydroplaning would cease would be around 98kts.