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Great Lakes Forecast
Issued by NWS
Issued by NWS
818 FZUS63 KMQT 022000 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 400 PM EDT Tue Jul 2 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 29.3 inch low shifts east-northeast over far northern Ontario through Wednesday, dragging a 29.7 inch trough across Lake Superior tonight and Wednesday morning as the low continues over Hudson Bay. In its wake, a weak 29.9 inch high pressure ridge will shift east, reaching the western Great Lakes on Thursday. A 29.7 inch low pressure organizing over the Plains on Thursday will then track to the western Great Lakes region on Friday. The low continues northeast over the Great Lakes, reaching Quebec by Saturday evening. Then a 29.8 inch trough approaches the western Great Lakes on Sunday. LSZ162-030400- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 400 PM EDT Tue Jul 2 2024 /300 PM CDT Tue Jul 2 2024/ .LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves 1 to 3 feet. .TONIGHT...South winds 10 to 20 knots veering southwest after midnight. A slight chance of showers and thunderstorms. Patchy fog after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...Southwest winds 15 to 25 knots veering west late. Waves building to 2 to 4 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots late. Waves subsiding to calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots backing northeast after midnight. Waves calm to 2 feet. .FRIDAY...Northeast winds 10 to 20 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...North winds 5 to 15 knots backing northwest after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots veering west. A chance of showers. Waves calm to 2 feet. $$ LSZ263-030400- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 400 PM EDT Tue Jul 2 2024 .LATE THIS AFTERNOON...South winds 15 to 25 knots diminishing to 10 to 20 knots. Waves 2 to 4 feet. .TONIGHT...South winds 10 to 20 knots veering southwest late. A chance of showers and a slight chance of thunderstorms. Patchy fog after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...West winds 15 to 25 knots backing southwest in the afternoon. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing south by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots backing northeast after midnight. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...West winds 5 to 15 knots backing southwest. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ264-030400- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 400 PM EDT Tue Jul 2 2024 .LATE THIS AFTERNOON...South winds 15 to 25 knots. Waves 4 to 7 feet occasionally to 9 feet. .TONIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight, then becoming southwest 5 to 15 knots late. A chance of showers. A slight chance of thunderstorms after midnight. Patchy fog after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...Southwest winds 15 to 25 knots. Waves building to 2 to 4 feet. .WEDNESDAY NIGHT...West winds 15 to 25 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing south by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds less than 10 knots becoming east 5 to 15 knots after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots backing northeast by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...West winds 5 to 15 knots backing southwest. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots veering southwest. Waves calm to 2 feet. $$ LSZ265-030400- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 400 PM EDT Tue Jul 2 2024 .LATE THIS AFTERNOON...South winds 20 to 30 knots. Waves 3 to 5 feet occasionally to 7 feet. .TONIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight, then veering southwest late. A chance of showers. Patchy fog. Waves subsiding to calm to 2 feet. .WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots late. Waves calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots backing east after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots becoming northeast 10 to 20 knots by mid afternoon. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...North winds 10 to 20 knots. A chance of showers. Waves calm to 2 feet. .SATURDAY...Northwest winds 10 to 20 knots becoming south 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots becoming southwest 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ266-030400- 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- 400 PM EDT Tue Jul 2 2024 .LATE THIS AFTERNOON...South winds 20 to 30 knots. Waves 4 to 7 feet occasionally to 9 feet. .TONIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Patchy fog. A chance of showers. Waves subsiding to 1 to 3 feet. .WEDNESDAY...Southwest winds 10 to 20 knots becoming west 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. A slight chance of showers through early afternoon. Waves building to 2 to 4 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots late. Waves subsiding to calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering northeast by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots becoming northeast 10 to 20 knots by mid afternoon. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...North winds 10 to 20 knots. A chance of showers. Waves calm to 2 feet. .SATURDAY...Northwest winds 10 to 20 knots becoming south 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...South winds 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ267-030400- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 400 PM EDT Tue Jul 2 2024 .LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. Scattered showers. Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet. .TONIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots late. Patchy fog. A chance of showers through midnight. Showers after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...Southwest winds 10 to 20 knots veering west in the afternoon. A slight chance of showers through early afternoon. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...Southwest winds 10 to 20 knots veering west after midnight, then diminishing to 5 to 15 knots late. Waves calm to 2 feet. .THURSDAY...West winds 5 to 15 knots veering northwest by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...North winds 5 to 15 knots veering east after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots becoming northeast 10 to 20 knots by mid afternoon. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 10 to 20 knots. A chance of showers. Waves calm to 2 feet. .SATURDAY...Northwest winds 10 to 20 knots backing west. Waves calm to 2 feet. .SUNDAY...South winds 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ261-030400- MAFOR 0221/ Superior West 11420 12410 13520 12530. Waves 2 to 4 feet. Superior North Central 13430 11420 12520 12530. A chance of showers overnight. Waves 4 to 7 feet subsiding to 2 to 4 feet tonight and Wednesday. Superior South Central 12430 11420 11410 11500 11510 12620. A chance of showers tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight and Wednesday. Superior East 11330 11430 12426 11416 12510 11610. Waves 3 to 6 feet subsiding to 1 to 4 feet tonight and Wednesday. $$ Jablonski Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes