Great Lakes Forecast
Issued by NWS
Issued by NWS
648 FZUS63 KMQT 060145 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 945 PM EDT Sun May 5 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 30.1 inch ridge over the Great Lakes today shifts east Monday as a broad 29.2 inch low pressure develops on the Northern Plains. A strong pressure gradient over western Lake Superior begins to set up Tuesday morning as a deepening 29.0 inch low pushes eastward against 30.0 inch ridging over far northern Ontario. This gradient loosens into Wednesday as the Northern Plains low weakens and a 29.5 and a 29.4 inch low ejecting out of the Plains move south of Lake Superior. After a brief window of height rises late in the day Wednesday, another 29.4 inch low moves from the Central Plains into the Lower Great Lakes early Thursday. Weak 30.0 inch ridging briefly builds in Thursday night through early Friday before another 29.7 inch low pressure trough drops through later in the day. LSZ162-060945- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 945 PM EDT Sun May 5 2024 /845 PM CDT Sun May 5 2024/ .REST OF TONIGHT...South winds 5 to 15 knots backing east after midnight, then backing northeast late. Waves calm to 2 feet. .MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots late. Waves building to 3 to 5 feet occasionally to 7 feet. .MONDAY NIGHT...East winds 10 to 20 knots. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...East winds 20 to 30 knots with a few gale force gusts to 35 knots. Rain showers. A slight chance of thunderstorms by mid afternoon. Waves building to 5 to 8 feet occasionally to 10 feet. .TUESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Rain showers likely through midnight, then a chance of rain showers after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...Northeast winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY NIGHT...Northeast winds 20 to 30 knots. A chance of rain showers. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .THURSDAY...Northeast winds 15 to 25 knots becoming northwest 10 to 20 knots. Waves subsiding to 1 to 3 feet. .FRIDAY...Southwest winds 10 to 20 knots veering northwest. Waves subsiding to calm to 2 feet. $$ LSZ263-060945- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 945 PM EDT Sun May 5 2024 .REST OF TONIGHT...Southwest winds 5 to 15 knots backing south after midnight. Waves 1 to 3 feet subsiding to calm to 2 feet. .MONDAY...Southeast winds less than 10 knots becoming east 5 to 15 knots in the afternoon. Waves building to 1 to 3 feet. .MONDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight, then backing east late. Waves 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots. A chance of rain showers through early afternoon, then rain showers by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...East winds 10 to 20 knots backing northeast after midnight. Rain showers likely through midnight, then a chance of rain showers after midnight. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain showers. Waves 2 to 4 feet. .WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet. .THURSDAY...Northeast winds 15 to 25 knots becoming north 5 to 15 knots. Waves subsiding to 2 to 4 feet. .FRIDAY...West winds 5 to 15 knots. Waves subsiding to 1 to 3 feet. $$ LSZ264-060945- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 945 PM EDT Sun May 5 2024 .REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves 1 to 3 feet subsiding to calm to 2 feet. .MONDAY...Southwest winds less than 10 knots becoming southeast 5 to 15 knots in the afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves building to 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...East winds 5 to 15 knots becoming northeast 10 to 20 knots after midnight. Rain showers likely through midnight, then a chance of rain showers after midnight. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain showers. Waves 2 to 4 feet. .WEDNESDAY NIGHT...Northeast winds 10 to 20 knots. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet. .THURSDAY...North winds 10 to 20 knots. Waves subsiding to 2 to 4 feet. .FRIDAY...West winds 5 to 15 knots veering northwest. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. $$ LSZ265-060945- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 945 PM EDT Sun May 5 2024 .REST OF TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing east in the afternoon, then increasing to 10 to 20 knots late. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight, then diminishing to 5 to 15 knots late. Waves calm to 2 feet. .TUESDAY...East winds 10 to 20 knots. A slight chance of showers through early afternoon, then showers likely by mid afternoon. Waves building to 2 to 4 feet. .TUESDAY NIGHT...East winds 5 to 15 knots backing northeast after midnight. Rain showers likely through midnight, then a chance of rain showers after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain showers. Waves building to 1 to 3 feet. .WEDNESDAY NIGHT...Northeast winds 10 to 20 knots increasing to 15 to 25 knots after midnight. A chance of rain showers. Waves building to 2 to 4 feet. .THURSDAY...North winds 15 to 25 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .FRIDAY...Northwest winds 10 to 20 knots backing west. Waves subsiding to calm to 2 feet. $$ LSZ266-060945- 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- 945 PM EDT Sun May 5 2024 .REST OF TONIGHT...South winds 5 to 15 knots veering southwest after midnight, then backing south late. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing east late. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .TUESDAY...East winds 10 to 20 knots. A chance of rain showers by mid afternoon. Waves building to 2 to 4 feet. .TUESDAY NIGHT...East winds 5 to 15 knots backing northeast after midnight. Rain showers likely through midnight, then a chance of rain showers after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...Northeast winds 10 to 20 knots backing north by mid afternoon. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...Northeast winds 10 to 20 knots increasing to 15 to 25 knots after midnight. A chance of rain showers. Waves building to 2 to 4 feet. .THURSDAY...North winds 15 to 25 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .FRIDAY...Northwest winds 10 to 20 knots. Waves subsiding to 2 to 4 feet. $$ LSZ267-060945- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 945 PM EDT Sun May 5 2024 .REST OF TONIGHT...Southwest winds 5 to 15 knots backing southeast late. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing east in the afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .TUESDAY...East winds 10 to 20 knots. Waves building to 1 to 3 feet. .TUESDAY NIGHT...Southeast winds 10 to 20 knots backing northeast after midnight. Rain showers likely through midnight, then a chance of rain showers after midnight. Waves 1 to 3 feet. .WEDNESDAY...Northeast winds 10 to 20 knots backing north by mid afternoon. A chance of rain showers. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...Northeast winds 10 to 20 knots increasing to 15 to 25 knots after midnight. A chance of rain showers. Waves building to 2 to 4 feet. .THURSDAY...North winds 15 to 25 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .FRIDAY...Northwest winds 10 to 20 knots. Waves 2 to 4 feet. $$ LSZ261-060945- MAFOR 0603/ Superior West 11300 12200 11300 11200 11210 12220. Waves 2 feet or less overnight and Monday. Waves 2 to 4 feet Monday evening. Superior North Central 11510 13500 11400 13310. Waves 1 to 3 feet overnight. Waves 2 feet or less Monday and Monday evening. Superior South Central 14400 11300 12210 11310. Waves 2 feet or less. Superior East 11500 14400 13200. Waves 2 feet or less. $$ LC Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes