Bogoslof Volcano is at it again with the latest eruption recorded on late Tuesday night through to Wednesday morning sending out an ash cloud over the Aleutian Islands.

The volcano became active in mid-December and ever since authorities, airliners, and US fishing port in the Aleutian islands have been on the alert. The latest eruption has forced all three to send out warnings. According to reports, the latest eruption was recorded at 10:36 p.m. on Tuesday and latest for around three hours during which it spewed ash to as high as 35,000 feet.

According to the National Weather Service the eruption could cause trace amounts — less than 1 millimeter — of ash to settle on Dutch Harbor, a major port for Bering Sea crab and pollock.

According to the U.S. Geological Survey, the latest eruption was the most significant event, which was marked by 200 lighting strikes and elevated seismic activity that lasted until 1:30 a.m. Wednesday. The eruption shut off in the very early hours on Wednesday. While it has stopped, the volcano remains in a heightened state of unrest and could erupt again at any time.

Any ash / ash cloud at the height of 20,000 feet or above are considered a threat to the jets flying between Asia and North America. The ash from volcanoes can erode jet engine turbine blades. Further, the ash melted by high temperatures in the engines adheres to critical parts and can cause engine failure. Ash can also scrape cockpit windows and interfere with electronics of navigation systems.

Ash that drifts to the cities could end up causing respiratory problems in people and animals and could also interfere with electrical equipment and damage air filters and gasoline engines.

Bogoslof Island is the tip of an underwater volcano that extends down 5,500 feet in a cone shape to the floor of the Bering Sea. The island first appeared after an underwater eruption in 1796. Subsequent explosions and eruptions have caused the island to grow and shrink. The current eruptions are from a shallow, underwater vent on the island’s southeast side.