RIYADH — The National Center of Meteorology (NCM) expects that most regions of Saudi Arabia will witness thunderstorms starting from Sunday until Thursday. Moderate to heavy rains will fall in the regions of Riyadh, Makkah, Al-Sharqiya, Al-Qassim, Asir, Al-Baha, Hail and Jazan. This will be accompanied with active dust, and low horizontal visibility. NCM said that light to moderate rains will start falling in the regions of Northern Borders, Makkah, Madinah starting from Monday.