The areas affected include... Duluth MN to Port Wing WI... Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM... Outer Apostle Islands Beyond 5 NM from Mainland... Port Wing to Sand Island WI... Sand Island to Bayfield WI... Silver Bay Harbor to Two Harbors MN... Taconite Harbor to Silver Bay Harbor MN... Two Harbors to Duluth MN...
At 1252 AM CDT, Doppler radar indicated a gust front, capable of producing winds to around 30 knots. This gust front was located along a line extending from 34 nm northwest of Castle Danger, moving southeast at 20 knots.