Great Lakes Forecast
Issued by NWS
Issued by NWS
347 FZUS63 KMQT 302059 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 359 PM EST Tue Dec 30 2025 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 low of 28.7 inches retrogrades from eastern Quebec toward Hudson Bay through tonight as it strengthens to 28.3 inches. Meanwhile a 30.7 inch ridge will build from the Canadian Prairies into the upper Mississippi Valley Wednesday into Thursday while weakening to 30.2 inches. This configuration will persist into Friday. LSZ162-310900- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 359 PM EST Tue Dec 30 2025 /259 PM CST Tue Dec 30 2025/ .LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Snow showers. Waves calm to 2 feet. .TONIGHT...North winds 10 to 20 knots backing northwest by midnight, then increasing to 15 to 25 knots late. A chance of snow showers. Waves building to 1 to 3 feet. .WEDNESDAY...Northwest winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. A slight chance of snow showers in the morning. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots by midnight. Waves subsiding to 2 to 4 feet. .THURSDAY...West winds 15 to 25 knots. A chance of snow showers. Waves 2 to 4 feet. .THURSDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .FRIDAY...Northwest winds 15 to 25 knots backing west in the afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .SATURDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots. A chance of snow showers. Waves calm to 2 feet. Note, wave height forecasts are for ice free areas. $$ LSZ263-310900- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 359 PM EST Tue Dec 30 2025 ...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY EVENING... .LATE THIS AFTERNOON...North winds 5 to 15 knots. Snow showers likely. Waves calm to 2 feet. .TONIGHT...North winds 10 to 20 knots becoming northwest 15 to 25 knots late. A chance of snow showers. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY...Northwest winds 20 to 30 knots. A chance of snow showers in the morning. Heavy freezing spray. Waves building to 5 to 8 feet occasionally to 10 feet. .WEDNESDAY NIGHT...Northwest winds to 30 knots with a few gale force gusts to 35 knots possible diminishing to 20 to 30 knots by midnight. Heavy freezing spray. Waves subsiding to 4 to 8 feet occasionally to 10 feet. .THURSDAY...West winds 20 to 30 knots. Heavy freezing spray. A chance of snow showers in the afternoon. Waves 5 to 8 feet occasionally to 10 feet. .THURSDAY NIGHT...West winds 20 to 30 knots veering northwest after midnight. Freezing spray. Waves subsiding to 4 to 7 feet occasionally to 9 feet. .FRIDAY...Northwest winds 20 to 30 knots. Heavy freezing spray in the morning. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...Northwest winds 20 to 30 knots diminishing to 10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet. .SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. .SUNDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. Note, wave height forecasts are for ice free areas. $$ LSZ264-310900- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 359 PM EST Tue Dec 30 2025 ...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY EVENING... ...GALE WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY EVENING... .LATE THIS AFTERNOON...North winds 10 to 20 knots. A chance of snow showers. Waves 2 to 4 feet. .TONIGHT...North winds 10 to 20 knots increasing to 15 to 25 knots by midnight, then becoming northwest 20 to 30 knots late. A chance of snow showers. Heavy freezing spray after midnight. Waves building to 4 to 7 feet occasionally to 9 feet. .WEDNESDAY...Northwest winds 20 to 30 knots increasing to gales to 35 knots. Heavy freezing spray. A slight chance of snow showers. Waves building to 8 to 11 feet occasionally to 14 feet. .WEDNESDAY NIGHT...Northwest gales to 35 knots. Heavy freezing spray. Waves subsiding to 7 to 10 feet occasionally to 13 feet, then building to 8 to 11 feet occasionally to 14 feet. .THURSDAY...Northwest gales to 35 knots becoming west 20 to 30 knots in the afternoon. Heavy freezing spray. A chance of snow showers in the afternoon. Waves subsiding to 6 to 9 feet occasionally to 11 feet. .THURSDAY NIGHT...West winds 20 to 30 knots veering northwest after midnight. Heavy freezing spray. Waves subsiding to 5 to 8 feet occasionally to 10 feet, then building to 6 to 9 feet occasionally to 11 feet. .FRIDAY...Northwest gales to 35 knots. Heavy freezing spray. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .FRIDAY NIGHT...Northwest gales to 35 knots diminishing to 15 to 25 knots after midnight. Heavy freezing spray in the evening. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. .SUNDAY...Northwest winds 5 to 15 knots. Waves building to 1 to 3 feet. Note, wave height forecasts are for ice free areas. $$ LSZ265-310900- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 359 PM EST Tue Dec 30 2025 ...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY EVENING... ...GALE WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY EVENING... .LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Snow showers likely. Waves 2 to 4 feet. .TONIGHT...Northwest winds 15 to 25 knots increasing to 20 to 30 knots late. Snow showers likely in the evening, then a chance of snow showers after midnight. Freezing spray after midnight. Waves building to 4 to 7 feet occasionally to 9 feet. .WEDNESDAY...Northwest gales to 40 knots. Heavy freezing spray. A chance of snow showers. Waves building to 9 to 12 feet occasionally to 15 feet. .WEDNESDAY NIGHT...Northwest gales to 40 knots. A slight chance of snow showers in the evening. Heavy freezing spray. Waves subsiding to 8 to 11 feet occasionally to 14 feet. .THURSDAY...Northwest gales to 40 knots becoming west gales to 35 knots in the afternoon. Heavy freezing spray. A chance of snow showers in the afternoon. