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Great Lakes Forecast
Issued by NWS
Issued by NWS
485 FZUS63 KMQT 191949 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 349 PM EDT Wed Jun 19 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 30.3 inches over the Northern Plains will build to 30.4 inches as it shifts east, settling over Lake Superior for Thursday and Thursday night. On Friday, 30.3 inch high pressure ridging will extend from Maine to Lake Superior while 29.7 inch low pressure develops over eastern Colorado. This low will track northeast to northern Wisconsin on Saturday as the high pressure ridge drifts northeast. The low will then deepen to 29.4 inches as it tracks across Upper Michigan and southeast Lake Superior during Saturday night and reaches southern Quebec by Sunday evening. 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. LSZ162-200400- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 349 PM EDT Wed Jun 19 2024 /249 PM CDT Wed Jun 19 2024/ .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves 1 to 3 feet subsiding to calm to 2 feet. .TONIGHT...West winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots. A slight chance of showers. Waves calm to 2 feet. .THURSDAY NIGHT...Northeast winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY...Northeast 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. .FRIDAY NIGHT...Northeast winds 10 to 20 knots. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves calm to 2 feet. .SATURDAY...Northeast winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Showers and a chance of thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SATURDAY NIGHT...North winds 10 to 20 knots backing northwest after midnight. A chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming southwest 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ263-200400- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 349 PM EDT Wed Jun 19 2024 .LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 2 to 4 feet. .TONIGHT...West winds 5 to 15 knots becoming north less than 10 knots late. Waves subsiding to calm to 2 feet. .THURSDAY...Northeast winds less than 10 knots increasing to 5 to 15 knots in the afternoon, then veering east late. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots diminishing to less than 10 knots after midnight. A slight chance of showers. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots backing northeast by mid afternoon. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots backing northeast by mid afternoon. Showers and a chance of thunderstorms. Waves building to 1 to 3 feet. .SATURDAY NIGHT...North winds 5 to 15 knots backing northwest after midnight. A chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ264-200400- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 349 PM EDT Wed Jun 19 2024 .LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 3 to 5 feet occasionally to 7 feet subsiding to 2 to 4 feet. .TONIGHT...West winds 5 to 15 knots becoming north less than 10 knots late. Waves subsiding to calm to 2 feet. .THURSDAY...Northeast winds less than 10 knots becoming east 5 to 15 knots in the afternoon, then diminishing to less than 10 knots late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds less than 10 knots. A slight chance of showers after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. A slight chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots. Showers likely. 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 10 to 20 knots becoming west 5 to 15 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots becoming south 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ265-200400- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 349 PM EDT Wed Jun 19 2024 .LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 2 to 4 feet. .TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then veering north late. Waves subsiding to calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots veering east late. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots becoming northeast less than 10 knots after midnight, then veering east late. A slight chance of showers. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers through midnight. Showers likely after midnight. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Showers and a chance of thunderstorms. Waves calm to 2 feet. .SATURDAY NIGHT...North winds 10 to 20 knots backing northwest after midnight. A chance of showers and thunderstorms. Waves calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots backing west. A chance of showers. Waves calm to 2 feet. .MONDAY...Southeast winds 10 to 20 knots veering south. A chance of showers and thunderstorms. Waves calm to 2 feet. $$ LSZ266-200400- 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- 349 PM EDT Wed Jun 19 2024 .LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 4 to 7 feet occasionally to 9 feet subsiding to 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 10 to 20 knots becoming north 5 to 15 knots late. Waves subsiding to calm to 2 feet. .THURSDAY...North winds 5 to 15 knots. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...North winds 5 to 15 knots diminishing to less than 10 knots late. A slight chance of showers. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers through midnight. Showers likely after midnight. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Showers. Waves calm to 2 feet. .SATURDAY NIGHT...Northeast winds 10 to 20 knots backing north after midnight. A chance of showers and thunderstorms. Waves calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY...West winds 10 to 20 knots backing south. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ267-200400- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 349 PM EDT Wed Jun 19 2024 .LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 3 to 6 feet occasionally to 8 feet building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .TONIGHT...West winds 10 to 20 knots veering north late. Waves subsiding to calm to 2 feet. .THURSDAY...North winds 5 to 15 knots increasing to 10 to 20 knots late. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...North winds 5 to 15 knots. A slight chance of showers. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers through midnight, then showers likely after midnight. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots. Showers and a chance of thunderstorms. Waves calm to 2 feet. .SATURDAY NIGHT...East winds 10 to 20 knots backing northwest after midnight. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY...West winds 10 to 20 knots backing south. Waves building to 1 to 3 feet. $$ LSZ261-200400- MAFOR 1921/ Superior West 11620 11610 11600 11700 14100. Waves 1 to 3 feet subsiding to 1 foot or less tonight. Waves 1 foot or less Thursday. Superior North Central 11630 12610 11700 11800 11100 12200. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight. Waves 2 feet or less Thursday. Superior South Central 11630 11620 11610 11700 12800 12100. Waves 2 to 4 feet subsiding to 1 foot or less tonight. Waves 1 foot or less Thursday. Superior East 11730 11720 12710 14800. Waves 4 to 7 feet subsiding to 2 to 3 feet tonight. Waves 1 to 2 feet Thursday. $$ Rolfson Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes