Yan District in Kedah State was faced with a flash flood from the foothill of Mount Jerai (Gunung Jearai). The flash flood happens on Wednesday 18th of August 2021 at 5.30 pm (Local Malaysian Time). The heavy downpour causes a water surge and landslides on Gunung Jerai that later hit Yan, Kuala Muda, Bandar Baharu district in Kedah by flash muddy floods. The surrounding location of Gunung Jerai Resort was severely damage. The difficult road access from the affected mud flash flood had hampered the search and rescue of the victim that believe to be drowned and flush with the strong current. The people affected by these flash floods have reached around 879 families (4,395 people) in the affected area of Yan District and 86 families (430 people) at Kubang Pasu District.