Interesting but this isn't the same as a regular flight into a busy airport like LCY - much of the year they don't get much rain at all
If the runway is wet you don't take-off until it is dry - admittedly there'd be a delay issue but it might not be very long - the aircraft will blocked out for some considerable time anyway
As someone has already posted you need to talk to TAP or anyone else who flies into Funchal and similar on a regular basis