Alaska Dispatch News reported on the January 30-31, 2017 eruption: "An hours-long eruption of Bogoslof volcano in the Aleutian Islands dropped a small amount of ash on nearby Unalaska overnight Tuesday from a massive plume that drifted over the Pacific Ocean.
Laura Kraegel, a reporter at Unalaska public radio station KUCB, said Tuesday morning that ash from the eruption wasn't easily visible in town.
"It's less than a millimeter but there's a sulfurous smell, so it's definitely apparent," Kraegel said.
Kristi Wallace, a geologist at the Alaska Volcano Observatory, said locals were sending photos of the ashfall, which was still considered "trace" because it hadn't exceeded a millimeter.
"I would not describe it as a continuous layer, so when it falls on snow you can see the snow in between and when it falls on cars it appears as droplets," Wallace said. "I don't think what they got is anything anyone could take out a ruler and measure."
The National Weather Service's Anchorage office received reports of trace ashfall in Unalaska from the plume by Tuesday morning. Joshua Maloy, an aviation meteorologist at the office, said the eruption, which began at 8:20 p.m. Monday according to the Alaska Volcano Observatory, had apparently ended by 3 a.m. Tuesday (https://www.adn.com/alaska-news/environment/2017/01/31/unalaska-receives-ashfall-after-bogoslof-eruption/)." Trace ashfall occurred in Nikolski on May 16 AKDT as a result on an eruption and on June 12 AKDT, residents of Unalaska/Dutch Harbor reported smelling sulfur, and winds were consistent with a source at Bogoslof.Aircraft
The National Weather Service CWSU noted a partial list of flight impacts: on Dec 20 and 21, flights were moved out of the path of a potential ash cloud. About 50 flights were impacted by North Pacific flight changes due to the January 18 explosion. Smaller planes en route to Dutch Harbor were diverted, and at least three flights returned to the airport they originated from. Some local carriers cancelled flights to the area. On January 30 and 31, the Dutch Harbor airport received a minor amount of ashfall, and the runways, taxiways, and ramps could not be used until ash was removed, impacting at least three flights.
An article featured on Earth, The Science Behind the Headlines reported that "On January 11, 2017, a flight from Tokyo to Minneapolis was rerouted southward due to low-level ash emissions from Bogoslof Volcano in the Aleutian Islands. Although no significant eruption occurred, the plane continued along the modified flight path rather than risk rerouting midflight in the event of increased volcanic activity" (https://www.earthmagazine.org/article/airplanes-and-ash-clouds-what-weve-learned-eyjafjallaj%C3%B6kull). The Alaska Dispatch News reported: "Robert Easton, an aviation forecaster with the National Weather Service's Alaska Aviation Weather Unit in Anchorage said, "It [Bogoslof's January 18, 2017 ash plume] has been affecting flights all night," Easton said. "At least three or four were affected at the minimum." Dave Barber, another forecaster at the weather unit, said forecasters were able to track pilots diverting around the ash cloud while the advisory was in effect. "We could see on plots of aircraft flight locations that they were avoiding the area, fortunately," Barber said (https://www.adn.com/alaska-news/aviation/2017/01/19/another-bogoslof-eruption-sends-ash-over-alaska-peninsula-kodiak-island/)." The Alaska Dispatch News reported on the January 30-31, 2017 eruption of Bogoslof: "About a dozen flights to or from Unalaska over the past 10 days had been canceled due to previous ashfall in the region, according to Shockley [Jennifer Shockley, Unalaska Department of Public Safety deputy director] (https://www.adn.com/alaska-news/environment/2017/01/31/unalaska-receives-ashfall-after-bogoslof-eruption/)." KUBC KIAL Unalaska Community Broadcasting reported that PenAir had cancelled Unalaska's midday flight due to the January 30-31, 2017 eruption (http://kucb.org/post/volcanic-ash-falls-unalaska-bogoslofs-longest-eruption-yet). Articles on Loadstar and Asia Fruit websites reported that Bogoslof ash clouds affected air travel, stating that "Asia-to-US airfreight capacity is tight after a series of volcanic eruptions in Alaska triggered an ash cloud that caused a number of flight cancellations" (http://www.fruitnet.com/asiafruit/article/172636/volcanic-ash).