829 FZUS73 KGRR 181700 MWSGRR Marine Weather Statement National Weather Service Grand Rapids MI 100 PM EDT Mon May 18 2026 LMZ844>846-874-876-878-181830- /O.CON.KGRR.MA.W.0027.000000T0000Z-260518T1830Z/ 100 PM EDT Mon May 18 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 230 PM EDT... For the following areas... Nearshore and Open Waters from St Joseph to Grand Haven MI... At 100 PM EDT, severe thunderstorms were located along a line extending from 28 nm east of Winthrop Harbor to 17 nm west of St. Joseph Light to 10 nm southwest of St. Joseph, moving northeast at 45 knots. HAZARD...Wind gusts in excess of 50 knots. SOURCE...Radar indicated. IMPACT...Boats could suffer significant structural damage in high winds. Small craft could capsize in suddenly higher waves. Locations impacted include... Saugatuck Pier Heads, South Haven Light, St. Joseph Light, Port Sheldon Harbor, Grand Haven Light, Holland Light, and St. Joseph. PRECAUTIONARY/PREPAREDNESS ACTIONS... Boaters should seek safe harbor immediately until these storms pass. Wind gusts in excess of 50 knots, high waves, dangerous lightning, and heavy rain are possible with these storms. && LAT...LON 4213 8656 4212 8696 4279 8706 4306 8670 4306 8625 4294 8622 4269 8621 4245 8626 4225 8635 4211 8649 TIME...MOT...LOC 1700Z 225DEG 44KT 4237 8717 4219 8687 4197 8664 HAIL...0.00IN WIND...50KTS $$ THOMAS  600 FZUS73 KLOT 181711 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1211 PM CDT Mon May 18 2026 LMZ745-777-779-181720- /O.EXP.KLOT.MA.W.0032.000000T0000Z-260518T1715Z/ 1211 PM CDT Mon May 18 2026 ...THE SPECIAL MARINE WARNING WILL EXPIRE AT 1215 PM CDT... The affected areas were... Nearshore Waters from Burns Harbor to Michigan City... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... The thunderstorms have moved out of the area and no longer pose a significant threat to boaters. A Severe Thunderstorm Watch remains in effect until 500 PM CDT for the adjacent waters of Lake Michigan. && LAT...LON 4196 8725 4223 8755 4248 8767 4246 8702 4213 8696 4179 8697 4179 8696 4172 8691 4165 8711 TIME...MOT...LOC 1710Z 225DEG 54KT 4255 8708 4222 8666 4197 8659 $$ Kluber  847 FZUS73 KMKX 181714 MWSMKX Marine Weather Statement National Weather Service Milwaukee/Sullivan WI 1214 PM CDT Mon May 18 2026 LMZ646-181723- /O.CAN.KMKX.MA.W.0030.000000T0000Z-260518T1815Z/ 1214 PM CDT Mon May 18 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Nearshore waters from Wind Point WI TO Winthrop Harbor IL... The thunderstorms have moved out of the warned area and no longer pose a significant threat to boaters. && LAT...LON 4249 8767 4262 8767 4272 8760 4279 8748 4278 8706 4246 8702 TIME...MOT...LOC 1713Z 224DEG 37KT 4260 8752 4256 8721 4232 8686 4197 8666 $$ LMZ675-181815- /O.CON.KMKX.MA.W.0030.000000T0000Z-260518T1815Z/ 1214 PM CDT Mon May 18 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 115 PM CDT... For the following areas... Lake Michigan nearshore and open waters to mid lake Wind Point WI TO Winthrop Harbor IL... At 1213 PM CDT, strong thunderstorms were located along a line extending from 14 nm northeast of Winthrop Harbor, to 27 nm southeast of Wind Point, to 20 nm northwest of St. Joseph Lighthouse, to 11 nm southwest of St. Joseph, moving northeast at 35 knots. HAZARD...Wind gusts to 40 knots. SOURCE...Airport and marine observations. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Strong thunderstorms will remain over mainly open waters. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. && LAT...LON 4249 8767 4262 8767 4272 8760 4279 8748 4278 8706 4246 8702 TIME...MOT...LOC 1713Z 224DEG 37KT 4260 8752 4256 8721 4232 8686 4197 8666 HAIL...0.00IN WIND...40KTS $$ WOOD  382 FZUS73 KIWX 181724 MWSIWX Marine Weather Statement National Weather Service Northern Indiana 124 PM EDT Mon May 18 2026 LMZ043-046-080-181734- /O.EXP.KIWX.MA.W.0020.000000T0000Z-260518T1730Z/ 124 PM EDT Mon May 18 2026 ...THE SPECIAL MARINE WARNING WILL EXPIRE AT 130 PM EDT... The affected areas were... Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.... Michigan City IN to New Buffalo MI... New Buffalo MI to St Joseph MI... The thunderstorms have moved onshore and no longer pose a significant threat to boaters. A Severe Thunderstorm Watch remains in effect until 600 PM EDT for northwestern Indiana...southwestern Michigan...and the adjacent waters of Lake Michigan. && LAT...LON 4179 8696 4179 8697 4212 8696 4213 8657 4211 8649 4194 8658 4189 8662 4180 8675 4179 8676 4172 8691 TIME...MOT...LOC 1724Z 236DEG 56KT 4252 8644 4214 8622 $$ DN  513 FZUS73 KMKX 181728 MWSMKX Marine Weather Statement National Weather Service Milwaukee/Sullivan WI 1228 PM CDT Mon May 18 2026 LMZ675-181815- /O.CON.KMKX.MA.W.0030.000000T0000Z-260518T1815Z/ 1228 PM CDT Mon May 18 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 115 PM CDT... For the following areas... Lake Michigan from Wind Point WI TO Winthrop Harbor IL 5 nm off shore to mid lake... At 1227 PM CDT, strong thunderstorms were located along a line extending from 21 nm east of Wind Point, to 33 nm west of Holland Lighthouse, to 14 nm northwest of South Haven Lighthouse, to 6 nm northeast of St. Joseph Lighthouse, moving northeast at 50 knots. HAZARD...Wind gusts to 40 knots. SOURCE...Airport and marine observations. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Strong thunderstorms will remain over mainly open waters. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. && LAT...LON 4247 8720 4263 8731 4279 8733 4278 8706 4246 8702 TIME...MOT...LOC 1727Z 217DEG 50KT 4276 8727 4274 8698 4253 8657 4218 8637 HAIL...0.00IN WIND...40KTS $$ WOOD  808 FZUS73 KGRR 181732 MWSGRR Marine Weather Statement National Weather Service Grand Rapids MI 132 PM EDT Mon May 18 2026 LMZ844>846-874-876-878-181830- /O.CON.KGRR.MA.W.0027.000000T0000Z-260518T1830Z/ 132 PM EDT Mon May 18 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 230 PM EDT... For the following areas... Nearshore and Open Waters from St Joseph to Grand Haven MI... At 131 PM EDT, severe thunderstorms were located along a line extending from 21 nm west of Saugatuck Pier Heads to 11 nm west of South Haven Light to 10 nm northeast of St. Joseph Light, moving northeast at 45 knots. HAZARD...Wind gusts in excess of 50 knots. SOURCE...Weather Station. At 125 pm Benton Harbor Airport reported 63 mph winds. IMPACT...Boats could suffer significant structural damage in high winds. Small craft could capsize in suddenly higher waves. Locations impacted include... Saugatuck Pier Heads, South Haven Light, St. Joseph Light, Port Sheldon Harbor, Grand Haven Light, Holland Light, and St. Joseph. PRECAUTIONARY/PREPAREDNESS ACTIONS... Boaters should seek safe harbor immediately until these storms pass. Wind gusts in excess of 50 knots, high waves, dangerous lightning, and heavy rain are possible with these storms. && LAT...LON 4213 8675 4271 8681 4305 8668 4306 8625 4294 8622 4269 8621 4245 8626 4225 8635 4211 8649 4213 8656 TIME...MOT...LOC 1731Z 224DEG 43KT 4258 8669 4243 8654 4221 8631 HAIL...0.00IN WIND...50KTS $$ THOMAS  882 FZUS73 KMKX 181734 MWSMKX Marine Weather Statement National Weather Service Milwaukee/Sullivan WI 1234 PM CDT Mon May 18 2026 LMZ675-181743- /O.CAN.KMKX.MA.W.0030.000000T0000Z-260518T1815Z/ 1234 PM CDT Mon May 18 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Lake Michigan from Wind Point WI TO Winthrop Harbor IL 5 nm off shore to mid lake... The thunderstorms have moved out of the area and no longer pose a significant threat to boaters. && LAT...LON 4247 8720 4263 8731 4279 8733 4278 8706 4246 8702 TIME...MOT...LOC 1731Z 224DEG 37KT 4279 8723 4277 8694 4256 8653 4221 8633 $$ WOOD  726 FZUS73 KGRR 181751 MWSGRR Marine Weather Statement National Weather Service Grand Rapids MI 151 PM EDT Mon May 18 2026 LMZ844>846-874-876-878-181830- /O.CON.KGRR.MA.W.0027.000000T0000Z-260518T1830Z/ 151 PM EDT Mon May 18 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 230 PM EDT... For the following areas... Nearshore and Open Waters from St Joseph to Grand Haven MI... At 151 PM EDT, severe thunderstorms were located along a line extending from near Holland Light to near Saugatuck Pier Heads to 13 nm southeast of South Haven Light, moving northeast at 40 knots. HAZARD...Wind gusts in excess of 50 knots. SOURCE...Radar indicated. IMPACT...Boats could suffer significant structural damage in high winds. Small craft could capsize in suddenly higher waves. Locations impacted include... Saugatuck Pier Heads, South Haven Light, Port Sheldon Harbor, Grand Haven Light, Holland Light, and St. Joseph. PRECAUTIONARY/PREPAREDNESS ACTIONS... Boaters should seek safe harbor immediately until these storms pass. Wind gusts in excess of 50 knots, high waves, dangerous lightning, and heavy rain are possible with these storms. && LAT...LON 4253 8656 4289 8657 4306 8625 4294 8622 4269 8621 4245 8626 4225 8635 4211 8649 TIME...MOT...LOC 1751Z 230DEG 39KT 4280 8635 4260 8617 4228 8602 HAIL...0.00IN WIND...50KTS $$ THOMAS