An explosive eruption of the Strombolian and sometimes Vulcanian types continues at Russian Klyuchevskoy volcano. The Aviation Color Code remains Orange.
On April 18, a lava flow began to move on the southeastern flank of the volcano.
By 22:10 UTC, a gas-steam plume containing some amount of ash was extending about 100 km (62 miles) to the NE of the volcano. It was rising up to 5.5 km (23 000 feet) above sea level.
According to satellite data received early April 20, a gas-steam plume containing some amount of ash was extending about 265 km (164 miles) SE of the volcano.
Ash explosions up to 5 - 7 km (16 400 - 23 000 feet) a.s.l. could occur at any time, KVERT warned, adding that ongoing activity could affect low-flying aircraft.