tdracer:
Regarding windshear - many airports in the US have ground based windshear detection systems (Doppler radar based, IIRC) so ATC can warn approaching aircraft or even temporarily close down a runway. Why wouldn't a major airport like Dubai have a similar system?
Most of the ground-based windshear detection systems used around the world employ doppler radar that relies on the reflectivity of water droplets in the air. They're not much good in dry conditions. Hong Kong has a LIDAR system to complement its Terminal Doppler Weather Radar (TDWR). The LIDAR uses an infrared laser to detect the movement of dust particles or aerosols in dry conditions. I don't know what type of equipment they have in Dubai.