Great Lakes Forecast
Issued by NWS
Issued by NWS
345 FZUS63 KMQT 161950 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 350 PM EDT Mon Sep 16 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...High pressure at 30.3 inches remains anchored offshore of New England, extending 30.0 inch ridging across the Great Lakes through Wednesday. Meanwhile, a 29.8 inch low drifts northeast across northern Ontario on Tuesday, reaching northern Quebec by Wednesday morning. At the same time, a 29.4 inch trough emerges from the western Plains on Tuesday. Low pressure of 29.3 inches developing along this trough Tuesday night and Wednesday will lift into Saskatchewan Wednesday night. As the low drifts northeast to Manitoba on Thursday, an associated 29.7 inch trough will progress across the Dakotas. As the low continues to track northeast to Hudson Bay on Friday, the associated trough will reach western Lake Superior and then dissipate. Meanwhile, weak 29.9 to 30.0 inch ridging extends from northern Quebec into the Great Lakes region on Thursday and Friday. High pressure ridging looks to rise to 30.1 inches over the Great Lakes on Saturday. LSZ162-170400- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 350 PM EDT Mon Sep 16 2024 /250 PM CDT Mon Sep 16 2024/ .LATE THIS AFTERNOON...East winds 5 to 15 knots. Isolated showers and thunderstorms. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots veering south after midnight. Patchy fog through midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing east late. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 5 to 15 knots. A slight chance of showers. A slight chance of thunderstorms 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...East winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. Showers likely. Waves calm to 2 feet. .FRIDAY...Southwest winds 10 to 20 knots becoming west 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots becoming northeast 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ263-170400- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 350 PM EDT Mon Sep 16 2024 .LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots veering south after midnight. A slight chance of showers and thunderstorms through midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 5 to 15 knots. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. A chance of showers. Waves calm to 2 feet. .FRIDAY...South winds 5 to 15 knots veering southwest. A chance of showers. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots backing southeast. A chance of showers. Waves calm to 2 feet. $$ LSZ264-170400- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 350 PM EDT Mon Sep 16 2024 .LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots veering south after midnight. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 5 to 15 knots veering southwest late. A slight chance of showers. A slight chance of thunderstorms after midnight. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots backing southeast 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...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots becoming south 5 to 15 knots after midnight. Waves building to 1 to 3 feet. .FRIDAY...South winds 5 to 15 knots. A chance of showers. Waves subsiding to calm to 2 feet. .SATURDAY...South winds 5 to 15 knots backing southeast. A chance of showers. Waves calm to 2 feet. $$ LSZ265-170400- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 350 PM EDT Mon Sep 16 2024 .LATE THIS AFTERNOON...East winds 5 to 15 knots. A chance of showers and isolated thunderstorms. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots veering south after midnight. A slight chance of showers and thunderstorms through midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest 5 to 15 knots late. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots becoming south 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots becoming southeast 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ266-170400- 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- 350 PM EDT Mon Sep 16 2024 .LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Scattered showers and isolated thunderstorms. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots. A slight chance of showers and thunderstorms. Waves building to 1 to 3 feet. .TUESDAY...South winds 5 to 15 knots increasing to 10 to 20 knots late. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .TUESDAY NIGHT...South winds 10 to 20 knots. A slight chance of showers after midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ267-170400- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 350 PM EDT Mon Sep 16 2024 .LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to 15 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots veering south. A chance of showers. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ261-170400- MAFOR 1621/ Superior West 12300 14410 11410 11400. Waves 2 feet or less. Superior North Central 11410 11300 15410. Waves 2 feet or less. Superior South Central 11300 11310 15410. A chance of showers this evening. Waves 2 feet or less. Superior East 11300 11310 15410. Waves 1 to 3 feet. $$ Jablonski Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes