Great Lakes Forecast
Issued by NWS
Issued by NWS
063 FZUS63 KMQT 041401 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1001 AM EDT Sat May 4 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...Weak ridging of 30.0 inches holds across eastern Lake Superior this morning before a weak 29.9 inch trough moves into the Upper Great Lakes this evening. Ridging at 30.1 inches returns across the lake on Sunday. Ridging shifts east early next week as a broad 29.2 inch low pressure develops on the Northern Plains on Monday. A strong pressure gradient over western Lake Superior begins to setup Tuesday morning as a deepening 29.0 inch low pushes eastward against 30.0 inch ridging over far northern Ontario. A secondary 29.4 inch low pressure moves into southern Lake Superior Wednesday morning. LSZ162-042200- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1001 AM EDT Sat May 4 2024 /901 AM CDT Sat May 4 2024/ .REST OF TODAY...Northwest winds 5 to 15 knots veering north in the afternoon, then backing northwest late. Rain showers likely. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots late. A slight chance of rain showers through midnight. Waves calm to 2 feet. .SUNDAY...West winds 5 to 15 knots backing southwest in the afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 5 to 15 knots backing east after midnight. Waves calm to 2 feet. .MONDAY...East winds 10 to 20 knots becoming northeast 15 to 25 knots by mid afternoon. Waves building to 4 to 7 feet occasionally to 9 feet. .MONDAY NIGHT...East winds 15 to 25 knots. A chance of rain showers after midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .TUESDAY...East winds 15 to 25 knots backing northeast. Rain showers. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to 25 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. $$ LSZ263-042200- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1001 AM EDT Sat May 4 2024 .REST OF TODAY...North winds 5 to 15 knots. A chance of rain showers. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots backing west after midnight. A slight chance of rain showers through midnight. Waves calm to 2 feet. .SUNDAY...West winds 5 to 15 knots backing southwest late. Waves building to 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots backing south after midnight. Waves subsiding to calm to 2 feet. .MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves building to 2 to 4 feet. .MONDAY NIGHT...East winds 10 to 20 knots. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...East winds 15 to 25 knots. Rain showers. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. $$ LSZ264-042200- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1001 AM EDT Sat May 4 2024 .REST OF TODAY...West winds less than 10 knots becoming northeast 5 to 15 knots in the afternoon, then backing north late. A chance of rain showers. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots increasing to 10 to 20 knots after midnight, then diminishing to 5 to 15 knots late. A chance of rain showers through midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SUNDAY...West winds 5 to 15 knots backing southwest late. Waves 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southeast after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...East winds 15 to 25 knots. A chance of rain showers, then rain showers likely. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. $$ LSZ265-042200- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1001 AM EDT Sat May 4 2024 .REST OF TODAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots in the afternoon, then backing north late. A chance of rain showers by mid afternoon. Waves calm to 2 feet. .TONIGHT...Northwest winds 10 to 20 knots becoming west 15 to 25 knots after midnight, then diminishing to 10 to 20 knots late. A chance of rain showers through midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots late. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 10 to 20 knots. Waves building to 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots. Showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to 25 knots. A chance of rain showers. Waves 1 to 3 feet. $$ LSZ266-042200- 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- 1001 AM EDT Sat May 4 2024 .REST OF TODAY...Southeast winds 10 to 20 knots. A chance of rain showers by mid afternoon. Waves calm to 2 feet building to 1 to 3 feet. .TONIGHT...Northwest winds 10 to 20 knots increasing to 15 to 25 knots after midnight. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet. .SUNDAY...Northwest winds 10 to 20 knots backing west in the afternoon, then diminishing to 5 to 15 knots late. Waves subsiding to 1 to 3 feet. .SUNDAY NIGHT...West winds 5 to 15 knots backing southwest after midnight. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southeast after midnight. Waves building to 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots. Rain showers likely. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet. $$ LSZ267-042200- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1001 AM EDT Sat May 4 2024 .REST OF TODAY...Southeast winds 10 to 20 knots. A chance of rain showers by mid afternoon. Waves calm to 2 feet building to 1 to 3 feet. .TONIGHT...Southeast winds 10 to 20 knots becoming west 15 to 25 knots after midnight. Rain showers likely through midnight. A slight chance of thunderstorms. A chance of rain showers after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots in the afternoon. Waves subsiding to 1 to 3 feet. .SUNDAY NIGHT...West winds 10 to 20 knots becoming southwest 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southeast after midnight. Waves building to 1 to 3 feet. .TUESDAY...Southeast winds 15 to 25 knots backing east. Rain showers likely. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...East winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ261-042200- MAFOR 0415/ Superior West 12816 11700 11600 14610. Waves 1 to 2 feet. Superior North Central 12100 11800 11810 12720 12710. A chance of showers this afternoon. A chance of rain showers this evening. Waves 1 to 3 feet. Superior South Central 11310 11210 11110 12720 11730 12620. A chance of showers this afternoon. A chance of rain showers this evening. Waves 1 foot or less this afternoon. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet Sunday morning. Superior East 11310 12320 11326 11626 11630 11730 11720. Waves 1 to 3 feet this afternoon. Waves 2 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet Sunday morning. $$ Voss Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes