JEDDAH — Heavy thunderstorms accompanied by hail and the risk of flash floods are forecast to persist across parts of Saudi Arabia from Friday through Tuesday, according to the National Center for Meteorology (NCM).The heaviest rainfall is expected across parts of Jazan and Asir, where conditions are forecast to intensify on Friday and Saturday.In Jazan, heavy rain is forecast at varying times in Al-Rayth, Harub, Al-Dayer, Al-Eidabi, Fayfa, Al-Aridah, Al-Harth and Al-Tuwal from August 21 to 25.Moderate to heavy rain is also forecast over Farasan, Al-Darb, Baysh, Sabya, Damad, Abu Arish, Ahad Al-Masarih and Samtah during the same period.In Asir, heavy rain is forecast at varying times from Friday to Tuesday in Abha, Khamis Mushait, Ahad Rafidah, Sarat Abidah, Al-Harajah, Dhahran Al-Janub, Al-Farshah, Al-Namas, Tanomah, Rijal Alma, Bareq, Mahayil Asir, Al-Majardah and Balqarn, with rainfall expected to intensify on Friday and Saturday.Bisha, Tathleeth, Tarib, Al-Amwah and Al-Birk in Asir are forecast to receive moderate to heavy rain during the period, reaching heavy levels on Friday and Saturday.In Al-Baha, moderate to heavy rain is forecast over Qilwah, Bani Hasan, Al-Qura, Al-Mikhwah, Al-Hajrah, Ghamid Al-Zinad, Baljurashi, Al-Mandaq and Al-Aqiq from Friday to Tuesday.