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Great Lakes Forecast
Issued by NWS
Issued by NWS
242 FZUS63 KMQT 010134 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 934 PM EDT Sun Jun 30 2024 For waters beyond 5 nautical miles of shore on Lake Superior. Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS... A sprawling 30.3 inch high pressure is currently over the western Great Lakes region. As the high weakens to 30.2 inches while moving to the Lower Great Lakes by Monday evening, a 29.6 inch low will develop over the Northern Plains. This low will deepen to 29.4 inches while lifting into northern Ontario by Tuesday evening. An associated 29.7 inch trough will sweep across Lake Superior Tuesday night and Wednesday morning. In its wake, a 29.9 inch high pressure ridge will shift east, reaching the western Great Lakes on Thursday. A 29.7 inch low pressure organizing over the Plains on Thursday will then track to the western Great Lakes region on Friday. LSZ162-010945- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 934 PM EDT Sun Jun 30 2024 /834 PM CDT Sun Jun 30 2024/ .REST OF TONIGHT...Southwest winds 5 to 15 knots veering west after midnight, then backing south late. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing east in the afternoon, then increasing to 10 to 20 knots late. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southeast after midnight, then increasing to 15 to 25 knots late. A chance of showers through midnight. A slight chance of thunderstorms. Showers after midnight. Waves building to 2 to 4 feet. .TUESDAY...Southeast winds 10 to 20 knots veering south by mid afternoon. Showers likely and a slight chance of thunderstorms through early afternoon, then a chance of showers by mid afternoon. Waves subsiding to 1 to 3 feet. .TUESDAY NIGHT...Southwest winds 10 to 20 knots veering west after midnight. A chance of showers. Waves subsiding to calm to 2 feet. .WEDNESDAY...West winds 15 to 25 knots. Waves building to 2 to 4 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots becoming northeast 10 to 20 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY...Northeast winds 10 to 20 knots backing northwest. A chance of showers and thunderstorms. Waves calm to 2 feet. $$ LSZ263-010945- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 934 PM EDT Sun Jun 30 2024 .REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then backing southwest late. Waves 1 to 3 feet subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing east late. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight. A slight chance of showers through midnight, then showers and a slight chance of thunderstorms after midnight. Waves building to 2 to 4 feet. .TUESDAY...South winds 15 to 25 knots. Showers and a slight chance of thunderstorms through early afternoon, then a chance of showers by mid afternoon. Waves 2 to 4 feet. .TUESDAY NIGHT...South winds 5 to 15 knots veering southwest after midnight. A chance of showers. Waves subsiding to calm to 2 feet. .WEDNESDAY...West winds 15 to 25 knots. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots backing east. A chance of showers. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots backing north. A chance of showers and thunderstorms. Waves calm to 2 feet. $$ LSZ264-010945- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 934 PM EDT Sun Jun 30 2024 .REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then backing southwest late. Waves 1 to 3 feet subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing southeast late. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. A chance of showers after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...South winds 15 to 25 knots. Showers through early afternoon, then a chance of showers by mid afternoon. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest 5 to 15 knots after midnight. A chance of showers and thunderstorms. Waves subsiding to 1 to 3 feet. .WEDNESDAY...West winds 15 to 25 knots. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .THURSDAY...West winds 5 to 15 knots backing southeast. Waves subsiding to calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots backing north. A chance of showers. Waves calm to 2 feet. $$ LSZ265-010945- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 934 PM EDT Sun Jun 30 2024 .REST OF TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots becoming southeast 10 to 20 knots in the afternoon. Waves building to 1 to 3 feet. .MONDAY NIGHT...Southeast winds 10 to 20 knots becoming south 15 to 25 knots late. A chance of showers after midnight. Waves building to 2 to 4 feet. .TUESDAY...South winds 20 to 30 knots diminishing to 15 to 25 knots by mid afternoon. Showers through early afternoon, then a chance of showers and a slight chance of thunderstorms by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...South winds 10 to 20 knots veering southwest after midnight. A chance of showers and thunderstorms. Waves subsiding to calm to 2 feet. .WEDNESDAY...West winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots veering southeast. A chance of showers. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots becoming north 10 to 20 knots. A chance of showers and thunderstorms. Waves calm to 2 feet. $$ LSZ266-010945- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- 934 PM EDT Sun Jun 30 2024 .REST OF TONIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing southeast late. Waves building to 1 to 3 feet. .MONDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight, then increasing to 15 to 25 knots late. A chance of showers after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...South winds 20 to 30 knots. Showers. A slight chance of thunderstorms by mid afternoon. Waves building to 4 to 7 feet occasionally to 9 feet. .TUESDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Showers likely through midnight. A chance of showers after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...West winds 10 to 20 knots. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .THURSDAY...West winds 5 to 15 knots backing southeast. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 5 to 15 knots becoming north 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ267-010945- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 934 PM EDT Sun Jun 30 2024 .REST OF TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then backing west late. Waves calm to 2 feet. .MONDAY...West winds 5 to 15 knots backing southwest in the afternoon, then backing east late. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight, then backing southeast late. Waves building to 1 to 3 feet. .TUESDAY...South winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. Showers. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Showers. Waves subsiding to 1 to 3 feet. .WEDNESDAY...Southwest winds 10 to 20 knots veering west by mid afternoon. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing east. Waves calm to 2 feet. .FRIDAY...East winds 10 to 20 knots backing northeast. A chance of showers and thunderstorms. Waves calm to 2 feet. $$ LSZ261-010945- MAFOR 0103/ Superior West 12500 12400 11300 12210 11310. Waves 2 feet or less. Superior North Central 11620 12610 12500 12310 11320. Waves 1 to 4 feet. Superior South Central 11610 12600 11500 11300 11310 12320. Waves 2 feet or less overnight and Monday building to 2 to 4 feet Monday evening. Superior East 12710 11600 12500 11400 12310. Waves 1 to 3 feet. $$ BW Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes