131 FZUS73 KMQT 201200 MWSMQT Marine Weather Statement National Weather Service Marquette MI 800 AM EDT Mon Jul 20 2026 LSZ263-201209- /O.CAN.KMQT.MA.W.0047.000000T0000Z-260720T1215Z/ 800 AM EDT Mon Jul 20 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park... The thunderstorm has weakened and no longer poses a significant threat to boaters. However, additional thunderstorms were approaching from the west and another Special Marine Warning is in effect for these storm. && LAT...LON 4735 8929 4748 8932 4761 8887 4731 8886 TIME...MOT...LOC 1155Z 264DEG 37KT 4747 8907 $$ NJL 581 FZUS73 KDLH 201210 MWSDLH Marine Weather Statement National Weather Service Duluth MN 710 AM CDT Mon Jul 20 2026 LSZ140-141-201219- /O.CAN.KDLH.MA.W.0034.000000T0000Z-260720T1230Z/ 710 AM CDT Mon Jul 20 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Grand Marais to Taconite Harbor MN... Grand Portage to Grand Marais MN... The thunderstorms have moved out of the warned area and no longer pose a significant threat to boaters. && LAT...LON 4709 9016 4720 9045 4760 9011 4777 8971 TIME...MOT...LOC 1209Z 270DEG 38KT 4772 8904 4733 8959 4717 9005 $$ LSZ162-201230- /O.CON.KDLH.MA.W.0034.000000T0000Z-260720T1230Z/ 710 AM CDT Mon Jul 20 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 730 AM CDT... For the following areas... Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM... At 709 AM CDT, severe thunderstorms were located along a line extending from 13 nm southeast of Rock of Ages Light to 10 nm east of The Western Lake Superior Buoy to 28 nm east of Devils Island, moving east at 40 knots. HAZARD...Wind gusts to 40 knots and large hail. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Large hail could result in structural damage. Severe thunderstorms will remain over mainly open waters. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. && LAT...LON 4709 9016 4720 9045 4760 9011 4777 8971 TIME...MOT...LOC 1209Z 270DEG 38KT 4772 8904 4733 8959 4717 9005 HAIL...>.75IN WIND...40KTS $$ JDS 767 FZUS73 KMQT 201217 MWSMQT Marine Weather Statement National Weather Service Marquette MI 817 AM EDT Mon Jul 20 2026 LSZ242>244-263-264-201315- 817 AM EDT Mon Jul 20 2026 A Marine Weather Statement has been issued for the following areas... Eagle River to Manitou Island MI... Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park... Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border... Ontonagon to Upper Entrance of Portage Canal MI... Upper Entrance of Portage Canal to Eagle River MI... At 816 AM EDT, Doppler radar indicated strong thunderstorms, capable of producing winds to around 30 knots and small hail. These thunderstorms were located along a line extending from 23 nm south of Mott Island Park Headquarters to 17 nm east of The Western Lake Superior Buoy, moving southeast at 35 knots. Locations impacted include... Grand Traverse Bay, Bete Grise, and The Upper Entrance of Portage Canal. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners can expect gusty winds to around 30 knots, locally higher waves, and lightning strikes. Boaters should seek safe harbor immediately until these storms pass. && LAT...LON 4752 8766 4739 8785 4739 8795 4733 8795 4719 8823 4714 8823 4714 8828 4702 8837 4698 8843 4699 8844 4692 8851 4707 8857 4714 8869 4703 8885 4731 8945 4769 8851 $$ NJL 812 FZUS73 KMQT 201218 MWSMQT Marine Weather Statement National Weather Service Marquette MI 818 AM EDT Mon Jul 20 2026 LSZ263-264-201230- /O.CON.KMQT.MA.W.0048.000000T0000Z-260720T1230Z/ 818 AM EDT Mon Jul 20 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 830 AM EDT... For the following areas... Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park... Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border... At 818 AM EDT, severe thunderstorms were located along a line extending from 17 nm southeast of Rock of Ages Light to 17 nm east of Devils Island, moving southeast at 30 knots. HAZARD...Wind gusts to 40 knots and large hail. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Large hail could result in structural damage. Locations impacted include... The Western Lake Superior Buoy. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. && LAT...LON 4777 8970 4778 8940 4774 8912 4784 8892 4768 8850 4702 9014 4704 9019 TIME...MOT...LOC 1218Z 309DEG 29KT 4769 8895 4711 9031 HAIL...>.75IN WIND...40KTS $$ NJL 040 FZUS73 KDLH 201219 MWSDLH Marine Weather Statement National Weather Service Duluth MN 719 AM CDT Mon Jul 20 2026 LSZ162-201229- /O.CAN.KDLH.MA.W.0034.000000T0000Z-260720T1230Z/ 719 AM CDT Mon Jul 20 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM... The thunderstorms have moved out of the area and no longer pose a significant threat to boaters. && LAT...LON 4709 9016 4720 9045 4760 9011 4777 8971 TIME...MOT...LOC 1218Z 305DEG 38KT 4766 8892 4727 8947 4711 8993 $$ JDS 266 FZUS73 KMQT 201224 MWSMQT Marine Weather Statement National Weather Service Marquette MI 824 AM EDT Mon Jul 20 2026 LSZ264-201233- /O.CAN.KMQT.MA.W.0048.000000T0000Z-260720T1230Z/ 824 AM EDT Mon Jul 20 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border... The thunderstorms have weakened and moved out of the area. && LAT...LON 4746 8954 4741 8919 4702 9014 4705 9018 4712 9013 TIME...MOT...LOC 1223Z 309DEG 29KT 4767 8891 4709 9027 $$ LSZ263-201230- /O.CON.KMQT.MA.W.0048.000000T0000Z-260720T1230Z/ 824 AM EDT Mon Jul 20 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 830 AM EDT... For the following areas... Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park... At 823 AM EDT, severe thunderstorms were located along a line extending from 20 nm southeast of Rock of Ages Light to 18 nm northeast of Oak Island, moving southeast at 30 knots. HAZARD...Wind gusts to 40 knots and large hail. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Large hail could result in structural damage. Severe thunderstorms will remain over mainly open waters. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. && LAT...LON 4746 8954 4741 8919 4702 9014 4705 9018 4712 9013 TIME...MOT...LOC 1223Z 309DEG 29KT 4767 8891 4709 9027 HAIL...>.75IN WIND...40KTS $$ NJL 681 FZUS73 KMQT 201230 MWSMQT Marine Weather Statement National Weather Service Marquette MI 830 AM EDT Mon Jul 20 2026 LSZ263-201238- /O.EXP.KMQT.MA.W.0048.000000T0000Z-260720T1230Z/ 830 AM EDT Mon Jul 20 2026 ...THE SPECIAL MARINE WARNING WILL EXPIRE AT 830 AM EDT... The affected areas were... Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park... The thunderstorms have moved out of the area and no longer pose a significant threat to boaters. && LAT...LON 4746 8954 4741 8919 4702 9014 4705 9018 4712 9013 TIME...MOT...LOC 1228Z 309DEG 29KT 4765 8888 4707 9024 $$ NJL 701 FZUS73 KAPX 201235 MWSAPX Marine Weather Statement National Weather Service Gaylord MI Issued by National Weather Service Detroit/Pontiac MI 835 AM EDT Mon Jul 20 2026 LSZ322-201630- 835 AM EDT Mon Jul 20 2026 ...WATER LEVEL FLUCTUATIONS ON THE ST. MARY'S RIVER... Water level gauges on the St. Mary's River are indicating rapidly changing water levels due to thunderstorm activity on Lake Superior. Southwest Pier Water levels dropped 13 inches between 645 AM and 800 AM. Several cycles of water level falls and rises are likely prior to noon. Largest changes in water levels...up to 3 feet or more...can be expected on upper portions of the river from Point Iroquois to the locks at Sault Ste. Marie. Water level changes up to one foot can be expected from below the Soo Locks to Munuscong Lake. Mariners should be aware of rapidly rising and falling water levels...particularly for operators above the Soo Locks. Be sure to monitor marine radio for information on this situation. && LAT...LON 4652 8412 4642 8415 4623 8410 4614 8419 4622 8432 4626 8424 4634 8426 4645 8433 4646 8440 4641 8445 4641 8450 4637 8455 4640 8463 4645 8465 4651 8462 4646 8456 4645 8448 4650 8439 4649 8428 4654 8419 $$ Mann 871 FZUS73 KDLH 201246 MWSDLH Marine Weather Statement National Weather Service Duluth MN 746 AM CDT Mon Jul 20 2026 LSZ140-141-162-201330- 746 AM CDT Mon Jul 20 2026 ...A STRONG THUNDERSTORM APPROACHING THE WATERS... The areas affected include... 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... At 745 AM CDT, Doppler radar indicated a strong thunderstorm, capable of producing winds to around 30 knots and small hail. This thunderstorm was located 8 nm west of Grand Marais Harbor, or 25 nm west of Horseshoe Bay And Safe Harbor, moving southeast at 50 knots. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners can expect gusty winds to around 30 knots, locally higher waves, and lightning strikes. Boaters should seek safe harbor immediately until this storm passes. && LAT...LON 4764 8979 4732 9001 4760 9084 4772 9055 4779 9028 $$ JDS