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Great Lakes Forecast
Issued by NWS
Issued by NWS
743 FZUS63 KMQT 181934 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 334 PM EDT Sun Aug 18 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 29.7 inch low over Georgian Bay will move to Lake Ontario this evening while 30.01 ridging builds over Lake Superior. This ridge will build to 30.2 inches Monday and 30.3 inches Tuesday. Ridging over the Great Lakes weakens to 30.1 inches afterwards into Friday as the high pressure shifts toward the east coast and a 29.8 inch trough moves into northern Ontario. LSZ162-190345- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 334 PM EDT Sun Aug 18 2024 /234 PM CDT Sun Aug 18 2024/ .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots veering northeast late. Waves calm to 2 feet. .MONDAY...Northeast winds 5 to 15 knots becoming east 10 to 20 knots in the afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...East winds 5 to 15 knots backing northeast after midnight. Waves calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .THURSDAY...South winds 10 to 20 knots veering southwest. A chance of showers. Waves building to 1 to 3 feet. .FRIDAY...Southwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ263-190345- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 334 PM EDT Sun Aug 18 2024 .LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots veering northwest after midnight, then veering northeast late. Waves calm to 2 feet. .MONDAY...Northeast winds 5 to 15 knots veering east late. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots diminishing to less than 10 knots late. Waves calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots veering south by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .WEDNESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...South winds 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. .FRIDAY...Southwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ264-190345- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 334 PM EDT Sun Aug 18 2024 .LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots veering north after midnight, then veering northeast late. Waves calm to 2 feet. .MONDAY...Northeast winds 5 to 15 knots backing north late. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY NIGHT...North winds 5 to 15 knots veering east late. Waves calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots veering south by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...South winds less than 10 knots. Waves calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots becoming southwest 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. .FRIDAY...Southwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ265-190345- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 334 PM EDT Sun Aug 18 2024 .LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TONIGHT...Northwest winds 10 to 20 knots veering northeast late. Waves subsiding to calm to 2 feet. .MONDAY...Northeast winds 10 to 20 knots backing north late. Waves building to 1 to 3 feet. .MONDAY NIGHT...North winds 5 to 15 knots veering east late. Waves subsiding to calm to 2 feet. .TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .WEDNESDAY...Southwest winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming southwest 10 to 20 knots after midnight. Waves calm to 2 feet. .THURSDAY...Southeast winds 10 to 20 knots veering south. Waves calm to 2 feet. .FRIDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet. $$ LSZ266-190345- 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- 334 PM EDT Sun Aug 18 2024 .LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 2 to 4 feet. .TONIGHT...North winds 10 to 20 knots veering northeast late. Waves subsiding to 1 to 3 feet. .MONDAY...Northeast winds 10 to 20 knots backing north in the afternoon. Waves building to 2 to 4 feet. .MONDAY NIGHT...North winds 10 to 20 knots veering northeast after midnight, then becoming east 5 to 15 knots late. Waves subsiding to calm to 2 feet. .TUESDAY...East winds 5 to 15 knots backing north by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Northwest winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet. .THURSDAY...South winds 10 to 20 knots. Waves building to 1 to 3 feet. .FRIDAY...South winds 10 to 20 knots veering southwest. Waves subsiding to calm to 2 feet. $$ LSZ267-190345- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 334 PM EDT Sun Aug 18 2024 .LATE THIS AFTERNOON...North winds 15 to 25 knots. Waves 2 to 4 feet. .TONIGHT...North winds 10 to 20 knots veering northeast late. Waves subsiding to 1 to 3 feet. .MONDAY...North winds 15 to 25 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .MONDAY NIGHT...North winds 10 to 20 knots veering northeast after midnight. Waves subsiding to calm to 2 feet. .TUESDAY...Northeast winds 10 to 20 knots backing northwest by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves calm to 2 feet. .WEDNESDAY...Southwest winds 5 to 15 knots veering north by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...South winds 10 to 20 knots. Waves building to 1 to 3 feet. .FRIDAY...South winds 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ261-190345- MAFOR 1821/ Superior West 11500 12600 11400 11100 12110 11210. Waves 2 feet or less. Superior North Central 11610 11710 11810 11100 14110. Waves 1 to 3 feet. Superior South Central 11820 12710 11810 13110 11810. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet Monday. Superior East 11720 11820 11810 11110 12120 12820. Waves 2 to 4 feet. $$ 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