Great Lakes Forecast
Issued by NWS
Issued by NWS
154 FZUS63 KMQT 171355 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 955 AM EDT Fri May 17 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...As a 29.7 inch low pressure just north of Lake Superior moves east this afternoon, a weak 29.8 inch high pressure ridge will drift across the western Great Lakes. As the ridge builds to 29.9 inches while shifting toward the Lower Great Lakes on Saturday, a 29.3 inch low over southern Manitoba will push an associated 29.6 inch trough eastward to western Lake Superior late in the afternoon. This trough will weaken to 29.9 inches while sailing across the rest of Lake Superior during Saturday night. The parent low pressure that was over southern Manitoba on Saturday will weaken to 29.6 inches as it moves over far northern Ontario during Sunday. To its south, look for a 30.0 inch high pressure ridge to settle over the Upper Great Lakes. As this ridge builds to 30.1 inches while quickly shifting to the Mid-Atlantic Coast on Monday, a 29.8 inch trough will develop northeast to Lake Superior and Upper Michigan. On Tuesday, a 29.4 inch low pressure will track northeast to the Upper Mississippi Valley. LSZ162-172200- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 955 AM EDT Fri May 17 2024 /855 AM CDT Fri May 17 2024/ .REST OF TODAY...South winds 5 to 15 knots backing east in the afternoon, then becoming northeast 10 to 20 knots late. A chance of rain showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet building to 2 to 4 feet. .TONIGHT...Northeast winds 10 to 20 knots. A slight chance of showers and thunderstorms through midnight. Patchy fog after midnight. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .SATURDAY...Northeast winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then backing west late. A chance of rain showers and a slight chance of thunderstorms. Waves building to 1 to 3 feet. .SATURDAY NIGHT...West winds 10 to 20 knots backing southwest after midnight. A slight chance of showers and thunderstorms through midnight. Waves subsiding to calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY NIGHT...South winds 10 to 20 knots backing east after midnight. Showers likely after midnight. Waves calm to 2 feet. .MONDAY...Northeast winds 10 to 20 knots backing north. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TUESDAY...Northeast 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. $$ LSZ263-172200- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 955 AM EDT Fri May 17 2024 .REST OF TODAY...Southwest winds 5 to 15 knots backing south in the afternoon, then backing east late. Patchy fog. A slight chance of rain showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots. A slight chance of showers and thunderstorms through midnight. Waves building to 1 to 3 feet. .SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then veering southwest late. A chance of rain showers and a slight chance of thunderstorms. Waves building to 1 to 3 feet. .SATURDAY NIGHT...West winds 5 to 15 knots backing southwest after midnight. A slight chance of showers and thunderstorms through midnight. Waves 1 to 3 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves 1 to 3 feet. .SUNDAY NIGHT...South winds 5 to 15 knots backing southeast after midnight. A chance of showers. Waves subsiding to calm to 2 feet. .MONDAY...East winds 5 to 15 knots backing northeast. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ264-172200- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 955 AM EDT Fri May 17 2024 .REST OF TODAY...Southwest winds 5 to 15 knots backing southeast late. Patchy fog. A slight chance of rain showers by mid afternoon. Waves 1 to 3 feet subsiding to calm to 2 feet. .TONIGHT...East winds 5 to 15 knots veering southeast late. Patchy fog through midnight. A slight chance of showers and thunderstorms. Waves building to 1 to 3 feet. .SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. A slight chance of showers and thunderstorms by mid afternoon. Waves building to 2 to 4 feet. .SATURDAY NIGHT...Southwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A chance of showers and thunderstorms through midnight. Waves subsiding to 1 to 3 feet. .SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves 1 to 3 feet. .SUNDAY NIGHT...South winds 5 to 15 knots. A chance of showers after midnight. Waves subsiding to calm to 2 feet. .MONDAY...East winds 5 to 15 knots backing northeast. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves building to 2 to 4 feet. $$ LSZ265-172200- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 955 AM EDT Fri May 17 2024 .REST OF TODAY...South winds 5 to 15 knots backing southeast in the afternoon, then becoming east 10 to 20 knots late. Patchy fog through late morning. Waves calm to 2 feet. .TONIGHT...Southeast winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A slight chance of showers and thunderstorms. Waves building to 1 to 3 feet. .SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. A slight chance of showers and thunderstorms by mid afternoon. Waves building to 1 to 3 feet. .SATURDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A chance of showers and thunderstorms through midnight. Waves subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 10 to 20 knots backing southeast after midnight. A chance of showers after midnight. Waves calm to 2 feet. .MONDAY...Southeast winds 10 to 20 knots backing east. Showers likely, then a chance of showers. Waves calm to 2 feet. .TUESDAY...Northeast winds 10 to 20 knots veering east. A chance of showers. Waves calm to 2 feet. $$ LSZ266-172200- 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- 955 AM EDT Fri May 17 2024 ...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON... .REST OF TODAY...Southwest winds 5 to 15 knots backing south in the afternoon, then backing east late. Patchy dense fog through early afternoon. Waves 1 to 3 feet subsiding to calm to 2 feet. .TONIGHT...East winds 10 to 20 knots veering southeast after midnight. A slight chance of rain showers. Waves building to 1 to 3 feet. .SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to 25 knots in the afternoon. A slight chance of showers by mid afternoon. Waves building to 2 to 4 feet. .SATURDAY NIGHT...Southwest winds 10 to 20 knots becoming west 5 to 15 knots after midnight. A chance of showers and thunderstorms. Waves subsiding to 1 to 3 feet. .SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet. .MONDAY...Southeast winds 10 to 20 knots backing east. A chance of rain showers. Waves calm to 2 feet. .TUESDAY...Northeast winds 10 to 20 knots veering east. A chance of showers. Waves building to 2 to 4 feet. $$ LSZ267-172200- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 955 AM EDT Fri May 17 2024 ...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON... .REST OF TODAY...West winds 5 to 15 knots veering north in the afternoon, then veering east late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots veering southeast after midnight, then increasing to 10 to 20 knots late. Waves calm to 2 feet. .SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to 25 knots late. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 10 to 20 knots becoming west 5 to 15 knots after midnight. A chance of showers and thunderstorms. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY...West winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet. .MONDAY...Southeast winds 10 to 20 knots backing east. A chance of showers. Waves calm to 2 feet. .TUESDAY...Northeast winds 10 to 20 knots veering east. A chance of showers. Showers likely. Waves building to 1 to 3 feet. $$ LSZ261-172200- MAFOR 1715/ Superior West 11300 11210 11110 11120 11220 13210. A chance of showers late this morning. A chance of rain showers this evening. Waves calm to 4 feet. Superior North Central 11510 11400 12310 12220 12310. Waves 1 to 3 feet. Superior South Central 11400 19404 12210 12310 13320. Waves 1 to 3 feet. Superior East 11600 19604 11400 12210 14310. Waves 2 feet or less. $$ Rolfson Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes