Great Lakes Forecast
Issued by NWS
Issued by NWS
881 FZUS63 KMQT 061953 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 353 PM EDT Mon May 6 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 30.1 inch ridge over the Great Lakes slowly drifts eastward and weakens to 29.9 inches tonight while low pressure deepens to 29.1 inches over the Northern Plains. A strong pressure gradient over western Lake Superior begins to set up Tuesday morning as a 29.1 inch low pushes eastward against 30.0 inch ridging over far northern Ontario. This gradient loosens into Wednesday as the Northern Plains low weakens and a 29.5 and a 29.5 inch low ejecting out of the Plains move south of Lake Superior. After a brief window of height rises late in the day Wednesday, another 29.5 inch low moves from the Central Plains into the Lower Great Lakes early Thursday. Weak 30.0 inch ridging briefly builds in Thursday night through early Friday before another 29.7 inch low pressure trough drops through later in the day. This will be followed by weak height rises Saturday as a weak ridge briefly builds to 29.8 inches. LSZ162-070400- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 353 PM EDT Mon May 6 2024 /253 PM CDT Mon May 6 2024/ .LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet. .TONIGHT...East winds 15 to 25 knots diminishing to 10 to 20 knots after midnight, then increasing to 20 to 30 knots late. Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet. .TUESDAY...East winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon, then diminishing to 15 to 25 knots late. A chance of rain showers through early afternoon, then rain showers likely and a slight chance of thunderstorms by mid afternoon. Waves building to 5 to 8 feet occasionally to 10 feet. .TUESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to 10 to 20 knots after midnight, then increasing to 15 to 25 knots late. A slight chance of thunderstorms through midnight. A chance of rain showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY...Northeast winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. A chance of rain showers. Waves building to 4 to 7 feet occasionally to 9 feet. .WEDNESDAY NIGHT...Northeast 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...Northeast winds 15 to 25 knots. Waves subsiding to 2 to 4 feet. .THURSDAY NIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...Southwest winds 10 to 20 knots veering northwest. Waves calm to 2 feet. .SATURDAY...Southwest winds 10 to 20 knots veering west. Waves calm to 2 feet. $$ LSZ263-070400- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 353 PM EDT Mon May 6 2024 .LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to 2 feet building to 1 to 3 feet. .TONIGHT...East winds 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...East winds 10 to 20 knots becoming northeast 15 to 25 knots late. A chance of rain showers. Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 15 to 25 knots by mid afternoon. A chance of rain showers. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .THURSDAY...Northeast winds 15 to 25 knots backing north by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...Southwest winds 5 to 15 knots veering northwest. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ264-070400- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 353 PM EDT Mon May 6 2024 .LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots late. Waves building to 1 to 3 feet. .TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. A slight chance of rain showers by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...East winds 5 to 15 knots becoming northeast 15 to 25 knots late. A chance of rain showers. Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 15 to 25 knots by mid afternoon. A chance of rain showers. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 2 to 4 feet. .WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet. .THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to 20 knots by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...Southwest winds 5 to 15 knots veering north. Waves calm to 2 feet. .SATURDAY...North winds 5 to 15 knots backing west. Waves calm to 2 feet. $$ LSZ265-070400- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 353 PM EDT Mon May 6 2024 .LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...East winds 10 to 20 knots veering southeast after midnight. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TUESDAY...Southeast winds 10 to 20 knots becoming east 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. A chance of rain showers by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .TUESDAY NIGHT...East winds 10 to 20 knots. A chance of rain showers through midnight, then rain showers likely after midnight. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .WEDNESDAY...Northeast winds 10 to 20 knots backing north by mid afternoon. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .WEDNESDAY NIGHT...North winds 10 to 20 knots veering northeast after midnight. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .THURSDAY...North winds 15 to 25 knots. Waves building to 2 to 4 feet. .THURSDAY NIGHT...Northwest winds 10 to 20 knots backing west after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...West winds 10 to 20 knots backing southeast. Waves calm to 2 feet. .SATURDAY...North winds 10 to 20 knots backing west. Waves calm to 2 feet. $$ LSZ266-070400- 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- 353 PM EDT Mon May 6 2024 .LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to 2 feet building to 1 to 3 feet. .TONIGHT...East winds 10 to 20 knots becoming southeast 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .TUESDAY...East winds 10 to 20 knots. A chance of rain showers by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .TUESDAY NIGHT...East winds 10 to 20 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY...Northeast winds 20 to 30 knots becoming north 15 to 25 knots by mid afternoon. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. .WEDNESDAY NIGHT...North winds 15 to 25 knots veering northeast after midnight. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet. .THURSDAY...North winds 15 to 25 knots. Waves subsiding to 2 to 4 feet. .THURSDAY NIGHT...North winds 15 to 25 knots becoming northwest 10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet. .FRIDAY...West winds 10 to 20 knots backing southeast. Waves subsiding to calm to 2 feet. .SATURDAY...North winds 10 to 20 knots backing west. Waves calm to 2 feet. $$ LSZ267-070400- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 353 PM EDT Mon May 6 2024 .LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots becoming southeast 10 to 20 knots after midnight. Waves calm to 2 feet. .TUESDAY...Southeast winds 10 to 20 knots backing east in the afternoon, then becoming southeast 15 to 25 knots late. Waves building to 2 to 4 feet. .TUESDAY NIGHT...Southeast winds 10 to 20 knots backing east after midnight. A chance of rain showers. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .WEDNESDAY...Northeast winds 15 to 25 knots backing north by mid afternoon. A chance of rain showers. Waves subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...North winds 10 to 20 knots becoming northeast 15 to 25 knots after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .THURSDAY...Northeast winds 15 to 25 knots backing north by mid afternoon. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .THURSDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet. .FRIDAY...Northwest winds 10 to 20 knots backing southeast. Waves subsiding to calm to 2 feet. .SATURDAY...North winds 10 to 20 knots backing west. Waves calm to 2 feet. $$ LSZ261-070400- MAFOR 0621/ Superior West 11120 11230 13220 11230 11240 11246. Waves 2 to 4 feet tonight. Waves 3 to 5 feet building to 5 to 8 feet Tuesday. Superior North Central 12220 12320 11310 12220 11230. Waves 1 to 3 feet tonight. Waves 2 to 4 feet building to 3 to 5 feet Tuesday. Superior South Central 12210 14310 11220 11230. Waves 1 to 3 feet tonight. Waves 1 to 3 feet building to 3 to 5 feet Tuesday. Superior East 13200 11300 12310 11320 11220. Waves 1 foot or less tonight. Waves 1 to 3 feet building to 2 to 4 feet Tuesday. $$ LC Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes