Great Lakes Forecast
Issued by NWS
Issued by NWS
504 FZUS63 KMQT 241342 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 942 AM EDT Fri May 24 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 29.9 inch high pressure ridge extending from Ontario to Lower Michigan continues to drift east today, and should be extending from Hudson Bay to the Lower Great Lakes by the evening. Meanwhile, 29.4 inch low pressure currently organizing over the Dakotas will lift northeast, reaching southeast Manitoba tonight. An associated 29.6 inch trough will sweep across Lake Superior during tonight and early Saturday morning. In its wake, a 29.9 inch high pressure will build northeast into the western Great Lakes region on Saturday. The high will shift toward New England on Sunday as the next low pressure of 29.4 inches lifts northeast to southern Wisconsin. This low will deepen to 29.3 inches as it tracks to near the Straits of Mackinac by Monday morning and then to near James Bay by Tuesday morning. In its wake, 30.2 inch high pressure will build over the Plains on Tuesday. LSZ162-242145- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 942 AM EDT Fri May 24 2024 /842 AM CDT Fri May 24 2024/ ...GALE WARNING IN EFFECT UNTIL 8 PM EDT /7 PM CDT/ THIS EVENING... .REST OF TODAY...East gales to 35 knots. A chance of rain showers. A slight chance of thunderstorms by mid afternoon. Waves 5 to 8 feet occasionally to 10 feet building to 9 to 12 feet occasionally to 15 feet. .TONIGHT...East winds 20 to 30 knots becoming southwest 15 to 25 knots after midnight. A chance of showers and thunderstorms through midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet. .SATURDAY...Southwest winds 20 to 30 knots diminishing to 15 to 25 knots in the afternoon. A slight chance of rain showers by mid afternoon. Waves subsiding to 1 to 3 feet. .SATURDAY NIGHT...Southwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A chance of rain showers and a slight chance of thunderstorms. Waves subsiding to calm to 2 feet. .SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. A chance of showers. Waves calm to 2 feet. .SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north after midnight. A chance of showers. Waves calm to 2 feet. .MONDAY...Northwest winds 10 to 20 knots increasing to 15 to 25 knots. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ263-242145- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 942 AM EDT Fri May 24 2024 .REST OF TODAY...East winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon. A chance of rain showers and a slight chance of thunderstorms by mid afternoon. Waves 3 to 5 feet occasionally to 7 feet building to 6 to 9 feet occasionally to 11 feet. .TONIGHT...East winds 20 to 30 knots veering southeast after midnight, then becoming southwest 15 to 25 knots late. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves subsiding to 4 to 8 feet occasionally to 10 feet. .SATURDAY...Southwest winds 15 to 25 knots. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 2 to 4 feet. .SATURDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A slight chance of showers and thunderstorms through midnight. Waves subsiding to calm to 2 feet. .SUNDAY...East winds 5 to 15 knots backing northeast by mid afternoon. A chance of showers by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Northeast winds 5 to 15 knots backing north after midnight. A chance of showers. Waves calm to 2 feet. .MONDAY...Northwest winds 10 to 20 knots increasing to 15 to 25 knots. A chance of showers. Waves building to 2 to 4 feet. .TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ264-242145- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 942 AM EDT Fri May 24 2024 .REST OF TODAY...East winds 5 to 15 knots increasing to 15 to 25 knots in the afternoon. A slight chance of rain showers by mid afternoon. Waves calm to 2 feet building to 3 to 6 feet occasionally to 8 feet. .TONIGHT...East winds 20 to 30 knots becoming southeast 15 to 25 knots after midnight, then veering south late. Showers and a slight chance of thunderstorms. Waves building to 6 to 9 feet occasionally to 11 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. .SATURDAY...Southwest winds 15 to 25 knots becoming south 10 to 20 knots late. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 2 to 4 feet. .SATURDAY NIGHT...South winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .SUNDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Northeast winds 5 to 15 knots. A chance of showers. Waves building to 1 to 3 feet. .MONDAY...North winds 10 to 20 knots backing northwest. A chance of showers. Waves building to 2 to 4 feet. .TUESDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to 3 feet. $$ LSZ265-242145- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 942 AM EDT Fri May 24 2024 .REST OF TODAY...East winds 5 to 15 knots increasing to 15 to 25 knots. A slight chance of rain showers by mid afternoon. Waves calm to 2 feet building to 2 to 4 feet. .TONIGHT...East winds 15 to 25 knots veering southeast after midnight, then veering southwest late. Showers and a slight chance of thunderstorms. Waves building to 3 to 6 feet occasionally to 8 feet. .SATURDAY...West winds 10 to 20 knots backing southwest in the afternoon, then backing southeast late. Waves subsiding to calm to 2 feet. .SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south 5 to 15 knots after midnight. Waves calm to 2 feet. .SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. A chance of showers by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north after midnight. A chance of showers through midnight. Showers likely after midnight. Waves building to 1 to 3 feet. .MONDAY...Northwest winds 15 to 25 knots. A chance of showers. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of rain showers. Waves subsiding to calm to 2 feet. $$ LSZ266-242145- 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- 942 AM EDT Fri May 24 2024 .REST OF TODAY...East winds 5 to 15 knots increasing to 10 to 20 knots late. Waves calm to 2 feet building to 2 to 4 feet. .TONIGHT...East winds 15 to 25 knots veering southeast late. Showers and a slight chance of thunderstorms. Waves building to 4 to 8 feet occasionally to 10 feet. .SATURDAY...West winds 10 to 20 knots backing southwest in the afternoon, then backing southeast late. A chance of rain showers through early afternoon. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves subsiding to calm to 2 feet. .SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...East winds 10 to 20 knots backing northeast after midnight. A chance of showers through midnight. Showers likely after midnight. Waves building to 1 to 3 feet. .MONDAY...North winds 15 to 25 knots backing northwest. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...Northwest winds 15 to 25 knots. A chance of rain showers. Waves subsiding to 2 to 4 feet. $$ LSZ267-242145- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 942 AM EDT Fri May 24 2024 .REST OF TODAY...Northeast winds 5 to 15 knots veering east late. Waves calm to 2 feet. .TONIGHT...East winds 10 to 20 knots becoming southeast 20 to 30 knots after midnight. A chance of showers through midnight, then showers and a slight chance of thunderstorms after midnight. Waves building to 4 to 7 feet occasionally to 9 feet. .SATURDAY...South winds 15 to 25 knots becoming northwest 10 to 20 knots in the afternoon, then backing southeast late. A chance of rain showers and a slight chance of thunderstorms through early afternoon. Waves subsiding to calm to 2 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight. Waves calm to 2 feet. .SUNDAY...Southeast winds 10 to 20 knots backing east by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...East winds 10 to 20 knots. A chance of showers through midnight, then showers likely after midnight. Waves building to 1 to 3 feet. .MONDAY...North winds 15 to 25 knots backing northwest. Showers likely, then a chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...Northwest winds 15 to 25 knots. A chance of rain showers. Waves subsiding to 2 to 4 feet. $$ LSZ261-242145- MAFOR 2415/ Superior West...GALE WARNING IN EFFECT...12250 11256 11246 11330 13530. A chance of thunderstorms this evening. Waves 4 to 7 feet building to 9 to 12 feet this afternoon. Waves 9 to 12 feet subsiding to 4 to 7 feet tonight. Waves 4 to 7 feet Saturday morning. Superior North Central 12220 11230 11240 12346 11430 11530. Waves 1 to 3 feet building to 2 to 4 feet this afternoon. Waves 2 to 4 feet building to 5 to 9 feet tonight. Waves 5 to 8 feet Saturday morning. Superior South Central 11210 12220 11230 12336 11520 11620. Waves 1 to 3 feet this afternoon. Waves 3 to 6 feet tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Saturday morning. Superior East 11200 12210 11220 11230 12336 11520. Waves 1 to 2 feet this afternoon. Waves 1 to 3 feet building to 4 to 7 feet tonight. Waves 4 to 7 feet subsiding to 3 to 5 feet Saturday morning. $$ LC Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes