Great Lakes Forecast
Issued by NWS
Issued by NWS
834 FZUS63 KMQT 260143 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 943 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...29.9 inch ridging over the Great Lakes tonight increases to 30.0 inches by Thursday morning as the parent high pressure builds into the region. 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 on Sunday as a 30.2 inch high pressure moves west to east through northern Ontario. The ridging diminishes by Monday as a 29.5 inch low lifting towards Hudson Bay brings troughing of at least 29.7 inches back over Lake Superior. Behind this, a 30.2 inch high pressure from the Northern Rockies drops into the Central Plains and brings ridging of 30.0 inches back over Lake Superior by Tuesday. LSZ162-260945- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 943 PM EDT Wed Sep 25 2024 /843 PM CDT Wed Sep 25 2024/ .REST OF TONIGHT...West winds 5 to 15 knots veering northwest after midnight. Waves calm to 2 feet. .THURSDAY...North 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. $$ LSZ263-260945- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 943 PM EDT Wed Sep 25 2024 .REST OF TONIGHT...Southwest winds 5 to 15 knots veering west after midnight. Waves calm to 2 feet. .THURSDAY...North winds less than 10 knots backing west in the afternoon, then backing south late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering southwest late. Waves calm to 2 feet. .FRIDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Southwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SATURDAY...North winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...West winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SUNDAY...Northeast winds 5 to 15 knots becoming south 10 to 20 knots. Waves calm to 2 feet. .MONDAY...South winds 15 to 25 knots becoming northwest 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ264-260945- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 943 PM EDT Wed Sep 25 2024 .REST OF TONIGHT...Southwest winds 5 to 15 knots veering west after midnight, then diminishing to less than 10 knots late. Waves calm to 2 feet. .THURSDAY...North winds less than 10 knots backing west in the afternoon, then backing south 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. $$ LSZ265-260945- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 943 PM EDT Wed Sep 25 2024 .REST OF TONIGHT...Southwest winds 5 to 15 knots veering west late. Waves calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing east late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering southwest late. Waves calm to 2 feet. .FRIDAY...Southwest winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after midnight. Waves calm to 2 feet. .SATURDAY...West winds 5 to 15 knots veering north by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SUNDAY...Northeast winds 10 to 20 knots becoming south 5 to 15 knots. Waves calm to 2 feet. .MONDAY...South winds 10 to 20 knots becoming northwest 15 to 25 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ266-260945- 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- 943 PM EDT Wed Sep 25 2024 .REST OF TONIGHT...West winds 5 to 15 knots backing southwest after midnight. 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...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. $$ LSZ267-260945- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 943 PM EDT Wed Sep 25 2024 .REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then backing southwest late. Waves calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots backing south in the afternoon, then backing east late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots veering northwest by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .SUNDAY...North winds 10 to 20 knots veering southeast. Waves calm to 2 feet. .MONDAY...South winds 10 to 20 knots becoming west 15 to 25 knots. A chance of showers. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ261-260945- MAFOR 2603/ Superior West 11600 13700 11800 11300 11200 11300. Waves 1 foot or less. Superior North Central 11510 12600 12700 11400 12300. Waves 2 feet or less. Superior South Central 13500 11600 11700 11800 11200 11300. Waves 1 foot or less. Superior East 11600 13500 12400 11200 11300. 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