US: Increased volcanic activity continues at Mount Shishaldin, Alaska, as of July 23

Event

Officials with the Alaska Volcano Observatory (AVO) have observed increased levels of volcanic activity at the Mount Shishaldin volcano, located approximately 30 km (18.6 miles) west of False Pass. The volcano produced an ash plume rising 9,000 meters (30,000 feet) following an eruptive event early July 23. Volcanic material was sent east-northeast from the crater, resulting in possible ashfall in the False Pass area. The aviation color code was raised to Red and the Volcano Alert Level to Warning (the top levels on a four-tier scale).

Eruptions from Mount Shishaldin could cause further low-level seismic activity, ash clouds, and landslides in the surrounding area. People, especially those with underlying pulmonary conditions such as asthma, COPD, or lung cancers, may experience difficulty breathing and suffer lower tolerance to physical exertion than healthier individuals. Such individuals should take additional precautions to avoid excessive ash exposure.

Transport
Transport disruptions are possible in the surrounding area, especially if a significant eruption occurs. Road conditions could quickly deteriorate during periods of substantial ashfall. Authorities advise motorists to drive with extreme caution as ash can result in poor visibility and, when wet, make roads slippery. Officials may close roads near the volcano depending on the presence of hazardous volcanic material. Fine particulate matter ejected from the volcano could pose a hazard to flights in the surrounding airspace; the airports closest to the erupting volcano that might be impacted by the eruption are the Cold Bay Airport (CDB), around 90 km (55 miles) northeast of Mount Shishaldin, and the Akutan Airport (KQA) 130 km (80 miles) southwest of Mount Shishaldin. Officials advise aircraft to avoid flying close to the summit due to potentially hazardous ash.

Advice

Confirm flights if a large eruption occurs. Heed evacuation orders and the advice of local authorities. Prepare for localized traffic disruptions if operating near the volcano over the coming days. Do not check out of accommodation until onward travel is confirmed. Seek updated information on road conditions before driving; due to reduced visibility, drive cautiously in areas affected by ash. Carry facemasks and observe other precautions to avoid ash inhalation if operating in the affected area. Ash may cause respiratory irritation; individuals who suffer from pre-existing respiratory problems should carry adequate medication. Drink only bottled water, as sulfur in the volcanic ash may contaminate local drinking water.