Great Lakes Forecast
Issued by NWS
Issued by NWS
175 FZUS63 KMQT 220131 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 931 PM EDT Fri Jun 21 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 of 30.1 inches resides over Lake Superior this evening. On Saturday, the high will transition to ridging of 30.0 inches extending from northern Ontario across southern Quebec. Meanwhile, a 29.7 low pressure developing over eastern Colorado today will track northeast to Wisconsin by Saturday evening. As the low passes near the Straits of Mackinac Saturday night and reaches southern Quebec on Sunday, it will deepen to 29.5 inches. In its wake, 29.9 inch high pressure building into the Northern Plains on Sunday will settle over the western Great Lakes region on Monday and then the Appalachians on Tuesday. Back to the northwest, 29.3 inch low pressure over Manitoba Monday night will track east toward James Bay on Tuesday, pushing an associated 29.6 inch trough across Lake Superior through Tuesday night. 29.9 inch high pressure extends into the Upper Great Lakes Wednesday from the High Plains LSZ162-220945- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 931 PM EDT Fri Jun 21 2024 /831 PM CDT Fri Jun 21 2024/ .REST OF TONIGHT...Northeast winds 5 to 15 knots veering east after midnight, then becoming northeast 10 to 20 knots late. Scattered showers. Waves calm to 2 feet building to 1 to 3 feet. .SATURDAY...Northeast winds 15 to 25 knots. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SATURDAY NIGHT...Northeast winds 10 to 20 knots becoming north 5 to 15 knots after midnight, then backing west late. A slight chance of thunderstorms through midnight. A chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...West winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southwest after midnight. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves calm to 2 feet. .TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to 15 knots. Waves calm to 2 feet. $$ LSZ263-220945- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 931 PM EDT Fri Jun 21 2024 .REST OF TONIGHT...East winds less than 10 knots increasing to 5 to 15 knots after midnight. Isolated showers after midnight. Waves calm to 2 feet. .SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. A chance of showers. Waves building to 1 to 3 feet. .SATURDAY NIGHT...Northeast winds 5 to 15 knots backing northwest late. A chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...West winds 5 to 15 knots. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight. A chance of showers through midnight, then showers likely and a chance of thunderstorms after midnight. Waves building to 1 to 3 feet. .TUESDAY...Southwest winds 15 to 25 knots veering west. A chance of showers and thunderstorms. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ264-220945- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 931 PM EDT Fri Jun 21 2024 .REST OF TONIGHT...South winds less than 10 knots becoming east 5 to 15 knots late. Isolated showers after midnight. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots backing northeast late. A slight chance of showers. Waves calm to 2 feet. .SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north after midnight. A chance of showers. Waves calm to 2 feet. .SUNDAY...Northwest winds 5 to 15 knots backing west by mid afternoon. A slight chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing south by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight. A chance of showers. Waves building to 1 to 3 feet. .TUESDAY...Southwest winds 15 to 25 knots veering west. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ265-220945- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 931 PM EDT Fri Jun 21 2024 .REST OF TONIGHT...Southeast winds 5 to 15 knots backing east late. Scattered showers after midnight. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots backing northeast late. A chance of showers. Waves calm to 2 feet. .SATURDAY NIGHT...Northeast winds 10 to 20 knots backing northwest late. Showers likely through midnight, then a chance of showers after midnight. Waves calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...West winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TUESDAY...West winds 15 to 25 knots. A chance of showers. Waves calm to 2 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves calm to 2 feet. $$ LSZ266-220945- 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- 931 PM EDT Fri Jun 21 2024 .REST OF TONIGHT...South winds 5 to 15 knots backing east late. Isolated showers after midnight. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots backing northeast in the afternoon. A chance of showers. Waves calm to 2 feet. .SATURDAY NIGHT...Northeast winds 10 to 20 knots becoming north 15 to 25 knots after midnight, then increasing to 20 to 30 knots late. Patchy fog through midnight. A chance of showers. Waves building to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves 1 to 3 feet. .SUNDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves subsiding to calm to 2 feet. .MONDAY...West winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots increasing to 15 to 25 knots after midnight. A chance of showers after midnight. Waves building to 2 to 4 feet. .TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to 20 knots. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ267-220945- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 931 PM EDT Fri Jun 21 2024 .REST OF TONIGHT...Northwest winds 5 to 15 knots veering northeast late. Patchy fog after midnight. Isolated showers after midnight. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots backing northeast in the afternoon, then increasing to 10 to 20 knots late. A chance of showers. Waves calm to 2 feet. .SATURDAY NIGHT...Northeast winds 10 to 20 knots increasing to 15 to 25 knots after midnight, then backing north late. Patchy fog through midnight. Showers likely. Waves building to 1 to 3 feet. .SUNDAY...North winds 10 to 20 knots backing northwest by mid afternoon. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. A chance of showers after midnight. Waves building to 1 to 3 feet. .TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to 20 knots. A chance of showers and thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...Northwest winds 10 to 20 knots veering north. Waves subsiding to calm to 2 feet. $$ LSZ261-220945- MAFOR 2203/ Superior West 11100 11210 11110 19116 14120 11120. Waves 1 foot or less overnight. Waves 1 to 3 feet Saturday and Saturday evening. Superior North Central 11400 11300 11200 12210 13110. A chance of showers Saturday evening. Waves 1 foot or less. Superior South Central 12300 11200 19206 12210 11110 11116 11126. Waves 1 foot or less. Superior East 11800 14100 12110 11120. A chance of showers Saturday and Saturday evening. Waves 1 foot or less. $$ BW Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes