786 FZUS73 KLOT 181611 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1111 AM CDT Mon May 18 2026 LMZ740>745-777-779-181715- /O.CON.KLOT.MA.W.0032.000000T0000Z-260518T1715Z/ 1111 AM CDT Mon May 18 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 1215 PM CDT... For the following areas... Nearshore Waters from Winthrop Harbor to Calumet Harbor... Nearshore Waters from Calumet Harbor to Michigan City... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... At 1110 AM CDT, severe thunderstorms were located along a line extending from near Ohare Airport to 31st Street Harbor to near Gary, 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... Harrison-Dever Crib, Wilmette Harbor, 31st Street Harbor, Monroe Harbor, Burns Harbor, Calumet Harbor, Winthrop Harbor, Indiana Harbor, Montrose Harbor, Waukegan Harbor, Burnham Harbor, and Hammond Marina. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. && LAT...LON 4162 8733 4164 8743 4168 8743 4167 8747 4170 8751 4183 8760 4189 8762 4189 8760 4190 8762 4206 8767 4227 8783 4248 8780 4246 8702 4213 8696 4179 8697 4179 8696 4172 8691 4163 8716 4162 8732 4161 8732 TIME...MOT...LOC 1610Z 220DEG 41KT 4206 8788 4183 8760 4162 8738 HAIL...0.00IN WIND...50KTS $$ Birk  195 FZUS73 KLOT 181620 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1120 AM CDT Mon May 18 2026 LMZ740>745-777-779-181715- /O.CON.KLOT.MA.W.0032.000000T0000Z-260518T1715Z/ 1120 AM CDT Mon May 18 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 1215 PM CDT... For the following areas... Nearshore Waters from Winthrop Harbor to Calumet Harbor... Nearshore Waters from Calumet Harbor to Michigan City... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... At 1120 AM CDT, severe thunderstorms capable of producing waterspouts were located along a line extending from near Wilmette Harbor to 8 nm northeast of Calumet Harbor to near Marina Shores at Dune Harbor, moving northeast at 55 knots. HAZARD...Waterspouts and wind gusts in excess of 50 knots. SOURCE...Radar indicated. IMPACT...Waterspouts can easily overturn boats and create locally hazardous seas. Boats could suffer significant structural damage in high winds. Small craft could capsize in suddenly higher waves. Locations impacted include... Harrison-Dever Crib, Wilmette Harbor, 31st Street Harbor, Monroe Harbor, Burns Harbor, Calumet Harbor, Winthrop Harbor, Indiana Harbor, Montrose Harbor, Waukegan Harbor, Burnham Harbor, and Hammond Marina. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor immediately as gusty winds and high waves are expected. Thunderstorms can produce sudden waterspouts. Waterspouts can easily overturn boats and create locally hazardous seas. Seek safe harbor immediately. && LAT...LON 4162 8733 4164 8743 4168 8743 4167 8747 4170 8751 4183 8760 4189 8762 4189 8760 4190 8762 4206 8767 4227 8783 4248 8780 4246 8702 4213 8696 4179 8697 4179 8696 4172 8691 4163 8716 4162 8732 4161 8732 TIME...MOT...LOC 1620Z 231DEG 54KT 4215 8775 4184 8738 4171 8725 WATERSPOUT...POSSIBLE HAIL...0.00IN WIND...50KTS $$ Birk  423 FZUS73 KIWX 181627 MWSIWX Marine Weather Statement National Weather Service Northern Indiana 1227 PM EDT Mon May 18 2026 LMZ043-046-080-181730- /O.CON.KIWX.MA.W.0020.000000T0000Z-260518T1730Z/ 1227 PM EDT Mon May 18 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 130 PM EDT... For the following areas... 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... At 1226 PM EDT, severe thunderstorms were located along a line extending from 10 nm northeast of Harrison-Dever Crib to Burns Harbor, moving northeast at 55 knots. HAZARD...Wind gusts in excess of 50 knots. SOURCE...Radar indicated. Gary International Airport recorded a 50 knot wind gust. IMPACT...Boats could suffer significant structural damage in high winds. Small craft could capsize in 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 1626Z 236DEG 56KT 4204 8740 4166 8718 HAIL...0.00IN WIND...50KTS $$ Brown  401 FZUS73 KLOT 181650 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1150 AM CDT Mon May 18 2026 LMZ740>744-181659- /O.CAN.KLOT.MA.W.0032.000000T0000Z-260518T1715Z/ 1150 AM CDT Mon May 18 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Nearshore Waters from Winthrop Harbor to Calumet Harbor... Nearshore Waters from Calumet Harbor to Burns Harbor... The thunderstorms have moved out of the warned area and no longer pose a significant threat to boaters. A Severe Thunderstorm Watch remains in effect until 500 PM CDT for the adjacent waters of Lake Michigan. && LAT...LON 4196 8725 4223 8755 4248 8767 4246 8702 4213 8696 4179 8697 4179 8696 4172 8691 4165 8711 TIME...MOT...LOC 1649Z 230DEG 42KT 4234 8737 4201 8695 4176 8688 $$ LMZ745-777-779-181715- /O.CON.KLOT.MA.W.0032.000000T0000Z-260518T1715Z/ 1150 AM CDT Mon May 18 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 1215 PM CDT... For the following areas... Nearshore Waters from Burns Harbor to Michigan City... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... At 1149 AM CDT, severe thunderstorms were located along a line extending from 20 nm east of Waukegan Harbor to 16 nm northwest of New Buffalo to near Michigan City, 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. 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 4196 8725 4223 8755 4248 8767 4246 8702 4213 8696 4179 8697 4179 8696 4172 8691 4165 8711 TIME...MOT...LOC 1649Z 230DEG 42KT 4234 8737 4201 8695 4176 8688 HAIL...0.00IN WIND...50KTS $$ Birk