Great Lakes Forecast
Issued by NWS
Issued by NWS
538 FZUS63 KMQT 111959 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 359 PM EDT Sat May 11 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...Tonight, Lake Superior will be under weak surface ridging of 29.8 inches relative to a 29.7 inch low pressure over southern Ontario and a 29.4 inch low over far northwestern Ontario. As the southern low dissipates Sunday, the northwestern low will weaken slightly as it moves north of Lake Superior at 29.5 inches. The low will slowly shift east, weakening to 29.6 inches over James Bay Monday morning. Tuesday into Wednesday, high pressure of 30.1 inches slowly builds over northern Ontario as lows of 29.7 inches move over the Dakotas and Virginias respectively. By late Thursday, the low over the Daktoas will approach the Upper Great Lakes, maintaining pressure at 29.7 inches. LSZ162-120400- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 359 PM EDT Sat May 11 2024 /259 PM CDT Sat May 11 2024/ .LATE THIS AFTERNOON...South winds 5 to 15 knots. A chance of rain showers. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots late. A chance of rain showers. A slight chance of thunderstorms after midnight. Waves building to 1 to 3 feet. .SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then veering west late. A slight chance of rain showers through early afternoon. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...Northwest winds 5 to 15 knots increasing to 10 to 20 knots after midnight, then veering north late. Waves calm to 2 feet. .MONDAY...North winds 10 to 20 knots veering south by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Northeast winds 10 to 20 knots. Waves calm to 2 feet. .TUESDAY...Northeast winds 10 to 20 knots veering east by mid afternoon. Waves building to 2 to 4 feet. .TUESDAY NIGHT...Northeast winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .WEDNESDAY...East winds 10 to 20 knots backing northeast. Rain showers likely. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .THURSDAY...South winds 10 to 20 knots backing northeast. A chance of rain showers. Waves calm to 2 feet. $$ LSZ263-120400- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 359 PM EDT Sat May 11 2024 .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A chance of rain showers. A slight chance of thunderstorms after midnight. Waves building to 2 to 4 feet. .SUNDAY...Southwest winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon. A slight chance of showers and thunderstorms through early afternoon. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots veering north after midnight, then increasing to 10 to 20 knots late. Waves calm to 2 feet. .MONDAY...North winds 10 to 20 knots becoming southwest 5 to 15 knots by mid afternoon. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots becoming northeast 10 to 20 knots after midnight. Waves building to 1 to 3 feet. .TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to 15 knots by mid afternoon. Waves subsiding to calm to 2 feet. .TUESDAY NIGHT...Northeast winds 5 to 15 knots veering east after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ264-120400- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 359 PM EDT Sat May 11 2024 .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots backing south after midnight, then increasing to 10 to 20 knots late. A chance of rain showers. A slight chance of thunderstorms after midnight. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY...South winds 10 to 20 knots becoming southwest 5 to 15 knots in the afternoon. A slight chance of rain showers through early afternoon. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots veering north after midnight, then increasing to 10 to 20 knots late. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .MONDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...North winds 10 to 20 knots. Waves building to 1 to 3 feet. .TUESDAY...North winds 10 to 20 knots becoming west 5 to 15 knots by mid afternoon. Waves subsiding to calm to 2 feet. .TUESDAY NIGHT...Northwest winds 5 to 15 knots veering northeast after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots veering southeast. A chance of rain showers. Waves building to 1 to 3 feet. .THURSDAY...Southeast winds 10 to 20 knots becoming south 5 to 15 knots. A chance of rain showers. Waves subsiding to calm to 2 feet. $$ LSZ265-120400- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 359 PM EDT Sat May 11 2024 .LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots backing south after midnight, then increasing to 10 to 20 knots late. A chance of rain showers after midnight. Waves building to 1 to 3 feet. .SUNDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots late. A slight chance of showers and thunderstorms. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SUNDAY NIGHT...South winds 5 to 15 knots becoming northwest 10 to 20 knots after midnight. Waves calm to 2 feet. .MONDAY...Northwest winds 10 to 20 knots veering north by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots becoming north 10 to 20 knots after midnight. Waves calm to 2 feet. .TUESDAY...North winds 10 to 20 knots. Waves calm to 2 feet. .TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to 20 knots. A chance of rain showers. Waves calm to 2 feet. .THURSDAY...Southeast winds 10 to 20 knots veering south. A chance of rain showers. Waves calm to 2 feet. $$ LSZ266-120400- 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 EDT Sat May 11 2024 .LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots backing south after midnight, then increasing to 10 to 20 knots late. A chance of rain showers after midnight. Waves building to 2 to 4 feet. .SUNDAY...South winds 15 to 25 knots diminishing to 5 to 15 knots late. A chance of rain showers and a slight chance of thunderstorms. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet. .SUNDAY NIGHT...South winds 5 to 15 knots becoming west 10 to 20 knots after midnight, then veering northwest late. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .MONDAY...Northwest winds 10 to 20 knots. Waves 1 to 3 feet. .MONDAY NIGHT...Northwest winds 10 to 20 knots veering north after midnight. Waves 1 to 3 feet. .TUESDAY...North winds 10 to 20 knots backing northwest by mid afternoon. Waves 1 to 3 feet. .TUESDAY NIGHT...North winds 10 to 20 knots veering northeast after midnight. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .WEDNESDAY...Northeast winds 10 to 20 knots veering southeast. Waves calm to 2 feet. .THURSDAY...Southeast winds 15 to 25 knots becoming south 10 to 20 knots. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ267-120400- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 359 PM EDT Sat May 11 2024 .LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 1 to 3 feet. .TONIGHT...West winds 5 to 15 knots backing south late. A slight chance of rain showers after midnight. Waves subsiding to calm to 2 feet. .SUNDAY...South winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. A chance of rain showers. A slight chance of thunderstorms by mid afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SUNDAY NIGHT...South winds 10 to 20 knots veering southwest after midnight, then becoming northwest 5 to 15 knots late. Waves subsiding to calm to 2 feet. .MONDAY...Northwest winds 10 to 20 knots. Waves building to 1 to 3 feet. .MONDAY NIGHT...Northwest winds 10 to 20 knots veering north after midnight. Waves 1 to 3 feet. .TUESDAY...North winds 10 to 20 knots becoming northwest 15 to 25 knots by mid afternoon. Waves building to 2 to 4 feet. .TUESDAY NIGHT...North winds 10 to 20 knots veering northeast after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...North winds 10 to 20 knots veering southeast. Waves calm to 2 feet. .THURSDAY...Southeast winds 10 to 20 knots. A chance of rain showers. Waves calm to 2 feet. $$ LSZ261-120400- MAFOR 1121/ Superior West 13410 12420 13510. A chance of showers tonight. Waves 1 to 4 feet. Superior North Central 11620 11520 11510 12420 11430 11420 11510. A chance of rain showers overnight and Sunday morning. Waves 1 to 4 feet. Superior South Central 12600 11500 11410 11420 12430 11410. A chance of rain showers overnight and Sunday morning. Waves 2 feet or less tonight. Waves 1 to 4 feet Sunday. Superior East 12710 11600 11400 11410 12430 11420. A chance of rain showers Sunday. Waves 1 to 3 feet tonight building to 3 to 5 feet Sunday. $$ GS Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes