Great Lakes Forecast
Issued by NWS
Issued by NWS
972 FZUS63 KMQT 041954 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 354 PM 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...A weak 29.9 inch trough currently moving into the are should slide east of Lake Superior late tonight. 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 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 moves 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. LSZ162-050400- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 354 PM EDT Sat May 4 2024 /254 PM CDT Sat May 4 2024/ .LATE THIS AFTERNOON...West winds 5 to 15 knots. A slight chance of rain showers. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots. Patchy fog 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 veering west after midnight, then backing south late. Waves calm to 2 feet. .MONDAY...East winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .MONDAY NIGHT...East winds 15 to 25 knots. A chance of rain showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .TUESDAY...East winds 20 to 30 knots backing northeast by mid afternoon. Rain showers. Waves building to 4 to 7 feet occasionally to 9 feet. .TUESDAY NIGHT...Northeast winds 15 to 25 knots. A chance of rain showers. Waves subsiding to 2 to 4 feet. .WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain showers. Waves 2 to 4 feet. .THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to 20 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet. $$ LSZ263-050400- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 354 PM EDT Sat May 4 2024 .LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. A chance of rain showers. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots. Patchy fog through midnight. Waves calm to 2 feet. .SUNDAY...West winds 5 to 15 knots backing southwest in the afternoon. Waves building to 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less than 10 knots late. Waves subsiding to calm to 2 feet. .MONDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves building to 1 to 3 feet. .MONDAY NIGHT...East winds 10 to 20 knots. Waves 1 to 3 feet. .TUESDAY...East winds 20 to 30 knots. Rain showers. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...East winds 15 to 25 knots backing northeast after midnight. Rain showers likely through midnight. A chance of thunderstorms. A chance of rain showers after midnight. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of rain showers. Waves subsiding to 2 to 4 feet. .THURSDAY...North winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. $$ LSZ264-050400- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 354 PM EDT Sat May 4 2024 .LATE THIS AFTERNOON...North winds 5 to 15 knots. A chance of rain showers. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots becoming west 10 to 20 knots after midnight, then diminishing to 5 to 15 knots late. A slight chance of rain showers through midnight. Patchy fog. 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 subsiding to calm to 2 feet, then building to 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west late. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing southeast 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 20 to 30 knots. A chance of rain showers through early afternoon, then rain showers by mid afternoon. Waves building to 2 to 4 feet. .TUESDAY NIGHT...East winds 15 to 25 knots. Rain showers likely through midnight. A chance of rain showers after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of rain showers. Waves subsiding to 2 to 4 feet. .THURSDAY...North winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. $$ LSZ265-050400- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 354 PM EDT Sat May 4 2024 .LATE THIS AFTERNOON...North winds 10 to 20 knots. Rain showers likely. Waves calm to 2 feet. .TONIGHT...Northwest winds 10 to 20 knots backing west after midnight. A chance of rain showers through midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 10 to 20 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TUESDAY...East winds 15 to 25 knots. A chance of showers through early afternoon, then showers by mid afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .TUESDAY NIGHT...East winds 15 to 25 knots. Rain showers likely through midnight. A chance of thunderstorms. A chance of rain showers after midnight. Waves building to 2 to 4 feet. .WEDNESDAY...North winds 15 to 25 knots veering northeast. A chance of rain showers. Waves 2 to 4 feet. .THURSDAY...North winds 15 to 25 knots. A chance of rain showers. Waves 2 to 4 feet. $$ LSZ266-050400- 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- 354 PM EDT Sat May 4 2024 .LATE THIS AFTERNOON...East winds 10 to 20 knots. A chance of rain showers. Waves 1 to 3 feet. .TONIGHT...Northwest winds 10 to 20 knots. A chance of rain showers through midnight. Patchy fog. Waves subsiding to calm to 2 feet, then building to 3 to 5 feet occasionally to 7 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots in the afternoon. Waves subsiding to 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...Southeast winds 10 to 20 knots. Waves building to 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots. A chance of rain showers through early afternoon, then rain showers likely by mid afternoon. Waves building to 2 to 4 feet. .TUESDAY NIGHT...East winds 15 to 25 knots. Rain showers likely through midnight. A chance of thunderstorms. A chance of rain showers after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain showers. Waves subsiding to 2 to 4 feet. .THURSDAY...North winds 15 to 25 knots. A chance of rain showers. Waves 2 to 4 feet. $$ LSZ267-050400- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 354 PM EDT Sat May 4 2024 .LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A chance of showers. Waves 1 to 3 feet building to 2 to 4 feet. .TONIGHT...Southeast winds 10 to 20 knots veering west after midnight, then becoming northwest 15 to 25 knots late. Patchy fog. Rain showers through midnight. A chance of rain showers and a slight chance of thunderstorms after midnight. Waves subsiding to calm to 2 feet, then building to 2 to 4 feet. .SUNDAY...Northwest winds 10 to 20 knots backing west in the afternoon, then diminishing to 5 to 15 knots late. Waves subsiding to 1 to 3 feet. .SUNDAY NIGHT...West winds 5 to 15 knots backing southwest late. Waves subsiding to calm to 2 feet. .MONDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southeast after midnight. Waves calm to 2 feet. .TUESDAY...Southeast winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. Rain showers likely by mid afternoon. Waves building to 1 to 3 feet. .TUESDAY NIGHT...Southeast winds 20 to 30 knots backing east after midnight. Showers likely and a chance of thunderstorms. Waves building to 2 to 4 feet. .WEDNESDAY...East winds 15 to 25 knots backing northeast. A chance of rain showers. Waves subsiding to 1 to 3 feet. .THURSDAY...North winds 15 to 25 knots. A chance of rain showers. Waves 1 to 3 feet. $$ LSZ261-050400- MAFOR 0421/ Superior West 11700 11600 13610 11600 11500 11510. A chance of rain showers early this evening. Waves 2 feet or less. Superior North Central 11810 11710 11720 12620 13610. A chance of rain showers this evening. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 3 feet Sunday. Superior South Central 11810 11710 11720 13620 11610 11700. A chance of rain showers this evening. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet Sunday. Superior East 11320 11326 11616 11620 12720 11710 11610. Waves 2 to 4 feet. $$ LC Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes