978 WHUS53 KGRR 050412 SMWGRR LMZ844-878-050545- /O.NEW.KGRR.MA.W.0071.260905T0412Z-260905T0545Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Special Marine Warning National Weather Service Grand Rapids MI 1212 AM EDT Sat Sep 5 2026 The National Weather Service in Grand Rapids has issued a * Special Marine Warning for... Nearshore and Open Waters from St Joseph to South Haven MI... * Until 145 AM EDT. * At 1210 AM EDT, a strong thunderstorm was located 9 nm southwest of South Haven Light, moving east at 20 knots. Additional strong thunderstorms were located at mid lake, roughly 40 miles west of the South Haven Light. These storms were also moving east at 20 knots. HAZARD...Wind gusts to 40 knots and small hail. SOURCE...Radar. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. * Locations impacted include... South Haven Light, St. Joseph Light, and St. Joseph. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects. && LAT...LON 4213 8656 4212 8696 4245 8702 4244 8636 4241 8629 4239 8628 4225 8635 4211 8649 TIME...MOT...LOC 0410Z 291DEG 21KT 4233 8647 HAIL...<.75IN WIND...40KTS $$ DUKE  390 WHUS53 KLOT 050412 SMWLOT LMZ777-050530- /O.NEW.KLOT.MA.W.0080.260905T0412Z-260905T0530Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Special Marine Warning National Weather Service Chicago/Romeoville 1112 PM CDT Fri Sep 4 2026 The National Weather Service in Chicago has issued a * Special Marine Warning for... Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid Lake... * Until 1230 AM CDT. * At 1112 PM CDT, strong thunderstorms were located along a line extending from 26 nm northwest of St. Joseph Light to 11 nm east of Waukegan Harbor, moving east at 25 knots. HAZARD...Wind gusts to 40 knots and small hail. SOURCE...Radar. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. * Strong thunderstorms will remain over mainly open waters. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor until hazardous weather passes. Frequent lightning is occurring with these storms. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects. && LAT...LON 4246 8702 4224 8698 4226 8729 4246 8725 TIME...MOT...LOC 0412Z 279DEG 25KT 4232 8701 4233 8757 HAIL...<.75IN WIND...40KTS $$ Doom  932 FZUS73 KLOT 050414 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1114 PM CDT Fri Sep 4 2026 LMZ740-050423- /O.CAN.KLOT.MA.W.0078.000000T0000Z-260905T0500Z/ 1114 PM CDT Fri Sep 4 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Nearshore Waters from Winthrop Harbor to Wilmette Harbor... The thunderstorm has moved out of the warned area and no longer poses a significant threat to boaters. && LAT...LON 4225 8756 4247 8750 4246 8723 4220 8728 TIME...MOT...LOC 0413Z 275DEG 20KT 4238 8750 $$ LMZ777-050500- /O.CON.KLOT.MA.W.0078.000000T0000Z-260905T0500Z/ 1114 PM CDT Fri Sep 4 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT... For the following areas... Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid Lake... At 1113 PM CDT, a strong thunderstorm was located 14 nm east of Waukegan Harbor, moving east at 20 knots. HAZARD...Wind gusts to 40 knots and small hail. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. The strong thunderstorm will remain over mainly open waters. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor until hazardous weather passes. && LAT...LON 4225 8756 4247 8750 4246 8723 4220 8728 TIME...MOT...LOC 0413Z 275DEG 20KT 4238 8750 HAIL...<.75IN WIND...40KTS $$ Doom  378 FZUS73 KLOT 050416 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1116 PM CDT Fri Sep 4 2026 LMZ740-741-050426- /O.CAN.KLOT.MA.W.0079.000000T0000Z-260905T0500Z/ 1116 PM CDT Fri Sep 4 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Nearshore Waters from Winthrop Harbor to Northerly Island... The thunderstorms have moved out of the warned area and no longer pose a significant threat to boaters. && LAT...LON 4225 8698 4213 8696 4195 8697 4198 8724 4228 8747 TIME...MOT...LOC 0416Z 276DEG 31KT 4219 8702 4210 8725 $$ LMZ777-779-050500- /O.CON.KLOT.MA.W.0079.000000T0000Z-260905T0500Z/ 1116 PM CDT Fri Sep 4 2026 ...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT... For the following areas... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... At 1116 PM CDT, strong thunderstorms were located along a line extending from 23 nm west of St. Joseph Light to 18 nm northeast of Harrison-Dever Crib, moving east at 30 knots. HAZARD...Wind gusts to 40 knots and small hail. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Strong thunderstorms will remain over mainly open waters. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor until hazardous weather passes. Frequent lightning is occurring with these storms. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects. && LAT...LON 4225 8698 4213 8696 4195 8697 4198 8724 4228 8747 TIME...MOT...LOC 0416Z 276DEG 31KT 4219 8702 4210 8725 HAIL...<.75IN WIND...40KTS $$ Doom  713 FZUS74 KLIX 050418 MWSLIX Marine Weather Statement National Weather Service New Orleans LA 1118 PM CDT Fri Sep 4 2026 GMZ541-551-050545- 1118 PM CDT Fri Sep 4 2026 The areas affected include... Terrebonne Bay... Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm... * At 1118 PM CDT, Doppler radar indicated a strong thunderstorm, capable of producing winds to around 30 knots. This strong thunderstorm was located near Terrebonne Bay, moving southwest at 5 knots. Locations impacted include... Terrebonne Bay and Timbalier Island. PRECAUTIONARY/PREPAREDNESS ACTIONS... Report severe weather to the Coast Guard or nearest law enforcement agency. They will relay your report to the National Weather Service office. Mariners can expect gusty winds to around 30 knots, locally higher waves, lightning strikes, and heavy downpours. Boaters should seek safe harbor immediately until this storm passes. && LAT...LON 2906 9078 2908 9080 2920 9057 2909 9044 2891 9059 TIME...MOT...LOC 0417Z 44DEG 3KT 2910 9059 $$ Zeringue  683 WUUS53 KBIS 050435 SVRBIS NDC023-050530- /O.NEW.KBIS.SV.W.0327.260905T0435Z-260905T0530Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Bismarck ND 1135 PM CDT Fri Sep 4 2026 The National Weather Service in Bismarck has issued a * Severe Thunderstorm Warning for... Northwestern Divide County in northwestern North Dakota... * Until 1230 AM CDT. * At 1135 PM CDT, a severe thunderstorm was located near Fortuna, or 24 miles west of Crosby, moving northeast at 20 mph. HAZARD...60 mph wind gusts and half dollar size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. * Locations impacted include... Fortuna, Alkabo and Ambrose. PRECAUTIONARY/PREPAREDNESS ACTIONS... Seek shelter inside a well-built structure and stay away from windows. This storm is capable of producing damaging winds and large hail. && LAT...LON 4877 10372 4882 10394 4900 10390 4900 10335 TIME...MOT...LOC 0435Z 210DEG 17KT 4886 10382 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.25 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Johnson  534 WWUS53 KBIS 050444 SVSBIS Severe Weather Statement National Weather Service Bismarck ND 1144 PM CDT Fri Sep 4 2026 NDC023-050530- /O.CON.KBIS.SV.W.0327.000000T0000Z-260905T0530Z/ Divide ND- 1144 PM CDT Fri Sep 4 2026 ...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR NORTHWESTERN DIVIDE COUNTY... At 1144 PM CDT, a severe thunderstorm was located over Fortuna, or 19 miles west of Crosby, moving northeast at 25 mph. HAZARD...Golf ball size hail and 60 mph wind gusts. SOURCE...Radar indicated. IMPACT...People and animals outdoors will be injured. Expect hail damage to roofs, siding, windows, and vehicles. Expect wind damage to roofs, siding, and trees. Locations impacted include... Fortuna and Ambrose. PRECAUTIONARY/PREPAREDNESS ACTIONS... Anyone outdoors should move to shelter inside a well-built structure and stay away from windows. This storm is capable of producing dangerous hail and damaging winds. && LAT...LON 4878 10371 4883 10388 4900 10382 4900 10335 TIME...MOT...LOC 0435Z 222DEG 21KT 4886 10377 THUNDERSTORM DAMAGE THREAT...CONSIDERABLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Johnson  754 WWUS53 KBIS 050449 SVSBIS Severe Weather Statement National Weather Service Bismarck ND 1149 PM CDT Fri Sep 4 2026 NDC023-050530- /O.CON.KBIS.SV.W.0327.000000T0000Z-260905T0530Z/ Divide ND- 1149 PM CDT Fri Sep 4 2026 ...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR NORTHWESTERN DIVIDE COUNTY... At 1149 PM CDT, a severe thunderstorm was located near Fortuna, or 18 miles west of Crosby, moving northeast at 25 mph. HAZARD...Two inch hail and 60 mph wind gusts. SOURCE...Radar indicated. IMPACT...People and animals outdoors will be injured. Expect hail damage to roofs, siding, windows, and vehicles. Expect wind damage to roofs, siding, and trees. Locations impacted include... Fortuna and Ambrose. PRECAUTIONARY/PREPAREDNESS ACTIONS... Anyone outdoors should move to shelter inside a well-built structure and stay away from windows. This storm is capable of producing dangerous hail and damaging winds. && LAT...LON 4879 10369 4884 10384 4900 10382 4900 10335 TIME...MOT...LOC 0444Z 223DEG 21KT 4888 10372 THUNDERSTORM DAMAGE THREAT...CONSIDERABLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...2.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Johnson  612 FZUS73 KLOT 050449 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1149 PM CDT Fri Sep 4 2026 LMZ777-050459- /O.CAN.KLOT.MA.W.0078.000000T0000Z-260905T0500Z/ 1149 PM CDT Fri Sep 4 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid Lake... The thunderstorm has moved out of the area and no longer poses a significant threat to boaters. && LAT...LON 4225 8756 4247 8750 4246 8723 4220 8728 TIME...MOT...LOC 0448Z 275DEG 20KT 4236 8723 $$ Doom  825 FZUS73 KLOT 050450 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1150 PM CDT Fri Sep 4 2026 LMZ777-779-050500- /O.EXP.KLOT.MA.W.0079.000000T0000Z-260905T0500Z/ 1150 PM CDT Fri Sep 4 2026 ...THE SPECIAL MARINE WARNING WILL EXPIRE AT 1200 AM CDT... The affected areas were... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... The thunderstorms have moved out of the area and no longer pose a significant threat to boaters. && LAT...LON 4225 8698 4213 8696 4195 8697 4198 8724 4228 8747 TIME...MOT...LOC 0450Z 276DEG 31KT 4216 8665 4207 8688 $$ Doom  537 FZUS73 KLOT 050454 MWSLOT Marine Weather Statement National Weather Service Chicago/Romeoville 1154 PM CDT Fri Sep 4 2026 LMZ777-050500- /O.CAN.KLOT.MA.W.0080.000000T0000Z-260905T0530Z/ 1154 PM CDT Fri Sep 4 2026 ...THE SPECIAL MARINE WARNING IS CANCELLED... The affected areas were... Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid Lake... The thunderstorms have moved out of the area and no longer pose a significant threat to boaters. && LAT...LON 4246 8702 4224 8698 4226 8729 4246 8725 TIME...MOT...LOC 0448Z 279DEG 25KT 4228 8668 4229 8724 $$ Doom  371 WWUS53 KBIS 050454 SVSBIS Severe Weather Statement National Weather Service Bismarck ND 1154 PM CDT Fri Sep 4 2026 NDC023-050530- /O.CON.KBIS.SV.W.0327.000000T0000Z-260905T0530Z/ Divide ND- 1154 PM CDT Fri Sep 4 2026 ...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR NORTHWESTERN DIVIDE COUNTY... At 1154 PM CDT, a severe thunderstorm was located 5 miles east of Fortuna, or 17 miles west of Crosby, moving northeast at 25 mph. HAZARD...Ping pong ball size hail and 60 mph wind gusts. SOURCE...Radar indicated. IMPACT...People and animals outdoors will be injured. Expect hail damage to roofs, siding, windows, and vehicles. Expect wind damage to roofs, siding, and trees. Locations impacted include... Fortuna and Ambrose. PRECAUTIONARY/PREPAREDNESS ACTIONS... Seek shelter inside a well-built structure and stay away from windows. This storm is capable of producing damaging winds and large hail. && LAT...LON 4881 10366 4886 10381 4900 10378 4900 10335 TIME...MOT...LOC 0449Z 222DEG 21KT 4891 10370 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.50 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Johnson