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Great Lakes Forecast
Issued by NWS
Issued by NWS
297 FZUS63 KMQT 031945 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 345 PM EDT Wed Jul 3 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 has made it to the Hudson Bay this afternoon and drags a 29.7 inch trough across Lake Superior. 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 Great Lakes region on Friday. The low continues northeast over the Great Lakes, reaching Quebec by Saturday afternoon. Then a 29.8 inch trough approaches the western Great Lakes on Sunday. LSZ162-040345- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 345 PM EDT Wed Jul 3 2024 /245 PM CDT Wed Jul 3 2024/ .LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TONIGHT...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 in the afternoon, then becoming east 10 to 20 knots late. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Northeast winds 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. .FRIDAY...Northeast winds 10 to 20 knots. A chance of showers. Waves 1 to 3 feet. .FRIDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .SATURDAY...West winds 5 to 15 knots becoming southwest 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southwest winds 10 to 20 knots. Waves calm to 2 feet. .SUNDAY...South winds 10 to 20 knots backing north. A chance of showers. Waves calm to 2 feet. .MONDAY...Southwest winds 10 to 20 knots becoming west 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ263-040345- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 345 PM EDT Wed Jul 3 2024 .LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 2 to 4 feet. .TONIGHT...West winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing south in the afternoon, then backing east late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots backing northeast after midnight. A chance of showers. A slight chance of thunderstorms after midnight. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots. A slight chance of thunderstorms through early afternoon. A chance of showers. Waves building to 1 to 3 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...West winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ264-040345- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 345 PM EDT Wed Jul 3 2024 .LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 3 to 5 feet occasionally to 7 feet subsiding to 2 to 4 feet. .TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots backing southwest late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds less than 10 knots increasing to 5 to 15 knots after midnight. A slight chance of showers 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...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...West winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots veering west. Waves calm to 2 feet. $$ LSZ265-040345- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 345 PM EDT Wed Jul 3 2024 .LATE THIS AFTERNOON...West winds 10 to 20 knots. Isolated showers. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering northeast in the afternoon, then veering east late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. A chance of showers through early afternoon, then showers likely and a slight chance of thunderstorms by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...North winds 10 to 20 knots backing northwest after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...Northwest winds 10 to 20 knots backing west by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots veering west. Waves calm to 2 feet. $$ LSZ266-040345- 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- 345 PM EDT Wed Jul 3 2024 .LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Isolated showers. Waves 2 to 4 feet. .TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering north late. Waves calm to 2 feet. .THURSDAY NIGHT...Northeast winds 5 to 15 knots veering east after midnight, then backing northeast late. 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. A slight chance of thunderstorms by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...North winds 10 to 20 knots. A chance of showers. Waves building to 2 to 4 feet. .SATURDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .SATURDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .SUNDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots veering west. Waves calm to 2 feet. $$ LSZ267-040345- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 345 PM EDT Wed Jul 3 2024 .LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Isolated showers. Waves calm to 2 feet. .TONIGHT...Southwest winds 10 to 20 knots veering west after midnight, then diminishing to 5 to 15 knots late. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots backing west in the afternoon, then veering northwest late. Waves calm to 2 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots veering northeast late. A chance of showers after midnight. Waves calm to 2 feet. .FRIDAY...East winds 10 to 20 knots backing northeast by mid afternoon. Showers likely. A slight chance of thunderstorms by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. A chance of showers. Waves building to 2 to 4 feet. .SATURDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to 3 feet. .SATURDAY NIGHT...West winds 10 to 20 knots backing south after midnight. Waves subsiding to calm to 2 feet. .SUNDAY...Southeast winds 10 to 20 knots veering south. A chance of showers. Waves calm to 2 feet. .MONDAY...Southwest winds 10 to 20 knots becoming west 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ261-040345- MAFOR 0321/ Superior West 11520 12610 14600 11200. Waves 2 to 4 feet subsiding to 1 to 2 feet tonight and Thursday. Superior North Central 11530 11620 11610 12600 11700 12600. Waves 3 to 5 feet subsiding to 1 to 4 feet tonight and Thursday. Superior South Central 12610 11600 11610 11600 11700 11800 11100. Waves 2 feet or less. Superior East 12510 12610 14700. Waves 1 to 2 feet. $$ BW Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes