The Presidency of Meteorology and the Environment (PME) expects temperatures to drop Sunday over the northern, central and eastern regions of the Kingdom, with active surface winds causing poor visibility. The PME also expects poor visibility due to dust between Makkah and Madina. The PME said there would be cloud formations over the western part of the Kingdom extending up to the western parts of Riyadh region, with chances of cumulus clouds after midday on the southwestern and western highlands, particularly the Taif, Al-Baha and Asir highlands. The PME issued a warning on Friday evening about the possibility of a cold wave and active winds during the period Dec. 10 to 12, starting from the northern regions of the Kingdom, the coastal parts of Tabuk region and the northern part of the Red Sea. These conditions will begin on Sunday over the eastern, central, Madina and Makkah regions including their coastal areas until Monday. It will then affect the southern parts of the Kingdom. The areas that will be most affected by dust are Tabuk (especially the western parts), Madina and Makkah regions, including the coastal areas of these regions. The PME called on citizens, seafarers, fishermen and those using highways to be vigilant in the changing weather.