Great Lakes Forecast
Issued by NWS
Issued by NWS
450 FZUS63 KMQT 050245 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 945 PM EST Wed Dec 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 30.7 inch high pressure over the Saskatchewan/North Dakota border this evening builds into the Dakotas tonight. This high then slides south along the Mississippi Valley through mid- week to the Southeast U.S. by Friday as it weakens to 30.4 inches. On Friday, a weak 30.0 inch low passes over Lake Superior. This low is subsequently followed by a 29.4 inch low sweeping southeast into the lake by Saturday evening, which is then followed by another 29.5 inch low over the Upper Great Lakes Sunday night through Monday. LSZ162-051045- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 945 PM EST Wed Dec 4 2024 /845 PM CST Wed Dec 4 2024/ ...STORM WARNING IN EFFECT UNTIL 4 AM EST /3 AM CST/ THURSDAY... ...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 7 AM EST /6 AM CST/ THURSDAY... ...GALE WARNING IN EFFECT FROM 4 AM EST /3 AM CST/ THURSDAY THROUGH THURSDAY MORNING... .REST OF TONIGHT...North storm force winds to 50 knots becoming gales to 40 late. Isolated snow showers late in the evening. Heavy freezing spray. Waves 10 to 14 feet occasionally to 18 feet subsiding to 9 to 12 feet occasionally to 15 feet, then building to 10 to 14 feet occasionally to 18 feet. .THURSDAY...North gales to 35 knots becoming northwest 15 to 25 knots. Freezing spray in the morning. Waves subsiding to 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...West winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon. A chance of snow showers. Waves subsiding to calm to 2 feet. .FRIDAY NIGHT...West winds 5 to 15 knots backing southwest after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .SATURDAY NIGHT...Southwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet. .SUNDAY...Southwest winds 10 to 20 knots backing northeast. A chance of rain showers. A chance of snow showers. Waves subsiding to calm to 2 feet, then building to 2 to 4 feet. .MONDAY...North winds 15 to 25 knots. Snow showers likely, then a chance of snow showers. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. Note, wave height forecasts are for ice free areas. $$ LSZ263-051045- 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 EST Wed Dec 4 2024 ...STORM WARNING IN EFFECT UNTIL 4 AM EST THURSDAY... ...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 7 AM EST THURSDAY... ...GALE WARNING IN EFFECT FROM 4 AM EST THURSDAY THROUGH THURSDAY MORNING... .REST OF TONIGHT...North storm force winds to 50 knots diminishing to gales to 45 knots late. Heavy freezing spray. Scattered snow showers. Waves 10 to 14 feet occasionally to 18 feet building to 12 to 17 feet occasionally to 21 feet. .THURSDAY...North gales to 40 knots diminishing to 20 to 30 knots by late morning, then becoming northwest 15 to 25 knots by mid afternoon. Freezing spray in the morning. A slight chance of snow showers in the morning. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .THURSDAY NIGHT...Northwest winds 10 to 20 knots backing west by midnight. A slight chance of snow showers after midnight. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .FRIDAY...West winds 10 to 20 knots becoming northwest 5 to 15 knots in the afternoon. A chance of snow showers. Waves subsiding to 1 to 3 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southwest after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .SATURDAY NIGHT...Southwest winds 15 to 25 knots veering west after midnight. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...West winds 10 to 20 knots becoming east 15 to 25 knots. A chance of rain showers. A chance of snow showers. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet. .MONDAY...North winds 15 to 25 knots. A chance of rain showers. A chance of snow showers. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet. Note, wave height forecasts are for ice free areas. $$ LSZ264-051045- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 945 PM EST Wed Dec 4 2024 ...STORM WARNING IN EFFECT UNTIL 7 AM EST THURSDAY... ...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 7 AM EST THURSDAY... ...GALE WARNING IN EFFECT FROM 7 AM EST THURSDAY THROUGH THURSDAY AFTERNOON... .REST OF TONIGHT...North gales to 45 knots increasing to storm force winds to 50 knots by midnight. Heavy freezing spray. Numerous snow showers late in the evening. Scattered snow showers after midnight. Waves 10 to 14 feet occasionally to 18 feet building to 15 to 20 feet occasionally to 25 feet. .THURSDAY...North gales to 45 knots becoming northwest 15 to 25 knots by mid afternoon. A slight chance of snow showers in the morning. Freezing spray. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .THURSDAY NIGHT...Northwest winds 10 to 20 knots. A slight chance of snow showers after midnight. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .FRIDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon. A chance of snow showers. Waves subsiding to 1 to 3 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. A chance of snow showers. Waves building to 3 to 5 feet occasionally to 7 feet. .SATURDAY NIGHT...Southwest winds 15 to 25 knots veering west after midnight. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...West winds 10 to 20 knots backing east. A chance of rain showers, possibly mixed with snow. Waves subsiding to 1 to 3 feet, then building to 3 to 6 feet occasionally to 8 feet. .MONDAY...Northeast winds 15 to 25 knots backing north. A chance of rain and snow showers. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. Note, wave height forecasts are for ice free areas. $$ LSZ265-051045- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 945 PM EST Wed Dec 4 2024 ...STORM WARNING IN EFFECT UNTIL 7 AM EST THURSDAY... ...