972 FZUS73 KLOT 180326 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1026 PM CDT Fri Apr 17 2026 LMZ740-180336- /O.CAN.KLOT.MA.W.0029.000000T0000Z-260418T0430Z/ 1026 PM CDT Fri Apr 17 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Nearshore Waters from Winthrop Harbor to Wilmette Harbor... The thunderstorms have moved out of the warned area and no longer pose a significant threat to boaters. A Tornado Watch remains in effect until 1100 PM CDT for northeastern Illinois...and the adjacent waters of Lake Michigan. && LAT...LON 4172 8691 4165 8715 4178 8721 4198 8726 4187 8762 4189 8762 4189 8760 4190 8762 4203 8759 4214 8755 4230 8753 4247 8756 4246 8702 4213 8696 4179 8697 4179 8696 TIME...MOT...LOC 0326Z 238DEG 44KT 4251 8748 4229 8739 4212 8738 4171 8755 $$ LMZ741-745-777-779-180430- /O.CON.KLOT.MA.W.0029.000000T0000Z-260418T0430Z/ 1026 PM CDT Fri Apr 17 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT... For the following areas... Nearshore Waters from Wilmette Harbor to Northerly Island... Nearshore Waters from Burns Harbor to Michigan City... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... At 1026 PM CDT, strong thunderstorms were located along a line extending from 14 nm east of Winthrop Harbor to 19 nm east of Waukegan Harbor to 13 nm east of Wilmette Harbor to Calumet Harbor, moving northeast at 45 knots. HAZARD...Wind gusts to nearly 50 knots. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Locations impacted include... Harrison-Dever Crib, Monroe Harbor, Burns Harbor, and DuSable Harbor. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 1100 PM CDT for northeastern Illinois...and the adjacent waters of Lake Michigan. Move to safe harbor until hazardous weather passes. && LAT...LON 4172 8691 4165 8715 4178 8721 4198 8726 4187 8762 4189 8762 4189 8760 4190 8762 4203 8759 4214 8755 4230 8753 4247 8756 4246 8702 4213 8696 4179 8697 4179 8696 TIME...MOT...LOC 0326Z 238DEG 44KT 4251 8748 4229 8739 4212 8738 4171 8755 HAIL...0.00IN WIND...49KTS $$ Birk  979 FZUS73 KLOT 180327 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1027 PM CDT Fri Apr 17 2026 LMZ741>745-779-180400- /O.CON.KLOT.MA.W.0028.000000T0000Z-260418T0400Z/ 1027 PM CDT Fri Apr 17 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT... For the following areas... Nearshore Waters from Wilmette Harbor to Calumet Harbor... Nearshore Waters from Calumet Harbor to Michigan City... Open Waters from Wilmette Harbor to Michigan City out to Mid Lake... At 1027 PM CDT, severe thunderstorms capable of producing waterspouts were located along a line extending from 9 nm northeast of Harrison-Dever Crib to 8 nm northeast of Jackson Park Harbor to near Calumet Harbor, moving east at 30 knots. HAZARD...Waterspouts and wind gusts to nearly 50 knots. SOURCE...Radar indicated. IMPACT...Waterspouts can easily overturn boats and create locally hazardous seas. Small craft could be damaged in briefly higher winds and suddenly higher waves. Locations impacted include... Calumet Harbor, Indiana Harbor, 31st Street Harbor, Monroe Harbor, Burns Harbor, Marina Shores at Dune Harbor, Burnham Harbor, 59th Street Marina, Hammond Marina, Jackson Park Harbor, and DuSable Harbor. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 1100 PM CDT for northeastern Illinois...northwestern Indiana...and the adjacent waters of Lake Michigan. 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 8744 4169 8750 4175 8753 4179 8758 4178 8758 4188 8762 4211 8696 4179 8697 4179 8696 4172 8691 4166 8709 4165 8714 4163 8716 4162 8732 4161 8732 TIME...MOT...LOC 0327Z 263DEG 29KT 4199 8739 4184 8740 4169 8762 WATERSPOUT...POSSIBLE HAIL...0.00IN WIND...49KTS $$ Birk  586 FZUS73 KGRR 180348 MWSGRR Marine Weather Statement National Weather Service Grand Rapids MI 1148 PM EDT Fri Apr 17 2026 LMZ844>847-872-874-876-878-180445- /O.CON.KGRR.MA.W.0019.000000T0000Z-260418T0445Z/ 1148 PM EDT Fri Apr 17 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT... For the following areas... Nearshore and Open Waters from St Joseph to Whitehall MI... At 1148 PM EDT, strong thunderstorms were located along a line extending from near Grand Haven Light to 29 nm northwest of St. Joseph Light to near New Buffalo, moving northeast at 35 knots. HAZARD...Wind gusts to 40 knots and small hail. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Locations impacted include... South Haven Light, St. Joseph Light, White Lake Pier Heads, Mona Lake Channel, Holland Light, The White Lake Pierheads, Muskegon Light, and St. Joseph. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor until hazardous weather passes. && LAT...LON 4213 8656 4212 8696 4337 8714 4340 8643 4312 8627 4277 8621 4248 8625 4225 8635 4211 8649 TIME...MOT...LOC 0348Z 230DEG 37KT 4311 8625 4240 8703 4190 8680 HAIL...<.75IN WIND...40KTS $$ OSTUNO  388 FZUS73 KIWX 180351 MWSIWX Marine Weather Statement National Weather Service Northern Indiana 1151 PM EDT Fri Apr 17 2026 LMZ043-046-080-180500- /O.CON.KIWX.MA.W.0012.000000T0000Z-260418T0500Z/ 1151 PM EDT Fri Apr 17 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 100 AM 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 1150 PM EDT, strong thunderstorms were located along a line extending from 27 nm northwest of St. Joseph Light to 18 nm north of Burns Harbor to Indiana Harbor, moving southeast at 40 knots. HAZARD...Wind gusts to nearly 50 knots. SOURCE...Radar indicated. 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... A Tornado Watch remains in effect until 300 AM EDT for northwestern Indiana...southwestern Michigan...and the adjacent waters of Lake Michigan. Move to safe harbor until hazardous weather passes. && 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 0350Z 303DEG 39KT 4230 8706 4196 8712 4167 8742 HAIL...0.00IN WIND...49KTS $$ MCS