453 WHUS53 KIWX 181606 SMWIWX LMZ043-046-080-181730- /O.NEW.KIWX.MA.W.0020.260518T1606Z-260518T1730Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Special Marine Warning National Weather Service Northern Indiana 1206 PM EDT Mon May 18 2026 The National Weather Service in Northern Indiana has issued a * Special Marine Warning for... 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... * Until 130 PM EDT. * At 1206 PM EDT, strong thunderstorms were located along a line extending from near Midway Airport to 10 nm southwest of Gary, moving northeast at 55 knots. HAZARD...Wind gusts to nearly 50 knots. SOURCE...Radar. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. * Locations impacted include... New Buffalo and Michigan City. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. Frequent lightning is occurring with these storms. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects. && 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 1606Z 236DEG 56KT 4187 8774 4149 8752 HAIL...0.00IN WIND...49KTS $$ Brown  267 WHUS53 KAPX 181622 SMWAPX LMZ346-366-181715- /O.NEW.KAPX.MA.W.0015.260518T1622Z-260518T1715Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Special Marine Warning National Weather Service Gaylord MI 1222 PM EDT Mon May 18 2026 The National Weather Service in Gaylord has issued a * Special Marine Warning for... Lake Michigan from Point Betsie to Manistee MI 5NM offshore to Mid Lake... Manistee to Point Betsie MI... * Until 115 PM EDT. * At 1222 PM EDT, strong thunderstorms were located 11 nm west of Arcadia, or 12 nm northwest of Portage Lake, moving northeast at 40 knots. HAZARD...Wind gusts to 40 knots. SOURCE...Radar. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. * Locations impacted include... Arcadia, Point Betsie, Pierport, Portage Lake, Williamsport, Manistee, and Frankfort. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor until hazardous weather passes. && LAT...LON 4473 8676 4470 8637 4470 8612 4467 8619 4456 8616 4441 8619 4422 8630 4422 8635 4426 8634 4428 8642 4422 8697 TIME...MOT...LOC 1622Z 231DEG 40KT 4448 8651 HAIL...0.00IN WIND...40KTS $$ ELD  509 WHUS53 KGRR 181630 SMWGRR LMZ844>846-874-876-878-181830- /O.NEW.KGRR.MA.W.0027.260518T1630Z-260518T1830Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Special Marine Warning National Weather Service Grand Rapids MI 1230 PM EDT Mon May 18 2026 The National Weather Service in Grand Rapids has issued a * Special Marine Warning for... Nearshore and Open Waters from St Joseph to Grand Haven MI... * Until 230 PM EDT. * At 1230 PM EDT, severe thunderstorms were located over Lake Michigan along a line extending from near Evanston Illinois to near Ogden Dunes Indiana, moving northeast at 45 knots. HAZARD...Wind gusts in excess of 50 knots. SOURCE...Radar. IMPACT...Boats could suffer significant structural damage in high winds. Small craft could capsize in suddenly higher waves. * Locations impacted include... St. Joseph Light, South Haven Light, Saugatuck Pier Heads, Holland Light, Port Sheldon Harbor, and Grand Haven Light. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. && 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 1629Z 225DEG 43KT 4212 8753 4173 8716 HAIL...0.00IN WIND...50KTS $$ CAS  030 WHUS53 KMKX 181642 SMWMKX LMZ646-675-181815- /O.NEW.KMKX.MA.W.0030.260518T1642Z-260518T1815Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Special Marine Warning National Weather Service Milwaukee/Sullivan WI 1142 AM CDT Mon May 18 2026 The National Weather Service in Milwaukee/Sullivan has issued a * Special Marine Warning for... Lake Michigan nearshore and open waters to mid lake Wind Point WI TO Winthrop Harbor IL... * Until 115 PM CDT. * At 1141 AM CDT, strong thunderstorms were located along a line extending from Waukegan Harbor, to 15 nm southeast of Winthrop Harbor, to 21 nm northeast of Harrison-Dever Crib, to near Michigan City, moving northeast at 35 knots. HAZARD...Wind gusts to 40 knots. SOURCE...Airport and marine observations. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. * Strong thunderstorms will remain over mainly open waters. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. && LAT...LON 4249 8780 4259 8782 4279 8748 4278 8706 4246 8702 TIME...MOT...LOC 1641Z 224DEG 37KT 4238 8781 4234 8750 4210 8715 4175 8695 HAIL...0.00IN WIND...40KTS $$ WOOD