Great Lakes Forecast
Issued by NWS
Issued by NWS
622 FZUS63 KMQT 291957 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 357 PM EDT Sat Jun 29 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 29.6 inch low pressure over northeastern Ontario this afternoon continues east over southern Quebec through this evening while a 30.2 inch high pressure shifts east over the Northern Plains. The high then builds to 30.3 inches as it moves east, reaching the western Great Lakes Sunday morning. As the high weakens to 30.2 inches while moving to the Lower Great Lakes by Monday evening, a 29.5 inch low will develop in the Northern Plains. The low lifts into into northern Ontario by Tuesday evening, pulling a 29.7 inch trough over Lake Superior late Tuesday night through Thursday morning. A 29.8 inch low approaches the Great Lakes from the central Plains on Thursday, deepening to 29.7 inches over the Upper Great Lakes on Friday. LSZ162-300400- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 357 PM EDT Sat Jun 29 2024 /257 PM CDT Sat Jun 29 2024/ .LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. A slight chance of showers and thunderstorms. Waves 2 to 4 feet. .TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .SUNDAY...Northwest winds 5 to 15 knots backing southwest in the afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after midnight. 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...Southeast winds 15 to 25 knots. Showers and a chance of thunderstorms. Waves building to 2 to 4 feet. .TUESDAY...South winds 15 to 25 knots diminishing to 10 to 20 knots by mid afternoon. A chance of showers. Waves subsiding to 1 to 3 feet. .TUESDAY NIGHT...Southwest winds 10 to 20 knots veering west after midnight. A chance of showers. Waves subsiding to calm to 2 feet. .WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots becoming northeast 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ263-300400- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 357 PM EDT Sat Jun 29 2024 .LATE THIS AFTERNOON...North winds 15 to 25 knots. A slight chance of showers. Patchy fog. Waves 2 to 4 feet. .TONIGHT...North winds 15 to 25 knots becoming northwest 5 to 15 knots after midnight. A slight chance of showers through midnight. Waves subsiding to calm to 2 feet. .SUNDAY...Northwest winds 5 to 15 knots backing southwest in the afternoon. Waves building to 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers through midnight, then showers after midnight. Waves building to 2 to 4 feet. .TUESDAY...South winds 15 to 25 knots. A chance of showers. Waves subsiding to 1 to 3 feet. .TUESDAY NIGHT...South winds 5 to 15 knots veering southwest after midnight. A chance of showers. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots backing east. A chance of showers. Waves calm to 2 feet. $$ LSZ264-300400- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 357 PM EDT Sat Jun 29 2024 .LATE THIS AFTERNOON...North winds 15 to 25 knots. A slight chance of showers and thunderstorms. Patchy fog. Waves 3 to 6 feet occasionally to 8 feet. .TONIGHT...North winds 15 to 25 knots becoming northwest 10 to 20 knots after midnight, then diminishing to 5 to 15 knots late. A slight chance of showers through midnight. Waves subsiding to 1 to 3 feet. .SUNDAY...Northwest winds 5 to 15 knots backing west in the afternoon. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .SUNDAY NIGHT...West winds 5 to 15 knots backing southwest late. Waves subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers. Waves building to 2 to 4 feet. .TUESDAY...South winds 15 to 25 knots. Showers likely through early afternoon, then a chance of showers by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest 5 to 15 knots after midnight. A chance of showers. Waves subsiding to 1 to 3 feet. .WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet. .THURSDAY...West winds 5 to 15 knots backing southeast. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ265-300400- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 357 PM EDT Sat Jun 29 2024 .LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. A slight chance of showers. Patchy fog. Waves 2 to 4 feet building to 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 20 to 30 knots diminishing to 10 to 20 knots. A slight chance of showers through midnight. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 2 to 4 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots late. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 15 to 25 knots. A chance of showers after midnight. Waves calm to 2 feet. .TUESDAY...South winds 15 to 25 knots. Showers likely through early afternoon. A chance of showers by mid afternoon. Waves building to 2 to 4 feet. .TUESDAY NIGHT...South winds 15 to 25 knots becoming southwest 10 to 20 knots after midnight. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots veering southeast. A chance of showers. Waves calm to 2 feet. $$ LSZ266-300400- 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- 357 PM EDT Sat Jun 29 2024 .LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Patchy fog. Waves 3 to 6 feet occasionally to 8 feet. .TONIGHT...North winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. A slight chance of showers. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SUNDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to 3 feet. .SUNDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots becoming southeast 10 to 20 knots 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...South winds 20 to 30 knots. Showers likely through early afternoon, then a chance of showers by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Showers likely and a chance of thunderstorms. Waves subsiding to 1 to 3 feet. .WEDNESDAY...West winds 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .THURSDAY...West winds 5 to 15 knots backing southeast. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ267-300400- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 357 PM EDT Sat Jun 29 2024 .LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Patchy fog. Waves 2 to 4 feet building to 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. A slight chance of thunderstorms through midnight. A chance of showers. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 15 to 25 knots backing northwest in the afternoon, then diminishing to 10 to 20 knots late. Waves subsiding to 2 to 4 feet. .SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then backing west late. Waves subsiding to calm to 2 feet. .MONDAY...West winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves building to 1 to 3 feet. .TUESDAY...South winds 15 to 25 knots. Showers likely. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...South winds 15 to 25 knots. Showers and a chance of thunderstorms. Waves subsiding to 1 to 3 feet. .WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing southeast. A chance of showers. Waves calm to 2 feet. $$ LSZ261-300400- MAFOR 2921/ Superior West 11820 12710 13700 11600 11510. Waves 1 to 4 feet. Superior North Central 12830 11720 13710 11600 11610. Waves 3 to 6 feet subsiding to 1 to 4 feet tonight and Sunday. Superior South Central 12740 12730 12720 11710 11700. Waves 3 to 7 through tonight. Waves 1 to 5 feet Sunday. Superior East 11730 11740 12830 12820 12720. A chance of showers this evening. Waves 3 to 7 feet through tonight. Waves 2 to 5 Sunday. $$ Jablonski Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes