It’s shaping up to be a grey, unsettled Thursday across the UAE. The National Centre of Meteorology (NCM) forecasts partly cloudy to cloudy skies at times, with convective clouds developing over scattered areas and bringing intermittent rain, which could turn heavy in some places.The NCM said the unstable weather is being driven by an extension of a surface low-pressure system, along with an upper-air low-pressure system.Showers are possible…