Thunderstorm Wind in Taiya Inlet, Alaska

A sudden wind shift to the south from a squall line measured a peak gust of 59mph at the Skagway Airport at 515pm and a peak gust of 52mph at the same time at the Skagway Harbor. Some missing data that was automatically QC'd out from the Marine Exchange station was later recovered.

On the afternoon of Monday, June 16th, 2025, a fast-moving squall line of thunderstorms tracked northward across the central and northern Panhandle, resulting in damaging wind gusts and localized impacts, particularly in the Juneau area.

Analysis indicates that the primary storm structure was a squall line. The squall line stretched across the panhandle and the Inside Passage east to west, beginning sub-severe in the vicinity of Wrangell around noon, reaching severe criteria as it tracked up Stephen's Passage, then continued northward, reaching Skagway shortly after 5pm.

As the squall line reached the City and Borough of Juneau just after 3pm, a sudden onset of high winds of 50+ mph led to multiple damage reports across the area. The most significant incident occurred at the AJ Dock, where mooring lines securing a cruise ship snapped, causing the vessel to drift from the dock. Additional impacts across Juneau included broken tree limbs, shattered vehicle windshields, and temporary power outages.

Near the Juneau International Airport, a gustnado was also observed crossing Egan Drive and the airport parking lot. After reviewing satellite imagery, eyewitness reports, and surface observations, the NWS has confirmed the occurrence of a gustnado in the vicinity of the airport and is categorized as a thunderstorm wind event event within the severe squall line.