The first snow of the season has arrived in Bulgaria, covering parts of the mountains overnight. An orange code for rain and wet snow is in force today in ten districts across Northwestern, Central, and parts of Southern Bulgaria. In addition, a yellow code for rain and wet snow has been declared for another five districts in Western and Central Bulgaria. Though mandatory installation of winter tires takes effect from November 1, motorists are strongly advised to equip their vehicles with them now when traveling through mountain passes. Authorities warn that driving without proper tires increases the risk of accidents, particularly in areas where the snow is accumulating.