The Sinabung volcano on Indonesia's Sumatra Island erupted Saturday spewing ash and smoke 2,000 meters (6,600 feet) above its crater. The Center for Volcanology and Geological Hazar Mitigation (PVMBG) warned residents should not have any activity near the volcano, with official Muhammed Nurul Assori de Naman urging those in the Teran, Berastagi, Simpang and Merdeka regions are being warned to wear masks to shield against ash rain. The volcano reactivated for the first time in four centuries in 2010. A total of 23 people were killed in 2014 and 2016 from eruptions.
This resulted in major food shortages across the Northern Hemisphere.
Evidence suggests that the anomaly was predominantly a volcanic winter event caused by the massive 1815 eruption of Mount Tambora in the Dutch East Indies (the largest eruption in at least 1,300 years after the extreme weather events of 535–536), perhaps exacerbated by the 1814 eruption of Mount Mayon which is at this moment very volatile in the Philippines.