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .THURSDAY NIGHT...West gales to 35 knots veering northwest after midnight. Heavy freezing spray. A chance of snow showers. Waves building to 6 to 9 feet occasionally to 11 feet. .FRIDAY...Northwest gales to 40 knots. Heavy freezing spray. Waves 6 to 9 feet occasionally to 11 feet. .FRIDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to 30 knots after midnight. Freezing spray in the evening. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .SATURDAY...Northwest winds 15 to 25 knots. Waves subsiding to calm to 2 feet. .SUNDAY...West winds 10 to 20 knots increasing to 15 to 25 knots. A chance of snow showers. Waves calm to 2 feet. Note, wave height forecasts are for ice free areas. $$ LSZ266-310900- 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- 359 PM EST Tue Dec 30 2025 ...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY EVENING... ...GALE WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY EVENING... .LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Freezing spray. A chance of snow showers. Waves 4 to 7 feet occasionally to 9 feet. .TONIGHT...Northwest winds 15 to 25 knots increasing to 20 to 30 knots by midnight. Freezing spray. Snow showers likely. Waves building to 5 to 8 feet occasionally to 10 feet. .WEDNESDAY...Northwest gales to 40 knots. Heavy freezing spray. Snow showers likely in the morning. A chance of snow showers in the afternoon. Waves building to 12 to 17 feet occasionally to 21 feet. .WEDNESDAY NIGHT...Northwest gales to 40 knots. Heavy freezing spray. Snow showers likely in the evening. A chance of snow showers after midnight. Waves subsiding to 11 to 15 feet occasionally to 19 feet. .THURSDAY...Northwest gales to 35 knots backing west in the afternoon. Heavy freezing spray. A chance of snow showers. Waves subsiding to 10 to 14 feet occasionally to 18 feet. .THURSDAY NIGHT...West gales to 35 knots veering northwest after midnight. Freezing spray. A chance of snow showers. Waves subsiding to 8 to 11 feet occasionally to 14 feet. .FRIDAY...Northwest gales to 35 knots. Heavy freezing spray. A chance of snow showers. Waves building to 9 to 12 feet occasionally to 15 feet. .FRIDAY NIGHT...Northwest gales to 35 knots diminishing to 15 to 25 knots after midnight. Freezing spray. A chance of snow showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .SATURDAY...Northwest winds 15 to 25 knots. A chance of snow showers. Waves subsiding to 2 to 4 feet. .SUNDAY...West winds 15 to 25 knots. A chance of snow showers. Waves 2 to 4 feet. Note, wave height forecasts are for ice free areas. $$ LSZ267-310900- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 359 PM EST Tue Dec 30 2025 ...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY EVENING... ...GALE WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY EVENING... .LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Freezing spray. A chance of snow showers. Waves 4 to 7 feet occasionally to 9 feet. .TONIGHT...Northwest winds 20 to 30 knots. Freezing spray. A chance of snow showers. Waves building to 5 to 8 feet occasionally to 10 feet. .WEDNESDAY...Northwest gales to 35 knots. Heavy freezing spray. Snow showers likely. Waves building to 11 to 15 feet occasionally to 19 feet. .WEDNESDAY NIGHT...Northwest gales to 40 knots. Heavy freezing spray. Snow showers likely in the evening. A chance of snow showers after midnight. Waves building to 12 to 17 feet occasionally to 21 feet, then subsiding to 11 to 15 feet occasionally to 19 feet. .THURSDAY...Northwest gales to 35 knots backing west in the afternoon. Heavy freezing spray. A chance of snow showers in the morning. Snow showers likely in the afternoon. Waves subsiding to 10 to 14 feet occasionally to 18 feet. .THURSDAY NIGHT...West gales to 35 knots veering northwest after midnight. Freezing spray. Snow showers likely in the evening. A chance of snow showers after midnight. Waves subsiding to 9 to 12 feet occasionally to 15 feet. .FRIDAY...Northwest gales to 35 knots. Freezing spray. A chance of snow showers in the morning. Snow showers likely in the afternoon. Waves 9 to 12 feet occasionally to 15 feet. .FRIDAY NIGHT...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Freezing spray. Snow showers likely in the evening. A chance of snow showers after midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .SATURDAY...Northwest winds 15 to 25 knots. A chance of snow showers. Waves subsiding to 2 to 4 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 15 to 25 knots. A chance of snow showers. Waves 2 to 4 feet. Note, wave height forecasts are for ice free areas. $$ LSZ261-310300- MAFOR 3022/ Superior West...HEAVY FREEZING SPRAY WARNING IN EFFECT...11717 11810 12720 14730. Waves 1 to 3 feet tonight. Waves 2 to 4 feet building to 3 to 6 feet Wednesday. Superior North Central...GALE WARNING IN EFFECT...HEAVY FREEZING SPRAY WARNING IN EFFECT...11720 12830 11740 12742 12752. A chance of snow showers tonight. Waves 2 to 4 feet building to 5 to 7 feet tonight. Waves 6 to 10 feet building to 8 to 11 feet Wednesday. Superior South Central...GALE WARNING IN EFFECT...HEAVY FREEZING SPRAY WARNING IN EFFECT...13737 11747 11740 11742 12752. Waves 3 to 6 feet building to 4 to 7 feet tonight. Waves 6 to 9 feet building to 10 to 14 feet Wednesday. Superior East...GALE WARNING IN EFFECT...HEAVY FREEZING SPRAY WARNING IN EFFECT...13730 12740 12747 11757. Waves 4 to 7 feet tonight. Waves 5 to 8 feet building to 9 to 12 feet Wednesday. $$ WFO MQT Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes