Everything happens during the passage of a weather front in the area, althought not seeing very aggressive CBs the visibility should be very bad because it was a high moisture tropical air mass with persistent clouds and rain
I dont have permissions to publish links, so please add https stuff at the beginning
(and maybe someone can re-publish the links)
Weather radar:
i.imgur.com/BbJzRfM.gif
An Airforce video of the landing:
http://www.publico.pt/2018/11/12/vid...0181112-120548