Great Lakes Forecast
Issued by NWS
Issued by NWS
319 FZUS63 KMQT 240157 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 957 PM EDT Sun Jun 23 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 29.8 inch ridge continues to shift into the Upper Great Lakes from the west tonight. The high pressure ridge will shift southeast, reaching the Appalachians on Tuesday while building to 30.0 inches. Monday night, a 29.3 inch low will track east through Manitoba, spinning across northern Ontario into James Bay Tuesday at 29.2 inches. This low will support a 29.5 inch trough across Lake Superior Monday night and Tuesday. 29.9 inch high pressure from the High Plains then extends into the Upper Great Lakes Wednesday. This high anchors and builds to 30.0 inches Thursday morning over the Upper Great Lakes. A 29.3 inch low tracks across northern Minnesota on Friday enabling a 29.4 inch trough over western Lake Superior Friday afternoon. LSZ162-241000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 957 PM EDT Sun Jun 23 2024 /857 PM CDT Sun Jun 23 2024/ .REST OF TONIGHT...Southwest winds 5 to 15 knots backing south late. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots backing east in the afternoon. A slight chance of showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southwest late. A chance of showers and thunderstorms. Waves calm to 2 feet. .TUESDAY...Southwest winds 15 to 25 knots becoming west 20 to 30 knots by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming north 10 to 20 knots after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...North winds 10 to 20 knots veering south by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. A chance of thunderstorms. Waves calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots veering west. Showers likely. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ263-241000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 957 PM EDT Sun Jun 23 2024 .REST OF TONIGHT...West winds 5 to 15 knots backing southwest after midnight. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing southeast late. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight, then becoming southwest 10 to 20 knots late. Showers likely and a chance of thunderstorms. Waves building to 1 to 3 feet. .TUESDAY...West winds 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming north 10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...North winds 5 to 15 knots backing southwest by mid afternoon. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...Southwest winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. .FRIDAY...South winds 10 to 20 knots. Showers likely. Waves 1 to 3 feet. $$ LSZ264-241000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 957 PM EDT Sun Jun 23 2024 .REST OF TONIGHT...West winds 5 to 15 knots. Patchy fog after midnight. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing southeast late. Waves calm to 2 feet. .MONDAY NIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots after midnight, then veering southwest late. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves building to 2 to 4 feet. .TUESDAY...West winds 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming north 10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet. .WEDNESDAY...North winds 5 to 15 knots backing northwest by mid afternoon. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...West winds 5 to 15 knots diminishing to less than 10 knots after midnight. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 1 to 3 feet. .FRIDAY...Southeast winds 10 to 20 knots veering south. A chance of showers. Waves building to 2 to 4 feet. $$ LSZ265-241000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 957 PM EDT Sun Jun 23 2024 .REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots becoming southeast 10 to 20 knots in the afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. A slight chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .TUESDAY...West winds 15 to 25 knots. A slight chance of showers and thunderstorms through early afternoon. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest 10 to 20 knots after midnight. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .WEDNESDAY...North winds 10 to 20 knots backing northwest by mid afternoon. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots becoming south 10 to 20 knots. Waves calm to 2 feet. .FRIDAY...Southeast winds 15 to 25 knots veering south. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ266-241000- 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- 957 PM EDT Sun Jun 23 2024 .REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Patchy fog after midnight. Waves 2 to 4 feet subsiding to calm to 2 feet. .MONDAY...West winds 5 to 15 knots backing south in the afternoon, then becoming southeast 10 to 20 knots late. Waves calm to 2 feet. .MONDAY NIGHT...South winds 15 to 25 knots. A slight chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .TUESDAY...Southwest winds 15 to 25 knots veering west by mid afternoon. A slight chance of showers and thunderstorms through early afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...West winds 15 to 25 knots veering northwest after midnight. Waves subsiding to 2 to 4 feet. .WEDNESDAY...North winds 15 to 25 knots becoming northwest 10 to 20 knots by mid afternoon. Waves subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots becoming south 10 to 20 knots. Waves building to 1 to 3 feet. .FRIDAY...South winds 15 to 25 knots. Showers likely. Waves building to 2 to 4 feet. $$ LSZ267-241000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 957 PM EDT Sun Jun 23 2024 .REST OF TONIGHT...Northwest winds 10 to 20 knots backing west after midnight, then diminishing to 5 to 15 knots late. Isolated showers and thunderstorms by late evening. Patchy fog after midnight. Waves 2 to 4 feet subsiding to calm to 2 feet. .MONDAY...West winds 5 to 15 knots backing southwest in the afternoon, then backing east late. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Showers likely and a slight chance of thunderstorms after midnight. Waves building to 2 to 4 feet. .TUESDAY...Southwest winds 15 to 25 knots veering west by mid afternoon. A chance of showers and thunderstorms through early afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .TUESDAY NIGHT...West winds 10 to 20 knots veering northwest after midnight. Waves 2 to 4 feet. .WEDNESDAY...North winds 10 to 20 knots backing northwest by mid afternoon. Waves subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...West winds 5 to 15 knots becoming southeast 10 to 20 knots. Waves calm to 2 feet. .FRIDAY...Southeast winds 15 to 25 knots veering south. A chance of showers, then showers likely. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. $$ LSZ261-241000- MAFOR 2403/ Superior West 12500 13400 11300 12310. A chance of showers and thunderstorms Monday evening. Waves 1 foot or less. Superior North Central 13610 12500 12310 11320. Waves 2 feet or less overnight and Monday. Waves 1 to 3 feet Monday evening. Superior South Central 13600 11500 11300 11310 11320 11420. Waves 2 feet or less overnight and Monday. Waves 1 to 3 feet building to 2 to 4 feet Monday evening. Superior East 12610 12600 11500 11400 11310 11320. Waves 2 to 4 feet overnight. Waves 1 to 3 feet Monday and Monday evening. $$ 07 Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes