Re 35 knots crosswind and 800m in heavy rain”
Useful guidance is given in the
Canadian AIM, AIR Para 1.6 (Aeronautical Information Manual – 12 Apr 07) where crosswinds are related to CRFI (Canadian Runway Friction Index).
Although CRFI is not widely used outside of Canada, table 4a surface conditions, and table 3 crosswind limits can be used for guidance.
From table 4a, heavy rain (where aquaplaning might be expected) relates to icy conditions which gives a CRFI in the range 0.15 – 0.3.
Entering these values into table 3 indicates that the maximum crosswind should be 15 kts.
Note that para 1.6.5 provides an example of aquaplaning in a 10kt crosswind resulting in drifting off a 200ft wide runway in 7secs !