[{SlideShowNav}] !!!Grimsvoetn volcano [{Image src='250ic.jpg' width='650' height='433' caption='Image courtesy of NASA. ' popup='false' alt='Grimsvoetn volcano' class='image_left'}] [{SET customtitle='Grimsvoetn volcano'}] On 21 May 2011, Grimsvoetn volcano rumbled to life and sent off a plume of ash and steam about 20 km (12 mi) into the atmosphere. Above Grimsvoetns summit, volcanic ash formed a circular brown plume that towered above the surrounding clouds. In the southeast, ash colored the snow surface dark brown. Ash from the volcano also reduced visibility to about 50 m (160 ft) in some areas, causing night-like darkness in the middle of the day.