Marine Thunderstorm Wind — Ls W of in Saxon Hbr Wi To Grand Portage Mn Byd 5nm, Lake Superior

2016-07-21 · near Duluth, Ls W of in Saxon Hbr Wi To Grand Portage Mn Byd 5nm, Lake Superior

Event narrative

The wind gust measurement was from a tugboat, the Spartan.

Wider weather episode

A cluster of thunderstorms developed over eastern North Dakota and northwestern Minnesota the evening of Wednesday July 20th. The outflow from the storms coalesced into a couple main bow echoes that quickly sped across northeast and central Minnesota and then over western Lake Superior during the early morning hours of Thursday July 21st. It produced widespread straight-line wind gusts of 60 to 80 mph across northeast Minnesota, especially closer to the Duluth area by the time it reached Lake Superior. One of the hardest hit areas was Duluth, with a couple wind gust reports around 100 mph, including from the Algoma Guardian, a ship that was moving through the Duluth ship canal when the winds struck. The derecho raced across Lake Superior, doing damage to parts of the south side of the Lake along northwest Wisconsin, including to the Apostle Islands.

View location on OpenStreetMap → (46.9400, -91.5800)

Source: NOAA Storm Events Database, event_id 648003. Narrative written by the NWS forecast office that issued the report.