Great Lakes Forecast
Issued by NWS
Issued by NWS
256 FZUS63 KMQT 251946 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 346 PM EDT Wed Sep 25 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 30.0 inch high pressure over the Mid-Mississippi Valley this afternoon and evening moves into the western Great Lakes by Thursday morning. High pressure ridging continues over the Great Lakes at 30.0 inches Friday into Saturday despite the remnants of a 29.5 inch tropical system over the Southeast and a 29.8 inch low over Hudson Bay. High pressure ridging builds over the Upper Great Lakes to 30.1 inches Sunday as a 30.2 inch high pressure moves into northern Ontario from the west. The ridging remains until Monday, when a 29.5 inch low lifting towards Hudson Bay brings troughing of at least 29.7 inches back over the Lake Superior. LSZ162-260400- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 346 PM EDT Wed Sep 25 2024 /246 PM CDT Wed Sep 25 2024/ .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots veering northwest after midnight, then veering north late. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots veering southeast in the afternoon, then backing east late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots backing north after midnight, then backing southwest late. Waves calm to 2 feet. .FRIDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...West winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SATURDAY...North winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...East winds 5 to 15 knots increasing to 10 to 20 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 15 to 25 knots veering northwest. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet. $$ LSZ263-260400- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 346 PM EDT Wed Sep 25 2024 .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots becoming north less than 10 knots late. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots backing west in the afternoon, then backing south late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering southwest late. Waves calm to 2 feet. .FRIDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Southwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SATURDAY...North winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...West winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SUNDAY...Northeast winds 5 to 15 knots becoming south 10 to 20 knots. Waves calm to 2 feet. .MONDAY...South winds 15 to 25 knots becoming northwest 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ264-260400- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 346 PM EDT Wed Sep 25 2024 .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots becoming west less than 10 knots late. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots veering south in the afternoon, then backing southeast late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Southwest winds 5 to 15 knots becoming north less than 10 knots after midnight. Waves calm to 2 feet. .SATURDAY...North winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...West winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SUNDAY...Northeast winds 5 to 15 knots veering south. Waves calm to 2 feet. .MONDAY...South winds 10 to 20 knots becoming northwest 15 to 25 knots. A chance of showers. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ265-260400- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 346 PM EDT Wed Sep 25 2024 .LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots backing southwest after midnight. Waves calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing southeast in the afternoon, then backing east late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering southwest late. Waves calm to 2 feet. .FRIDAY...Southwest winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after midnight. Waves calm to 2 feet. .SATURDAY...West winds 5 to 15 knots veering north by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SUNDAY...Northeast winds 10 to 20 knots becoming south 5 to 15 knots. Waves calm to 2 feet. .MONDAY...South winds 10 to 20 knots becoming northwest 15 to 25 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ266-260400- 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- 346 PM EDT Wed Sep 25 2024 .LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots backing southwest after midnight. Waves calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing south in the afternoon, then backing east late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...Southwest winds 5 to 15 knots backing south by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots veering northwest by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SUNDAY...Northeast winds 10 to 20 knots becoming south 5 to 15 knots. Waves calm to 2 feet. .MONDAY...South winds 10 to 20 knots becoming northwest 15 to 25 knots. A chance of showers. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ267-260400- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 346 PM EDT Wed Sep 25 2024 .LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 1 to 3 feet subsiding to calm to 2 feet. .TONIGHT...Northwest winds 10 to 20 knots becoming west 5 to 15 knots after midnight, then backing southwest late. Waves calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots backing south in the afternoon, then backing east late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots veering northwest by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SUNDAY...North winds 10 to 20 knots veering southeast. Waves calm to 2 feet. .MONDAY...South winds 10 to 20 knots becoming west 15 to 25 knots. A chance of showers. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ261-260400- MAFOR 2521/ Superior West 12510 11500 11700 12800 11200 11300. Waves 2 feet or less. Superior North Central 12510 11500 11600 12700 12400. Waves 2 feet or less. Superior South Central 11710 11600 13500 11600 11700 11200. Waves 2 feet or less. Superior East 12710 11600 14500 11400. Waves 2 feet or less. $$ TAP Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes