Car drivers are being warned about low visibility on Makkah and Madina highways next Monday. The Presidency of Meteorology and Environment also says humidity will increase in the southwest and west heights. There is also a chance of fog in the early morning and cumulus clouds in the afternoon in Jizan, Asir and Al-Baha heights. Meanwhile, temperatures are expected to remain unchanged all over the Kingdom. However there will be a slight increase in temperatures in the west and north of the Kingdom and western parts of the central region. Northwest surface winds will blow at speeds of 15-38 km/h over the Red Sea and waves will be moderate. __