


Special Marine Warning
Issued by NWS Duluth, MN
Issued by NWS Duluth, MN
372 WHUS53 KDLH 262134 SMWDLH LSZ140-141-162-262215- /O.NEW.KDLH.MA.W.0026.250726T2134Z-250726T2215Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Special Marine Warning National Weather Service Duluth MN 434 PM CDT Sat Jul 26 2025 The National Weather Service in Duluth MN has issued a * Special Marine Warning for... Grand Marais to Taconite Harbor MN... Grand Portage to Grand Marais MN... Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM... * Until 515 PM CDT. * At 433 PM CDT, severe thunderstorms capable of producing waterspouts, wind gusts to 40 knots, and hail to the size of pennies were located along a line extending from 8 nm south of Horseshoe Bay And Safe Harbor to 20 nm southwest of Grand Portage Marina to 6 nm southeast of Grand Marais Harbor, moving east at 40 knots. HAZARD...Waterspouts, wind gusts to 40 knots, and large hail. SOURCE...Radar. IMPACT...Waterspouts can easily overturn boats and create locally hazardous seas. Small craft could be damaged in briefly higher winds and suddenly higher waves. Large hail could result in structural damage. * Locations impacted include... Grand Marais Harbor. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor until hazardous weather passes. Thunderstorms can produce sudden waterspouts. Waterspouts can easily overturn boats and create locally hazardous seas. Seek safe harbor immediately. && LAT...LON 4779 8969 4751 8988 4766 9070 4775 9046 4783 9012 TIME...MOT...LOC 2133Z 281DEG 42KT 4772 8986 4771 9004 4766 9024 WATERSPOUT...POSSIBLE HAIL...>.75IN WIND...40KTS $$ Huyck