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 7 AM EST THURSDAY... ...GALE WARNING IN EFFECT FROM 7 AM EST THURSDAY THROUGH THURSDAY AFTERNOON... .REST OF TONIGHT...Northwest gales to 45 knots becoming north storm force winds to 50 knots by midnight. Heavy freezing spray. Snow showers. Waves 9 to 12 feet occasionally to 15 feet building to 17 to 22 feet occasionally to 28 feet. .THURSDAY...North gales to 45 knots becoming northwest 20 to 30 knots by mid afternoon. Freezing spray. A chance of snow showers. Waves subsiding to 7 to 10 feet occasionally to 13 feet. .THURSDAY NIGHT...Northwest winds 15 to 25 knots backing west late. A slight chance of snow showers. Waves subsiding to 2 to 4 feet. .FRIDAY...West winds 15 to 25 knots veering northwest in the afternoon. A chance of snow showers. Waves subsiding to 1 to 3 feet. .FRIDAY NIGHT...Northwest winds 10 to 20 knots backing west after midnight. A chance of snow showers. Waves subsiding to calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. A chance of snow showers. Waves calm to 2 feet. .SATURDAY NIGHT...Southwest winds 15 to 25 knots veering west after midnight. Waves calm to 2 feet. .SUNDAY...West winds 10 to 20 knots backing south. A chance of rain showers. Waves calm to 2 feet. .MONDAY...Northwest winds 15 to 25 knots. Rain showers, possibly mixed with snow, then a chance of snow showers. Waves building to 3 to 6 feet occasionally to 8 feet. Note, wave height forecasts are for ice free areas. $$ LSZ266-051045- 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 EST Wed Dec 4 2024 ...STORM WARNING IN EFFECT UNTIL 7 AM EST THURSDAY... ...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH THURSDAY MORNING... ...GALE WARNING IN EFFECT FROM 7 AM EST THURSDAY THROUGH THURSDAY AFTERNOON... .REST OF TONIGHT...North gales to 45 knots increasing to storm force winds to 50 knots by midnight. Heavy freezing spray. Numerous snow showers. Waves 10 to 14 feet occasionally to 18 feet building to 17 to 22 feet occasionally to 28 feet. .THURSDAY...North gales to 45 knots diminishing to winds 20 to 30 knots late. Freezing spray. A chance of snow showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet. .THURSDAY NIGHT...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots by midnight. A chance of snow showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .FRIDAY...West winds 15 to 25 knots veering northwest in the afternoon. A chance of snow showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to 15 knots after midnight. A chance of snow showers. Waves subsiding to calm to 2 feet. .SATURDAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. A chance of snow showers. Waves building to 2 to 4 feet. .SATURDAY NIGHT...Southwest winds 15 to 25 knots. A chance of snow showers. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...West winds 10 to 20 knots backing south. A chance of rain showers. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet. .MONDAY...Northeast winds 15 to 25 knots backing northwest. Snow showers likely. A chance of rain showers. A chance of snow showers. Waves building to 3 to 6 feet occasionally to 8 feet. Note, wave height forecasts are for ice free areas. $$ LSZ267-051045- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 945 PM EST Wed Dec 4 2024 ...GALE WARNING IN EFFECT THROUGH THURSDAY AFTERNOON... .REST OF TONIGHT...Northwest gales to 40 knots veering north by midnight, then increasing to gales to 45 knots with a few storm force gusts to 50 knots possible late. Freezing spray. Numerous snow showers. Waves 9 to 12 feet occasionally to 15 feet building to 15 to 20 feet occasionally to 25 feet. .THURSDAY...North gales to 45 knots. Freezing spray. A slight chance of snow showers. Waves building to 15 to 20 feet occasionally to 25 feet, then subsiding to 8 to 11 feet occasionally to 14 feet. .THURSDAY NIGHT...North winds 20 to 30 knots becoming northwest 15 to 25 knots by midnight. A chance of snow showers in the evening, then snow showers likely after midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .FRIDAY...Northwest winds 15 to 25 knots. Snow showers likely. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .FRIDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A chance of snow showers. Waves subsiding to 1 to 3 feet. .SATURDAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. A chance of snow showers in the morning, then snow showers likely in the afternoon. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .SATURDAY NIGHT...Southwest winds 15 to 25 knots. Snow showers likely in the evening. A chance of rain showers. A chance of snow showers after midnight. Waves building to 2 to 4 feet. .SUNDAY...Southwest winds 10 to 20 knots backing south. A chance of rain showers, then rain showers likely. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .MONDAY...Southeast winds 15 to 25 knots veering northwest. Rain showers likely. Snow showers likely. Waves building to 3 to 5 feet occasionally to 7 feet. Note, wave height forecasts are for ice free areas. $$ LSZ261-051045- MAFOR 0504/ Superior West...STORM WARNING IN EFFECT...11861 19871 11862 12851 11741 11730 12720. Waves 9 to 13 feet overnight. Waves 9 to 12 feet subsiding to 3 to 5 feet Thursday. Waves 2 to 4 feet subsiding to 1 to 3 feet Thursday evening. Superior North Central...STORM WARNING IN EFFECT...11877 12871 11861 11851 11741 11731 11720. Waves 10 to 14 feet building to 13 to 18 feet overnight. Waves 14 to 18 feet subsiding to 7 to 10 feet Thursday. Waves 4 to 7 feet subsiding to 3 to 5 feet Thursday evening. Superior South Central...STORM WARNING IN EFFECT...13877 11861 11851 11841 11741 11720. Waves 11 to 15 feet building to 16 to 21 feet overnight. Waves 16 to 21 feet subsiding to 10 to 13 feet Thursday. Waves 7 to 10 feet subsiding to 4 to 7 feet Thursday evening. Superior East...STORM WARNING IN EFFECT...11867 11871 19877 11871 11861 11851 12841 11730. Waves 10 to 14 feet building to 13 to 17 feet overnight. Waves 13 to 18 feet subsiding to 10 to 13 feet Thursday. Waves 7 to 10 feet subsiding to 5 to 8 feet Thursday evening. $$ TAP Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes