Great Lakes Forecast
Issued by NWS
Issued by NWS
665 FZUS63 KMQT 221402 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1002 AM EDT Wed May 22 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 29.2 inch low pressure currently just north of the Minnesota Arrowhead continues north towards James Bay today into tonight as it weakens to 29.4 inches. 29.9 inch ridging builds in Thursday across Lake Superior as the low slowly arrives at James Bay. This ridging shifts east as a 29.6 inch low lifts northeast through the Northern Plains Thursday night into Friday. Weak troughing of 29.8 inches moves over Lake Superior by Saturday. By Sunday, the troughing will move northeast over northern Ontario as another low of 29.4 inches lifts from the Southern Plains towards the Upper Great Lakes. LSZ162-222215- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1002 AM EDT Wed May 22 2024 /902 AM CDT Wed May 22 2024/ ...GALE WARNING IN EFFECT UNTIL 8 PM EDT /7 PM CDT/ THIS EVENING... .REST OF TODAY...Southwest gales to 40 knots veering west in the afternoon. A slight chance of thunderstorms by late morning. A slight chance of showers. Waves 6 to 9 feet occasionally to 11 feet building to 8 to 11 feet occasionally to 14 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. .TONIGHT...West winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .THURSDAY...West winds 15 to 25 knots becoming southwest 10 to 20 knots in the afternoon. Waves subsiding to 1 to 3 feet. .THURSDAY NIGHT...East winds 10 to 20 knots increasing to 15 to 25 knots after midnight. A slight chance of showers and thunderstorms. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .FRIDAY...East winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. A chance of rain showers through early afternoon, then rain showers likely by mid afternoon. Waves building to 4 to 7 feet occasionally to 9 feet. .FRIDAY NIGHT...Northeast winds 20 to 30 knots becoming west 15 to 25 knots after midnight. Rain showers likely through midnight, then a chance of rain showers after midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to 20 knots. A chance of rain showers. Waves subsiding to calm to 2 feet. .SUNDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet. $$ LSZ263-222215- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1002 AM EDT Wed May 22 2024 ...GALE WARNING IN EFFECT THROUGH THIS EVENING... .REST OF TODAY...Southwest gales to 45 knots veering west in the afternoon. A slight chance of showers by mid afternoon. Waves 6 to 9 feet occasionally to 11 feet building to 9 to 12 feet occasionally to 15 feet, then subsiding to 8 to 11 feet occasionally to 14 feet. .TONIGHT...West gales to 35 knots diminishing to 20 to 30 knots after midnight. A slight chance of rain showers through midnight. Waves subsiding to 4 to 7 feet occasionally to 9 feet. .THURSDAY...West winds 15 to 25 knots backing southwest in the afternoon, then diminishing to 10 to 20 knots late. Waves subsiding to 2 to 4 feet. .THURSDAY NIGHT...East winds 5 to 15 knots increasing to 15 to 25 knots after midnight. A slight chance of rain showers through midnight. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 15 to 25 knots. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...East winds 15 to 25 knots veering southwest after midnight. Rain showers likely through midnight. A chance of rain showers after midnight. Waves building to 3 to 6 feet occasionally to 8 feet. .SATURDAY...Southwest winds 15 to 25 knots diminishing to 5 to 15 knots. A chance of rain showers. Waves subsiding to calm to 2 feet. .SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ264-222215- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1002 AM EDT Wed May 22 2024 ...GALE WARNING IN EFFECT THROUGH THIS EVENING... .REST OF TODAY...Southwest gales to 45 knots veering west late. A slight chance of rain showers. Waves 6 to 9 feet occasionally to 11 feet building to 10 to 14 feet occasionally to 18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet. .TONIGHT...West gales to 35 knots diminishing to 20 to 30 knots after midnight. A slight chance of rain showers through midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .THURSDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves subsiding to 2 to 4 feet. .THURSDAY NIGHT...North winds 5 to 15 knots veering northeast after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. A chance of rain showers by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...East winds 15 to 25 knots veering southeast after midnight. Rain showers likely. Waves building to 3 to 5 feet occasionally to 7 feet. .SATURDAY...Southwest winds 15 to 25 knots becoming west 5 to 15 knots. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to calm to 2 feet. .SUNDAY...East winds 5 to 15 knots backing northeast. Waves calm to 2 feet. $$ LSZ265-222215- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1002 AM EDT Wed May 22 2024 ...GALE WARNING IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...Southwest winds 20 to 30 knots veering west late with a few gale force gusts to 35 knots possible. A slight chance of showers. Waves 3 to 6 feet occasionally to 8 feet. .TONIGHT...West winds 20 to 30 knots becoming southwest 15 to 25 knots after midnight, then veering west late. A slight chance of showers through midnight. Waves subsiding to 2 to 4 feet. .THURSDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves subsiding to calm to 2 feet. .THURSDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. A chance of rain showers by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 15 to 25 knots veering south after midnight. Showers likely. Waves building to 1 to 3 feet. .SATURDAY...West winds 15 to 25 knots becoming southwest 10 to 20 knots. A chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...East winds 10 to 20 knots backing northeast. Waves calm to 2 feet. $$ LSZ266-222215- 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- 1002 AM EDT Wed May 22 2024 ...GALE WARNING IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...South winds 20 to 30 knots veering southwest in the afternoon, then veering west late with a few gale force gusts to 35 knots possible. A slight chance of showers. Waves 4 to 8 feet occasionally to 10 feet, then building to 9 to 12 feet occasionally to 15 feet. .TONIGHT...West winds 20 to 30 knots backing southwest after midnight, then veering west late. A slight chance of rain showers through midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .THURSDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves subsiding to 2 to 4 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. A chance of rain showers by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 10 to 20 knots becoming southeast 15 to 25 knots after midnight. Showers. Waves building to 2 to 4 feet. .SATURDAY...West winds 10 to 20 knots backing southwest. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet. .SUNDAY...Northeast winds 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ267-222215- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1002 AM EDT Wed May 22 2024 ...GALE WARNING IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...South winds 20 to 30 knots diminishing to 15 to 25 knots in the afternoon, then becoming west 20 to 30 knots late. A slight chance of showers by mid afternoon. Waves 3 to 6 feet occasionally to 8 feet subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .TONIGHT...West winds 15 to 25 knots backing southwest after midnight. A slight chance of showers through midnight. Waves building to 3 to 6 feet occasionally to 8 feet. .THURSDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves subsiding to 1 to 3 feet. .THURSDAY NIGHT...West winds 10 to 20 knots veering north after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 10 to 20 knots becoming southeast 15 to 25 knots after midnight. A chance of showers through midnight, then showers likely after midnight. Waves building to 2 to 4 feet. .SATURDAY...West winds 10 to 20 knots backing south. A chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet. $$ LSZ261-222215- MAFOR 2215/ Superior West...GALE WARNING IN EFFECT...13650 13640 12630. Waves 7 to 11 feet this afternoon. Waves 6 to 9 feet subsiding to 4 to 7 feet tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Thursday morning. Superior North Central...GALE WARNING IN EFFECT...12550 13650 13640. Waves 6 to 9 feet building to 9 to 13 feet this afternoon. Waves 9 to 13 feet subsiding to 6 to 10 feet tonight. Waves 5 to 9 feet Thursday morning. Superior South Central 11530 13640 12530 12630. Waves 3 to 5 feet subsiding to 2 to 4 feet, then building to 3 to 5 feet this afternoon. Waves 3 to 6 feet subsiding to 2 to 4 feet tonight. Waves 2 to 4 feet Thursday morning. Superior East 11430 11530 12630 12530 11540 11630. Waves 3 to 6 feet this afternoon. Waves 4 to 7 feet tonight and Thursday morning. $$ Jablonski Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes