Strong winds at the airport are causing huge problems.
Two planes have managed to land but only after aborted landings, now Easyjet Lisbon has tried to land twice and aborted and is heading back to Lisbon.
Norwegian Air already cancelled their rescheduled flight for this morning, and I can see many more cancellations through the day.
I believe he BA flight that diverted to Lisbon last night is going back to Gatwick this morning.
You can keep an eye on flight arrivals here